revise wording for non-default sighash warnings

* improve calculation of Taproot tweaked output key

* add BIP341 test vectors for taproot key tweaking

* simplify and use helper methods as proposed in PR review

README.md

@@ -6,7 +6,7 @@ Drongo is a Java Bitcoin library built mainly to support [Sparrow Wallet](https:
 
 Drongo can be built with
 
-`./gradlew shadowJar`
+`./gradlew jar`
 
 ## License
 

build.gradle

@@ -1,14 +1,5 @@
-buildscript {
-    repositories {
-        maven {
-            url "https://plugins.gradle.org/m2/"
-        }
-    }
-}
-
 plugins {
     id 'java-library'
-    id 'extra-java-module-info'
 }
 
 tasks.withType(AbstractArchiveTask) {
@@ -27,41 +18,28 @@ repositories {
 }
 
 dependencies {
-    implementation ('com.googlecode.json-simple:json-simple:1.1.1') {
-        exclude group: 'junit', module: 'junit'
+    implementation ('org.bouncycastle:bcprov-jdk18on:1.82')
+    implementation('org.pgpainless:pgpainless-core:1.7.7') {
+        exclude group: 'org.jetbrains.kotlin', module: 'kotlin-stdlib-common'
     }
-    implementation ('org.bouncycastle:bcprov-jdk18on:1.77')
-    implementation('org.pgpainless:pgpainless-core:1.6.7')
-    implementation ('de.mkammerer:argon2-jvm:2.11') {
+    implementation ('de.mkammerer:argon2-jvm:2.12') {
         exclude group: 'net.java.dev.jna', module: 'jna'
     }
-    implementation ('net.java.dev.jna:jna:5.8.0')
-    implementation ('ch.qos.logback:logback-classic:1.4.14') {
+    implementation('dnsjava:dnsjava:3.6.4')
+    implementation('com.github.ben-manes.caffeine:caffeine:3.2.3')
+    implementation ('net.java.dev.jna:jna:5.18.1')
+    implementation ('ch.qos.logback:logback-classic:1.5.32') {
         exclude group: 'org.slf4j'
     }
-    implementation ('org.slf4j:slf4j-api:2.0.12')
-    testImplementation('org.junit.jupiter:junit-jupiter-api:5.10.0')
-    testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.10.0')
+    implementation ('org.slf4j:slf4j-api:2.0.17')
+    testImplementation('org.junit.jupiter:junit-jupiter-api:5.14.1')
+    testRuntimeOnly('org.junit.jupiter:junit-jupiter-engine:5.14.1')
     testRuntimeOnly('org.junit.platform:junit-platform-launcher')
 }
 
 test {
     useJUnitPlatform()
+    jvmArgs = ["--enable-native-access=ALL-UNNAMED"]
 }
 
-processResources {
-    doLast {
-        delete fileTree("$buildDir/resources/main/native").matching {
-            exclude "${osName}/**"
-        }
-    }
-}
 
-extraJavaModuleInfo {
-    module('json-simple-1.1.1.jar', 'json.simple', '1.1.1') {
-        exports('org.json.simple')
-        exports('org.json.simple.parser')
-    }
-    module('jnacl-1.0.0.jar', 'eu.neilalexander.jnacl', '1.0.0')
-    module('jsr305-3.0.2.jar', 'com.google.code.findbugs.jsr305', '3.0.2')
-}

buildSrc/build.gradle

@@ -1,21 +0,0 @@
-plugins {
-    id 'java-gradle-plugin' // so we can assign and ID to our plugin
-}
-
-dependencies {
-    implementation 'org.ow2.asm:asm:8.0.1'
-}
-
-repositories {
-    mavenCentral()
-}
-
-gradlePlugin {
-    plugins {
-        // here we register our plugin with an ID
-        register("extra-java-module-info") {
-            id = "extra-java-module-info"
-            implementationClass = "org.gradle.sample.transform.javamodules.ExtraModuleInfoPlugin"
-        }
-    }
-}

buildSrc/src/main/java/org/gradle/sample/transform/javamodules/ExtraModuleInfoPlugin.java

@@ -1,54 +0,0 @@
-package org.gradle.sample.transform.javamodules;
-
-import org.gradle.api.Plugin;
-import org.gradle.api.Project;
-import org.gradle.api.artifacts.Configuration;
-import org.gradle.api.attributes.Attribute;
-import org.gradle.api.plugins.JavaPlugin;
-
-/**
- * Entry point of our plugin that should be applied in the root project.
- */
-public class ExtraModuleInfoPlugin implements Plugin<Project> {
-
-    @Override
-    public void apply(Project project) {
-        // register the plugin extension as 'extraJavaModuleInfo {}' configuration block
-        ExtraModuleInfoPluginExtension extension = project.getObjects().newInstance(ExtraModuleInfoPluginExtension.class);
-        project.getExtensions().add(ExtraModuleInfoPluginExtension.class, "extraJavaModuleInfo", extension);
-
-        // setup the transform for all projects in the build
-        project.getPlugins().withType(JavaPlugin.class).configureEach(javaPlugin -> configureTransform(project, extension));
-    }
-
-    private void configureTransform(Project project, ExtraModuleInfoPluginExtension extension) {
-        Attribute<String> artifactType = Attribute.of("artifactType", String.class);
-        Attribute<Boolean> javaModule = Attribute.of("javaModule", Boolean.class);
-
-        // compile and runtime classpath express that they only accept modules by requesting the javaModule=true attribute
-        project.getConfigurations().matching(this::isResolvingJavaPluginConfiguration).all(
-                c -> c.getAttributes().attribute(javaModule, true));
-
-        // all Jars have a javaModule=false attribute by default; the transform also recognizes modules and returns them without modification
-        project.getDependencies().getArtifactTypes().getByName("jar").getAttributes().attribute(javaModule, false);
-
-        // register the transform for Jars and "javaModule=false -> javaModule=true"; the plugin extension object fills the input parameter
-        project.getDependencies().registerTransform(ExtraModuleInfoTransform.class, t -> {
-            t.parameters(p -> {
-                p.setModuleInfo(extension.getModuleInfo());
-                p.setAutomaticModules(extension.getAutomaticModules());
-            });
-            t.getFrom().attribute(artifactType, "jar").attribute(javaModule, false);
-            t.getTo().attribute(artifactType, "jar").attribute(javaModule, true);
-        });
-    }
-
-    private boolean isResolvingJavaPluginConfiguration(Configuration configuration) {
-        if (!configuration.isCanBeResolved()) {
-            return false;
-        }
-        return configuration.getName().endsWith(JavaPlugin.COMPILE_CLASSPATH_CONFIGURATION_NAME.substring(1))
-                || configuration.getName().endsWith(JavaPlugin.RUNTIME_CLASSPATH_CONFIGURATION_NAME.substring(1))
-                || configuration.getName().endsWith(JavaPlugin.ANNOTATION_PROCESSOR_CONFIGURATION_NAME.substring(1));
-    }
-}

buildSrc/src/main/java/org/gradle/sample/transform/javamodules/ExtraModuleInfoPluginExtension.java

@@ -1,52 +0,0 @@
-package org.gradle.sample.transform.javamodules;
-
-
-import org.gradle.api.Action;
-
-import javax.annotation.Nullable;
-import java.util.HashMap;
-import java.util.Map;
-
-/**
- * A data class to collect all the module information we want to add.
- * Here the class is used as extension that can be configured in the build script
- * and as input to the ExtraModuleInfoTransform that add the information to Jars.
- */
-public class ExtraModuleInfoPluginExtension {
-
-    private final Map<String, ModuleInfo> moduleInfo = new HashMap<>();
-    private final Map<String, String> automaticModules = new HashMap<>();
-
-    /**
-     * Add full module information for a given Jar file.
-     */
-    public void module(String jarName, String moduleName, String moduleVersion) {
-        module(jarName, moduleName, moduleVersion, null);
-    }
-
-    /**
-     * Add full module information, including exported packages and dependencies, for a given Jar file.
-     */
-    public void module(String jarName, String moduleName, String moduleVersion, @Nullable Action<? super ModuleInfo> conf) {
-        ModuleInfo moduleInfo = new ModuleInfo(moduleName, moduleVersion);
-        if (conf != null) {
-            conf.execute(moduleInfo);
-        }
-        this.moduleInfo.put(jarName, moduleInfo);
-    }
-
-    /**
-     * Add only an automatic module name to a given jar file.
-     */
-    public void automaticModule(String jarName, String moduleName) {
-        automaticModules.put(jarName, moduleName);
-    }
-
-    protected Map<String, ModuleInfo> getModuleInfo() {
-        return moduleInfo;
-    }
-
-    protected Map<String, String> getAutomaticModules() {
-        return automaticModules;
-    }
-}

buildSrc/src/main/java/org/gradle/sample/transform/javamodules/ExtraModuleInfoTransform.java

@@ -1,164 +0,0 @@
-package org.gradle.sample.transform.javamodules;
-
-import org.gradle.api.artifacts.transform.InputArtifact;
-import org.gradle.api.artifacts.transform.TransformAction;
-import org.gradle.api.artifacts.transform.TransformOutputs;
-import org.gradle.api.artifacts.transform.TransformParameters;
-import org.gradle.api.file.FileSystemLocation;
-import org.gradle.api.provider.Provider;
-import org.gradle.api.tasks.Input;
-import org.objectweb.asm.ClassWriter;
-import org.objectweb.asm.ModuleVisitor;
-import org.objectweb.asm.Opcodes;
-
-import java.io.*;
-import java.util.Collections;
-import java.util.Map;
-import java.util.jar.*;
-import java.util.regex.Pattern;
-import java.util.zip.ZipEntry;
-
-/**
- * An artifact transform that applies additional information to Jars without module information.
- * The transformation fails the build if a Jar does not contain information and no extra information
- * was defined for it. This way we make sure that all Jars are turned into modules.
- */
-abstract public class ExtraModuleInfoTransform implements TransformAction<ExtraModuleInfoTransform.Parameter> {
-
-    public static class Parameter implements TransformParameters, Serializable {
-        private Map<String, ModuleInfo> moduleInfo = Collections.emptyMap();
-        private Map<String, String> automaticModules = Collections.emptyMap();
-
-        @Input
-        public Map<String, ModuleInfo> getModuleInfo() {
-            return moduleInfo;
-        }
-
-        @Input
-        public Map<String, String> getAutomaticModules() {
-            return automaticModules;
-        }
-
-        public void setModuleInfo(Map<String, ModuleInfo> moduleInfo) {
-            this.moduleInfo = moduleInfo;
-        }
-
-        public void setAutomaticModules(Map<String, String> automaticModules) {
-            this.automaticModules = automaticModules;
-        }
-    }
-
-    @InputArtifact
-    protected abstract Provider<FileSystemLocation> getInputArtifact();
-
-    @Override
-    public void transform(TransformOutputs outputs) {
-        Map<String, ModuleInfo> moduleInfo = getParameters().moduleInfo;
-        Map<String, String> automaticModules = getParameters().automaticModules;
-        File originalJar = getInputArtifact().get().getAsFile();
-        String originalJarName = originalJar.getName();
-
-        if (isModule(originalJar)) {
-            outputs.file(originalJar);
-        } else if (moduleInfo.containsKey(originalJarName)) {
-            addModuleDescriptor(originalJar, getModuleJar(outputs, originalJar), moduleInfo.get(originalJarName));
-        } else if (isAutoModule(originalJar)) {
-            outputs.file(originalJar);
-        } else if (automaticModules.containsKey(originalJarName)) {
-            addAutomaticModuleName(originalJar,  getModuleJar(outputs, originalJar), automaticModules.get(originalJarName));
-        } else {
-            throw new RuntimeException("Not a module and no mapping defined: " + originalJarName);
-        }
-    }
-
-    private boolean isModule(File jar) {
-        Pattern moduleInfoClassMrjarPath = Pattern.compile("META-INF/versions/\\d+/module-info.class");
-        try (JarInputStream inputStream =  new JarInputStream(new FileInputStream(jar))) {
-            boolean isMultiReleaseJar = containsMultiReleaseJarEntry(inputStream);
-            ZipEntry next = inputStream.getNextEntry();
-            while (next != null) {
-                if ("module-info.class".equals(next.getName())) {
-                    return true;
-                }
-                if (isMultiReleaseJar && moduleInfoClassMrjarPath.matcher(next.getName()).matches()) {
-                    return true;
-                }
-                next = inputStream.getNextEntry();
-            }
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-        return false;
-    }
-
-    private boolean containsMultiReleaseJarEntry(JarInputStream jarStream) {
-        Manifest manifest = jarStream.getManifest();
-        return manifest != null && Boolean.parseBoolean(manifest.getMainAttributes().getValue("Multi-Release"));
-    }
-
-    private boolean isAutoModule(File jar) {
-        try (JarInputStream inputStream = new JarInputStream(new FileInputStream(jar))) {
-            return inputStream.getManifest().getMainAttributes().getValue("Automatic-Module-Name") != null;
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    private File getModuleJar(TransformOutputs outputs, File originalJar) {
-        return outputs.file(originalJar.getName().substring(0, originalJar.getName().lastIndexOf('.')) + "-module.jar");
-    }
-
-    private static void addAutomaticModuleName(File originalJar, File moduleJar, String moduleName) {
-        try (JarInputStream inputStream = new JarInputStream(new FileInputStream(originalJar))) {
-            Manifest manifest = inputStream.getManifest();
-            manifest.getMainAttributes().put(new Attributes.Name("Automatic-Module-Name"), moduleName);
-            try (JarOutputStream outputStream = new JarOutputStream(new FileOutputStream(moduleJar), inputStream.getManifest())) {
-                copyEntries(inputStream, outputStream);
-            }
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    private static void addModuleDescriptor(File originalJar, File moduleJar, ModuleInfo moduleInfo) {
-        try (JarInputStream inputStream = new JarInputStream(new FileInputStream(originalJar))) {
-            try (JarOutputStream outputStream = new JarOutputStream(new FileOutputStream(moduleJar), inputStream.getManifest())) {
-                copyEntries(inputStream, outputStream);
-                outputStream.putNextEntry(new JarEntry("module-info.class"));
-                outputStream.write(addModuleInfo(moduleInfo));
-                outputStream.closeEntry();
-            }
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
-    }
-
-    private static void copyEntries(JarInputStream inputStream, JarOutputStream outputStream) throws IOException {
-        JarEntry jarEntry = inputStream.getNextJarEntry();
-        while (jarEntry != null) {
-            outputStream.putNextEntry(jarEntry);
-            outputStream.write(inputStream.readAllBytes());
-            outputStream.closeEntry();
-            jarEntry = inputStream.getNextJarEntry();
-        }
-    }
-
-    private static byte[] addModuleInfo(ModuleInfo moduleInfo) {
-        ClassWriter classWriter = new ClassWriter(0);
-        classWriter.visit(Opcodes.V9, Opcodes.ACC_MODULE, "module-info", null, null, null);
-        ModuleVisitor moduleVisitor = classWriter.visitModule(moduleInfo.getModuleName(), Opcodes.ACC_OPEN, moduleInfo.getModuleVersion());
-        for (String packageName : moduleInfo.getExports()) {
-            moduleVisitor.visitExport(packageName.replace('.', '/'), 0);
-        }
-        moduleVisitor.visitRequire("java.base", 0, null);
-        for (String requireName : moduleInfo.getRequires()) {
-            moduleVisitor.visitRequire(requireName, 0, null);
-        }
-        for (String requireName : moduleInfo.getRequiresTransitive()) {
-            moduleVisitor.visitRequire(requireName, Opcodes.ACC_TRANSITIVE, null);
-        }
-        moduleVisitor.visitEnd();
-        classWriter.visitEnd();
-        return classWriter.toByteArray();
-    }
-}

buildSrc/src/main/java/org/gradle/sample/transform/javamodules/ModuleInfo.java

@@ -1,53 +0,0 @@
-package org.gradle.sample.transform.javamodules;
-
-import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Data class to hold the information that should be added as module-info.class to an existing Jar file.
- */
-public class ModuleInfo implements Serializable {
-    private String moduleName;
-    private String moduleVersion;
-    private List<String> exports = new ArrayList<>();
-    private List<String> requires = new ArrayList<>();
-    private List<String> requiresTransitive = new ArrayList<>();
-
-    ModuleInfo(String moduleName, String moduleVersion) {
-        this.moduleName = moduleName;
-        this.moduleVersion = moduleVersion;
-    }
-
-    public void exports(String exports) {
-        this.exports.add(exports);
-    }
-
-    public void requires(String requires) {
-        this.requires.add(requires);
-    }
-
-    public void requiresTransitive(String requiresTransitive) {
-        this.requiresTransitive.add(requiresTransitive);
-    }
-
-    public String getModuleName() {
-        return moduleName;
-    }
-
-    protected String getModuleVersion() {
-        return moduleVersion;
-    }
-
-    protected List<String> getExports() {
-        return exports;
-    }
-
-    protected List<String> getRequires() {
-        return requires;
-    }
-
-    protected List<String> getRequiresTransitive() {
-        return requiresTransitive;
-    }
-}

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

gradlew

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 #
-# Copyright © 2015-2021 the original authors.
+# Copyright © 2015 the original authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+# SPDX-License-Identifier: Apache-2.0
+#
 
 ##############################################################################
 #
@@ -55,7 +57,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
@@ -84,7 +86,7 @@ done
 # shellcheck disable=SC2034
 APP_BASE_NAME=${0##*/}
 # Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
-APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
 
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
@@ -112,7 +114,6 @@ case "$( uname )" in                #(
   NONSTOP* )        nonstop=true ;;
 esac
 
-CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
 
 
 # Determine the Java command to use to start the JVM.
@@ -170,7 +171,6 @@ fi
 # For Cygwin or MSYS, switch paths to Windows format before running java
 if "$cygwin" || "$msys" ; then
     APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
-    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
 
     JAVACMD=$( cygpath --unix "$JAVACMD" )
 
@@ -203,15 +203,14 @@ fi
 DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
 
 # Collect all arguments for the java command:
-#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
 #     and any embedded shellness will be escaped.
 #   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
 #     treated as '${Hostname}' itself on the command line.
 
 set -- \
         "-Dorg.gradle.appname=$APP_BASE_NAME" \
-        -classpath "$CLASSPATH" \
-        org.gradle.wrapper.GradleWrapperMain \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
         "$@"
 
 # Stop when "xargs" is not available.

gradlew.bat

@@ -13,6 +13,8 @@
 @rem See the License for the specific language governing permissions and
 @rem limitations under the License.
 @rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
 
 @if "%DEBUG%"=="" @echo off
 @rem ##########################################################################
@@ -43,11 +45,11 @@ set JAVA_EXE=java.exe
 %JAVA_EXE% -version >NUL 2>&1
 if %ERRORLEVEL% equ 0 goto execute
 
-echo.
-echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
@@ -57,22 +59,21 @@ set JAVA_EXE=%JAVA_HOME%/bin/java.exe
 
 if exist "%JAVA_EXE%" goto execute
 
-echo.
-echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
-echo.
-echo Please set the JAVA_HOME variable in your environment to match the
-echo location of your Java installation.
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
 
 goto fail
 
 :execute
 @rem Setup the command line
 
-set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
 
 
 @rem Execute Gradle
-"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %*
 
 :end
 @rem End local scope for the variables with windows NT shell

src/main/java/com/sparrowwallet/drongo/ExtendedKey.java

@@ -75,10 +75,14 @@ public class ExtendedKey {
     }
 
     public static ExtendedKey fromDescriptor(String descriptor) {
+        return fromDescriptor(descriptor, false);
+    }
+
+    public static ExtendedKey fromDescriptor(String descriptor, boolean ignoreNetwork) {
         byte[] serializedKey = Base58.decodeChecked(descriptor);
         ByteBuffer buffer = ByteBuffer.wrap(serializedKey);
         int headerInt = buffer.getInt();
-        Header header = Header.getHeader(headerInt);
+        Header header = Header.getHeader(headerInt, ignoreNetwork);
         if(header == null) {
             throw new IllegalArgumentException("Unknown header bytes for extended key on " + Network.getCanonical().getName() + ": " + DeterministicKey.toBase58(serializedKey).substring(0, 4));
         }
@@ -239,7 +243,7 @@ public class ExtendedKey {
             return Network.get().getXpubHeader();
         }
 
-        private static Header getHeader(int header) {
+        private static Header getHeader(int header, boolean ignoreNetwork) {
             for(Header extendedKeyHeader : getHeaders(Network.get())) {
                 if(header == extendedKeyHeader.header) {
                     return extendedKeyHeader;
@@ -249,6 +253,9 @@ public class ExtendedKey {
             for(Network otherNetwork : getOtherNetworks(Network.get())) {
                 for(Header otherNetworkKeyHeader : getHeaders(otherNetwork)) {
                     if(header == otherNetworkKeyHeader.header) {
+                        if(ignoreNetwork) {
+                            return otherNetworkKeyHeader;
+                        }
                         throw new IllegalArgumentException("Provided " + otherNetworkKeyHeader.name + " extended key invalid on configured " + Network.getCanonical().getName() + " network. Use a " + otherNetwork.getName() + " configuration to use this extended key.");
                     }
                 }

src/main/java/com/sparrowwallet/drongo/FileType.java

@@ -0,0 +1,5 @@
+package com.sparrowwallet.drongo;
+
+public enum FileType {
+    TEXT, JSON, BINARY, UNKNOWN;
+}

src/main/java/com/sparrowwallet/drongo/IOUtils.java

@@ -0,0 +1,157 @@
+package com.sparrowwallet.drongo;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.*;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.URL;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.SecureRandom;
+import java.util.*;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+public class IOUtils {
+    private static final Logger log = LoggerFactory.getLogger(IOUtils.class);
+
+    public static FileType getFileType(File file) {
+        try {
+            String type = Files.probeContentType(file.toPath());
+            if(type == null) {
+                if(file.getName().toLowerCase(Locale.ROOT).endsWith("txn") || file.getName().toLowerCase(Locale.ROOT).endsWith("psbt")) {
+                    return FileType.TEXT;
+                }
+
+                if(file.exists()) {
+                    try(BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {
+                        String line = br.readLine();
+                        if(line != null) {
+                            if(line.startsWith("01000000") || line.startsWith("cHNid")) {
+                                return FileType.TEXT;
+                            } else if(line.startsWith("{")) {
+                                return FileType.JSON;
+                            }
+                        }
+                    }
+                }
+
+                return FileType.BINARY;
+            } else if (type.equals("application/json")) {
+                return FileType.JSON;
+            } else if (type.startsWith("text")) {
+                return FileType.TEXT;
+            }
+        } catch(IOException e) {
+            //ignore
+        }
+
+        return FileType.UNKNOWN;
+    }
+
+    /**
+     * Lists the contents of a resource directory. Non-recursive.
+     * Works for regular files, JARs, and Java modules.
+     *
+     * @param clazz A class from the same module or package as the resources.
+     * @param path The resource directory path (e.g., "myfolder/"). Must end with "/", must not start with "/".
+     * @return An array of filenames (not full paths) in the specified directory.
+     * @throws IOException If an I/O error occurs while accessing the resources.
+     * @throws URISyntaxException If the path is invalid or unsupported.
+     */
+    public static String[] getResourceListing(Class<?> clazz, String path) throws URISyntaxException, IOException {
+        URL dirURL = clazz.getClassLoader().getResource(path);
+        if(dirURL != null && dirURL.getProtocol().equals("file")) {
+            return new File(dirURL.toURI()).list();
+        }
+
+        if(dirURL == null) {
+            String me = clazz.getName().replace(".", "/") + ".class";
+            dirURL = clazz.getClassLoader().getResource(me);
+            if(dirURL == null) {
+                throw new IOException("Resource directory '" + path + "' not found for class " + clazz.getName());
+            }
+        }
+
+        if(dirURL.getProtocol().equals("jar")) {
+            String jarPath = dirURL.getPath().substring(5, dirURL.getPath().indexOf("!"));
+            Set<String> result = new HashSet<>();
+
+            try(JarFile jar = new JarFile(URLDecoder.decode(jarPath, StandardCharsets.UTF_8))) {
+                Enumeration<JarEntry> entries = jar.entries();
+
+                while(entries.hasMoreElements()) {
+                    String name = entries.nextElement().getName();
+                    if(name.startsWith(path)) {
+                        String entry = name.substring(path.length());
+                        int checkSubdir = entry.indexOf("/");
+                        if(checkSubdir >= 0) {
+                            entry = entry.substring(0, checkSubdir);
+                        }
+                        if(!entry.isEmpty()) {
+                            result.add(entry);
+                        }
+                    }
+                }
+            }
+
+            return result.toArray(new String[0]);
+        }
+
+        if(dirURL.getProtocol().equals("jrt")) {
+            Module module = clazz.getModule();
+            if(module == null || module.getName() == null) {
+                throw new IOException("Class " + clazz.getName() + " is not in a named module");
+            }
+            try(java.nio.file.FileSystem jrtFs = FileSystems.newFileSystem(URI.create("jrt:/"), Collections.emptyMap())) {
+                Path resourcePath = jrtFs.getPath("modules", module.getName(), path);
+                try(var stream = Files.list(resourcePath)) {
+                    return stream.filter(Files::isRegularFile).map(p -> p.getFileName().toString()).toArray(String[]::new);
+                }
+            }
+        }
+
+        throw new UnsupportedOperationException("Cannot list files for URL " + dirURL);
+    }
+
+    public static boolean deleteDirectory(File directory) {
+        try(var stream = Files.walk(directory.toPath())) {
+            stream.sorted(Comparator.reverseOrder())
+                    .map(Path::toFile)
+                    .forEach(File::delete);
+        } catch(IOException e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public static boolean secureDelete(File file) {
+        if(file.exists()) {
+            long length = file.length();
+            SecureRandom random = new SecureRandom();
+            byte[] data = new byte[1024*1024];
+            random.nextBytes(data);
+            try(RandomAccessFile raf = new RandomAccessFile(file, "rws")) {
+                raf.seek(0);
+                raf.getFilePointer();
+                int pos = 0;
+                while(pos < length) {
+                    raf.write(data);
+                    pos += data.length;
+                }
+            } catch(IOException e) {
+                log.warn("Error overwriting file for deletion: " + file.getName(), e);
+            }
+
+            return file.delete();
+        }
+
+        return false;
+    }
+}

src/main/java/com/sparrowwallet/drongo/KeyDerivation.java

@@ -8,6 +8,8 @@ import java.util.List;
 import java.util.Locale;
 
 public class KeyDerivation {
+    public static final String DEFAULT_WATCH_ONLY_FINGERPRINT = "00000000";
+
     private final String masterFingerprint;
     private final String derivationPath;
     private transient List<ChildNumber> derivation;
@@ -17,9 +19,13 @@ public class KeyDerivation {
     }
 
     public KeyDerivation(String masterFingerprint, String derivationPath) {
+        this(masterFingerprint, derivationPath, false);
+    }
+
+    public KeyDerivation(String masterFingerprint, String derivationPath, boolean rewritePath) {
         this.masterFingerprint = masterFingerprint == null ? null : masterFingerprint.toLowerCase(Locale.ROOT);
-        this.derivationPath = derivationPath;
         this.derivation = parsePath(derivationPath);
+        this.derivationPath = rewritePath ? writePath(derivation) : derivationPath;
     }
 
     public String getMasterFingerprint() {
@@ -100,6 +106,24 @@ public class KeyDerivation {
         return List.of(new ChildNumber(47, true), new ChildNumber(Network.get() == Network.MAINNET ? 0 : 1, true), new ChildNumber(Math.max(0, account), true));
     }
 
+    public static List<ChildNumber> getBip352Derivation(int account) {
+        return List.of(new ChildNumber(352, true), new ChildNumber(Network.get() == Network.MAINNET ? 0 : 1, true), new ChildNumber(Math.max(0, account), true));
+    }
+
+    public static List<ChildNumber> getBip352ScanDerivation(List<ChildNumber> derivation) {
+        List<ChildNumber> scanDerivation = new ArrayList<>(derivation);
+        scanDerivation.add(new ChildNumber(1, true));
+        scanDerivation.add(new ChildNumber(0, false));
+        return Collections.unmodifiableList(scanDerivation);
+    }
+
+    public static List<ChildNumber> getBip352SpendDerivation(List<ChildNumber> derivation) {
+        List<ChildNumber> spendDerivation = new ArrayList<>(derivation);
+        spendDerivation.add(new ChildNumber(0, true));
+        spendDerivation.add(new ChildNumber(0, false));
+        return Collections.unmodifiableList(spendDerivation);
+    }
+
     public KeyDerivation copy() {
         return new KeyDerivation(masterFingerprint, derivationPath);
     }

src/main/java/com/sparrowwallet/drongo/NativeUtils.java

@@ -5,6 +5,10 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.file.*;
+import java.nio.file.attribute.PosixFilePermission;
+import java.nio.file.attribute.PosixFilePermissions;
+import java.util.EnumSet;
+import java.util.Set;
 
 /**
  * A simple library class which helps with loading dynamic libraries stored in the
@@ -110,9 +114,33 @@ public class NativeUtils {
         String tempDir = System.getProperty("java.io.tmpdir");
         File generatedDir = new File(tempDir, prefix + System.nanoTime());
 
-        if (!generatedDir.mkdir())
+        if(!createOwnerOnlyDirectory(generatedDir)) {
             throw new IOException("Failed to create temp directory " + generatedDir.getName());
+        }
 
         return generatedDir;
     }
+
+    public static boolean createOwnerOnlyDirectory(File directory) throws IOException {
+        try {
+            if(OsType.getCurrent() == OsType.WINDOWS) {
+                Files.createDirectories(directory.toPath());
+                return true;
+            }
+
+            Files.createDirectories(directory.toPath(), PosixFilePermissions.asFileAttribute(getDirectoryOwnerOnlyPosixFilePermissions()));
+            return true;
+        } catch(UnsupportedOperationException e) {
+            return directory.mkdirs();
+        }
+    }
+
+    private static Set<PosixFilePermission> getDirectoryOwnerOnlyPosixFilePermissions() {
+        Set<PosixFilePermission> ownerOnly = EnumSet.noneOf(PosixFilePermission.class);
+        ownerOnly.add(PosixFilePermission.OWNER_READ);
+        ownerOnly.add(PosixFilePermission.OWNER_WRITE);
+        ownerOnly.add(PosixFilePermission.OWNER_EXECUTE);
+
+        return ownerOnly;
+    }
 }

src/main/java/com/sparrowwallet/drongo/Network.java

@@ -3,16 +3,16 @@ package com.sparrowwallet.drongo;
 import java.util.Locale;
 
 public enum Network {
-    MAINNET("mainnet", "Mainnet", "mainnet", 0, "1", 5, "3", "bc", ExtendedKey.Header.xprv, ExtendedKey.Header.xpub, 128, 8332),
-    TESTNET("testnet", "Testnet3", "testnet3", 111, "mn", 196, "2", "tb", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 18332),
-    REGTEST("regtest", "Regtest", "regtest", 111, "mn", 196, "2", "bcrt", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 18443),
-    SIGNET("signet", "Signet", "signet", 111, "mn", 196, "2", "tb", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 38332),
-    TESTNET4("testnet4", "Testnet4", "testnet4", 111, "mn", 196, "2", "tb", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 48332);
+    MAINNET("mainnet", "Mainnet", "mainnet", 0, "1", 5, "3", "bc", "sp", "spscan", "spspend", ExtendedKey.Header.xprv, ExtendedKey.Header.xpub, 128, 8332),
+    TESTNET("testnet", "Testnet3", "testnet3", 111, "mn", 196, "2", "tb", "tsp", "tspscan", "tspspend", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 18332),
+    REGTEST("regtest", "Regtest", "regtest", 111, "mn", 196, "2", "bcrt", "sprt", "tspscan", "tspspend", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 18443),
+    SIGNET("signet", "Signet", "signet", 111, "mn", 196, "2", "tb", "tsp", "tspscan", "tspspend", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 38332),
+    TESTNET4("testnet4", "Testnet4", "testnet4", 111, "mn", 196, "2", "tb", "tsp", "tspscan", "tspspend", ExtendedKey.Header.tprv, ExtendedKey.Header.tpub, 239, 48332);
 
     public static final String BLOCK_HEIGHT_PROPERTY = "com.sparrowwallet.blockHeight";
     private static final Network[] CANONICAL_VALUES = new Network[]{MAINNET, TESTNET, REGTEST, SIGNET};
 
-    Network(String name, String displayName, String home, int p2pkhAddressHeader, String p2pkhAddressPrefix, int p2shAddressHeader, String p2shAddressPrefix, String bech32AddressHrp, ExtendedKey.Header xprvHeader, ExtendedKey.Header xpubHeader, int dumpedPrivateKeyHeader, int defaultPort) {
+    Network(String name, String displayName, String home, int p2pkhAddressHeader, String p2pkhAddressPrefix, int p2shAddressHeader, String p2shAddressPrefix, String bech32AddressHrp, String spAddressHrp, String spScanKeyHrp, String spSpendKeyHrp, ExtendedKey.Header xprvHeader, ExtendedKey.Header xpubHeader, int dumpedPrivateKeyHeader, int defaultPort) {
         this.name = name;
         this.displayName = displayName;
         this.home = home;
@@ -21,6 +21,9 @@ public enum Network {
         this.p2shAddressHeader = p2shAddressHeader;
         this.p2shAddressPrefix = p2shAddressPrefix;
         this.bech32AddressHrp = bech32AddressHrp;
+        this.spAddressHrp = spAddressHrp;
+        this.spScanKeyHrp = spScanKeyHrp;
+        this.spSpendKeyHrp = spSpendKeyHrp;
         this.xprvHeader = xprvHeader;
         this.xpubHeader = xpubHeader;
         this.dumpedPrivateKeyHeader = dumpedPrivateKeyHeader;
@@ -35,6 +38,9 @@ public enum Network {
     private final int p2shAddressHeader;
     private final String p2shAddressPrefix;
     private final String bech32AddressHrp;
+    private final String spAddressHrp;
+    private final String spScanKeyHrp;
+    private final String spSpendKeyHrp;
     private final ExtendedKey.Header xprvHeader;
     private final ExtendedKey.Header xpubHeader;
     private final int dumpedPrivateKeyHeader;
@@ -70,6 +76,18 @@ public enum Network {
         return bech32AddressHrp;
     }
 
+    public String getSilentPaymentsAddressHrp() {
+        return spAddressHrp;
+    }
+
+    public String getSilentPaymentsScanKeyHrp() {
+        return spScanKeyHrp;
+    }
+
+    public String getSilentPaymentsSpendKeyHrp() {
+        return spSpendKeyHrp;
+    }
+
     public ExtendedKey.Header getXprvHeader() {
         return xprvHeader;
     }

src/main/java/com/sparrowwallet/drongo/OsType.java

@@ -0,0 +1,48 @@
+package com.sparrowwallet.drongo;
+
+public enum OsType {
+    WINDOWS("Windows"),
+    MACOS("macOS"),
+    UNIX("Unix"),
+    UNKNOWN("");
+
+    private static final OsType current = getCurrentPlatform();
+    private final String platformId;
+
+    OsType(String platformId) {
+        this.platformId = platformId;
+    }
+
+    /**
+     * Returns platform id. Usually used to specify platform dependent styles
+     *
+     * @return platform id
+     */
+    public String getPlatformId() {
+        return platformId;
+    }
+
+    /**
+     * @return the current OS.
+     */
+    public static OsType getCurrent() {
+        return current;
+    }
+
+    private static OsType getCurrentPlatform() {
+        String osName = System.getProperty("os.name");
+        if(osName.startsWith("Windows")) {
+            return WINDOWS;
+        }
+        if(osName.startsWith("Mac")) {
+            return MACOS;
+        }
+        if(osName.startsWith("SunOS")) {
+            return UNIX;
+        }
+        if(osName.startsWith("Linux")) {
+            return UNIX;
+        }
+        return UNKNOWN;
+    }
+}

src/main/java/com/sparrowwallet/drongo/OutputDescriptor.java

@@ -6,15 +6,18 @@ import com.sparrowwallet.drongo.crypto.DeterministicKey;
 import com.sparrowwallet.drongo.crypto.ECKey;
 import com.sparrowwallet.drongo.policy.Policy;
 import com.sparrowwallet.drongo.policy.PolicyType;
+import com.sparrowwallet.drongo.crypto.DumpedPrivateKey;
 import com.sparrowwallet.drongo.protocol.ProtocolException;
 import com.sparrowwallet.drongo.protocol.Script;
 import com.sparrowwallet.drongo.protocol.ScriptType;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentScanAddress;
 import com.sparrowwallet.drongo.wallet.*;
 
 import java.math.BigInteger;
 import java.util.*;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import java.util.stream.Collectors;
 
 import static com.sparrowwallet.drongo.KeyDerivation.parsePath;
 
@@ -22,12 +25,17 @@ public class OutputDescriptor {
     private static final String INPUT_CHARSET = "0123456789()[],'/*abcdefgh@:$%{}IJKLMNOPQRSTUVWXYZ&+-.;<=>?!^_|~ijklmnopqrstuvwxyzABCDEFGH`#\"\\ ";
     private static final String CHECKSUM_CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
 
-    private static final Pattern XPUB_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(.(?:pub|prv)[^/\\,)]{100,112})(/[/\\d*'hH<>;]+)?");
-    private static final Pattern PUBKEY_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(0[23][0-9a-fA-F]{32})");
+    public static final Pattern XPUB_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(.(?:pub|prv)[^/\\,)]{100,112})(/[/\\d*'hH<>;]+)?");
+    private static final Pattern PUBKEY_PATTERN = Pattern.compile("(\\[[^\\]]+\\])?(0[23][0-9a-fA-F]{64})");
     private static final Pattern MULTI_PATTERN = Pattern.compile("multi\\((\\d+)");
-    private static final Pattern KEY_ORIGIN_PATTERN = Pattern.compile("\\[([A-Fa-f0-9]{8})([/\\d'hH]+)?\\]");
+    public static final Pattern KEY_ORIGIN_PATTERN = Pattern.compile("\\[([A-Fa-f0-9]{8})([/\\d'hH]+)?\\]");
     private static final Pattern MULTIPATH_PATTERN = Pattern.compile("<([\\d*'hH;]+)>");
     private static final Pattern CHECKSUM_PATTERN = Pattern.compile("#([" + CHECKSUM_CHARSET + "]{8})$");
+    private static final Pattern ANNOTATION_PATTERN = Pattern.compile("([a-zA-Z]+)=([0-9]+)");
+
+    public static final String ANNOTATION_BLOCK_HEIGHT = "bh";
+    public static final String ANNOTATION_GAP_LIMIT = "gl";
+    public static final String ANNOTATION_MAX_LABEL = "ml";
 
     private final ScriptType scriptType;
     private final int multisigThreshold;
@@ -35,6 +43,9 @@ public class OutputDescriptor {
     private final Map<ExtendedKey, String> mapChildrenDerivations;
     private final Map<ExtendedKey, String> mapExtendedPublicKeyLabels;
     private final Map<ExtendedKey, ExtendedKey> extendedMasterPrivateKeys;
+    private final Map<SilentPaymentScanAddress, KeyDerivation> silentPaymentScanAddresses;
+    private final Map<SilentPaymentScanAddress, String> mapSilentPaymentLabels;
+    private final Map<String, Integer> annotations;
 
     public OutputDescriptor(ScriptType scriptType, ExtendedKey extendedPublicKey, KeyDerivation keyDerivation) {
         this(scriptType, Collections.singletonMap(extendedPublicKey, keyDerivation));
@@ -61,18 +72,45 @@ public class OutputDescriptor {
     }
 
     public OutputDescriptor(ScriptType scriptType, int multisigThreshold, Map<ExtendedKey, KeyDerivation> extendedPublicKeys, Map<ExtendedKey, String> mapChildrenDerivations, Map<ExtendedKey, String> mapExtendedPublicKeyLabels, Map<ExtendedKey, ExtendedKey> extendedMasterPrivateKeys) {
+        this(scriptType, multisigThreshold, extendedPublicKeys, mapChildrenDerivations, mapExtendedPublicKeyLabels, extendedMasterPrivateKeys, new LinkedHashMap<>());
+    }
+
+    public OutputDescriptor(ScriptType scriptType, int multisigThreshold, Map<ExtendedKey, KeyDerivation> extendedPublicKeys, Map<ExtendedKey, String> mapChildrenDerivations, Map<ExtendedKey, String> mapExtendedPublicKeyLabels, Map<ExtendedKey, ExtendedKey> extendedMasterPrivateKeys, Map<String, Integer> annotations) {
         this.scriptType = scriptType;
         this.multisigThreshold = multisigThreshold;
         this.extendedPublicKeys = extendedPublicKeys;
         this.mapChildrenDerivations = mapChildrenDerivations;
         this.mapExtendedPublicKeyLabels = mapExtendedPublicKeyLabels;
         this.extendedMasterPrivateKeys = extendedMasterPrivateKeys;
+        this.silentPaymentScanAddresses = new LinkedHashMap<>();
+        this.mapSilentPaymentLabels = new LinkedHashMap<>();
+        this.annotations = annotations;
+    }
+
+    public OutputDescriptor(Map<SilentPaymentScanAddress, KeyDerivation> silentPaymentScanAddresses, Map<SilentPaymentScanAddress, String> mapSilentPaymentLabels) {
+        this(silentPaymentScanAddresses, mapSilentPaymentLabels, new LinkedHashMap<>());
+    }
+
+    public OutputDescriptor(Map<SilentPaymentScanAddress, KeyDerivation> silentPaymentScanAddresses, Map<SilentPaymentScanAddress, String> mapSilentPaymentLabels, Map<String, Integer> annotations) {
+        this.scriptType = ScriptType.P2TR;
+        this.multisigThreshold = 1;
+        this.extendedPublicKeys = new LinkedHashMap<>();
+        this.mapChildrenDerivations = new LinkedHashMap<>();
+        this.mapExtendedPublicKeyLabels = new LinkedHashMap<>();
+        this.extendedMasterPrivateKeys = new LinkedHashMap<>();
+        this.silentPaymentScanAddresses = silentPaymentScanAddresses;
+        this.mapSilentPaymentLabels = mapSilentPaymentLabels;
+        this.annotations = annotations;
     }
 
     public Set<ExtendedKey> getExtendedPublicKeys() {
         return Collections.unmodifiableSet(extendedPublicKeys.keySet());
     }
 
+    public Map<ExtendedKey, KeyDerivation> getExtendedPublicKeysMap() {
+        return Collections.unmodifiableMap(extendedPublicKeys);
+    }
+
     public KeyDerivation getKeyDerivation(ExtendedKey extendedPublicKey) {
         return extendedPublicKeys.get(extendedPublicKey);
     }
@@ -81,6 +119,10 @@ public class OutputDescriptor {
         return multisigThreshold;
     }
 
+    public Map<ExtendedKey, String> getChildDerivationsMap() {
+        return Collections.unmodifiableMap(mapChildrenDerivations);
+    }
+
     public String getChildDerivationPath(ExtendedKey extendedPublicKey) {
         return mapChildrenDerivations.get(extendedPublicKey);
     }
@@ -153,7 +195,7 @@ public class OutputDescriptor {
     }
 
     public boolean isCosigner() {
-        return !isMultisig() && scriptType.isAllowed(PolicyType.MULTI);
+        return !isMultisig() && scriptType.isAllowed(PolicyType.MULTI_HD);
     }
 
     public ExtendedKey getSingletonExtendedPublicKey() {
@@ -168,6 +210,22 @@ public class OutputDescriptor {
         return scriptType;
     }
 
+    public Map<SilentPaymentScanAddress, KeyDerivation> getSilentPaymentScanAddresses() {
+        return Collections.unmodifiableMap(silentPaymentScanAddresses);
+    }
+
+    public boolean isSilentPayments() {
+        return !silentPaymentScanAddresses.isEmpty();
+    }
+
+    public Map<String, Integer> getAnnotations() {
+        return Collections.unmodifiableMap(annotations);
+    }
+
+    public void clearAnnotations() {
+        annotations.clear();
+    }
+
     public boolean describesMultipleAddresses() {
         for(ExtendedKey pubKey : extendedPublicKeys.keySet()) {
             if(describesMultipleAddresses(pubKey)) {
@@ -224,7 +282,7 @@ public class OutputDescriptor {
     }
 
     public Address getAddress(DeterministicKey childKey) {
-        return scriptType.getAddress(childKey);
+        return scriptType.getAddress(PolicyType.SINGLE_HD, childKey);
     }
 
     private Address getAddress(Script multisigScript) {
@@ -256,8 +314,12 @@ public class OutputDescriptor {
     }
 
     public Wallet toWallet() {
+        if(isSilentPayments()) {
+            return toSilentPaymentWallet();
+        }
+
         Wallet wallet = new Wallet();
-        wallet.setPolicyType(isMultisig() || isCosigner() ? PolicyType.MULTI : PolicyType.SINGLE);
+        wallet.setPolicyType(isMultisig() || isCosigner() ? PolicyType.MULTI_HD : PolicyType.SINGLE_HD);
         wallet.setScriptType(scriptType);
 
         for(Map.Entry<ExtendedKey,KeyDerivation> extKeyEntry : extendedPublicKeys.entrySet()) {
@@ -267,11 +329,13 @@ public class OutputDescriptor {
                 ExtendedKey xprv = extendedMasterPrivateKeys.get(xpub);
                 MasterPrivateExtendedKey masterPrivateExtendedKey = new MasterPrivateExtendedKey(xprv.getKey().getPrivKeyBytes(), xprv.getKey().getChainCode());
                 String childDerivation = mapChildrenDerivations.get(xpub) == null ? scriptType.getDefaultDerivationPath() : mapChildrenDerivations.get(xpub);
-                if(childDerivation.endsWith("/0/*") || childDerivation.endsWith("/1/*")) {
+                if(childDerivation.endsWith("/<0;1>/*")) {
+                    childDerivation = childDerivation.substring(0, childDerivation.length() - 8);
+                } else if(childDerivation.endsWith("/0/*") || childDerivation.endsWith("/1/*")) {
                     childDerivation = childDerivation.substring(0, childDerivation.length() - 4);
                 }
                 try {
-                    keystore = Keystore.fromMasterPrivateExtendedKey(masterPrivateExtendedKey, KeyDerivation.parsePath(childDerivation));
+                    keystore = Keystore.fromMasterPrivateExtendedKey(masterPrivateExtendedKey, wallet.getPolicyType(), KeyDerivation.parsePath(childDerivation));
                 } catch(MnemonicException e) {
                     throw new RuntimeException(e);
                 }
@@ -287,10 +351,54 @@ public class OutputDescriptor {
         }
 
         wallet.setDefaultPolicy(Policy.getPolicy(wallet.getPolicyType(), wallet.getScriptType(), wallet.getKeystores(), getMultisigThreshold()));
+        applyAnnotations(wallet);
+
         return wallet;
     }
 
+    private Wallet toSilentPaymentWallet() {
+        Wallet wallet = new Wallet();
+        wallet.setPolicyType(PolicyType.SINGLE_SP);
+        wallet.setScriptType(ScriptType.P2TR);
+
+        Map.Entry<SilentPaymentScanAddress, KeyDerivation> entry = silentPaymentScanAddresses.entrySet().iterator().next();
+        SilentPaymentScanAddress spScanAddress = entry.getKey();
+        KeyDerivation keyDerivation = entry.getValue();
+
+        Keystore keystore = new Keystore();
+        keystore.setSource(KeystoreSource.SW_WATCH);
+        keystore.setWalletModel(WalletModel.SPARROW);
+        keystore.setKeyDerivation(keyDerivation);
+        keystore.setSilentPaymentScanAddress(spScanAddress);
+        setKeystoreLabel(keystore);
+
+        wallet.getKeystores().add(keystore);
+        wallet.setDefaultPolicy(Policy.getPolicy(PolicyType.SINGLE_SP, ScriptType.P2TR, wallet.getKeystores(), 1));
+        applyAnnotations(wallet);
+
+        return wallet;
+    }
+
+    private void applyAnnotations(Wallet wallet) {
+        if(annotations.containsKey(ANNOTATION_BLOCK_HEIGHT)) {
+            wallet.setBirthHeight(annotations.get(ANNOTATION_BLOCK_HEIGHT));
+        }
+        if(annotations.containsKey(ANNOTATION_GAP_LIMIT) && wallet.getPolicyType() != PolicyType.SINGLE_SP) {
+            wallet.setGapLimit(annotations.get(ANNOTATION_GAP_LIMIT));
+        }
+    }
+
     public Wallet toKeystoreWallet(String masterFingerprint) {
+        if(isSilentPayments()) {
+            Wallet wallet = toSilentPaymentWallet();
+            if(masterFingerprint != null) {
+                KeyDerivation existing = wallet.getKeystores().getFirst().getKeyDerivation();
+                wallet.getKeystores().getFirst().setKeyDerivation(new KeyDerivation(masterFingerprint, existing.getDerivationPath()));
+            }
+
+            return wallet;
+        }
+
         Wallet wallet = new Wallet();
         if(isMultisig()) {
             throw new IllegalStateException("Multisig output descriptors are unsupported.");
@@ -307,14 +415,21 @@ public class OutputDescriptor {
         keystore.setExtendedPublicKey(extendedKey);
         setKeystoreLabel(keystore);
         wallet.getKeystores().add(keystore);
-        wallet.setDefaultPolicy(Policy.getPolicy(isCosigner() ? PolicyType.MULTI : PolicyType.SINGLE, wallet.getScriptType(), wallet.getKeystores(), 1));
+        wallet.setDefaultPolicy(Policy.getPolicy(isCosigner() ? PolicyType.MULTI_HD : PolicyType.SINGLE_HD, wallet.getScriptType(), wallet.getKeystores(), 1));
+        applyAnnotations(wallet);
 
         return wallet;
     }
 
     public void setKeystoreLabel(Keystore keystore) {
+        String label = null;
         if(keystore.getExtendedPublicKey() != null && mapExtendedPublicKeyLabels.get(keystore.getExtendedPublicKey()) != null) {
-            String label = mapExtendedPublicKeyLabels.get(keystore.getExtendedPublicKey()).trim();
+            label = mapExtendedPublicKeyLabels.get(keystore.getExtendedPublicKey());
+        } else if(keystore.getSilentPaymentScanAddress() != null && mapSilentPaymentLabels.get(keystore.getSilentPaymentScanAddress()) != null) {
+            label = mapSilentPaymentLabels.get(keystore.getSilentPaymentScanAddress());
+        }
+        if(label != null) {
+            label = label.trim();
             if(label.length() > Keystore.MAX_LABEL_LENGTH) {
                 label = label.substring(0, Keystore.MAX_LABEL_LENGTH);
             }
@@ -339,6 +454,16 @@ public class OutputDescriptor {
     }
 
     public static OutputDescriptor getOutputDescriptor(Wallet wallet, List<KeyPurpose> keyPurposes, Integer index) {
+        Map<String, Integer> annotations = getWalletAnnotations(wallet);
+
+        if(wallet.getPolicyType() == PolicyType.SINGLE_SP) {
+            Keystore keystore = wallet.getKeystores().getFirst();
+            Map<SilentPaymentScanAddress, KeyDerivation> spMap = new LinkedHashMap<>();
+            spMap.put(keystore.getSilentPaymentScanAddress(), keystore.getKeyDerivation());
+
+            return new OutputDescriptor(spMap, new LinkedHashMap<>(), annotations);
+        }
+
         Map<ExtendedKey, KeyDerivation> extendedKeyDerivationMap = new LinkedHashMap<>();
         Map<ExtendedKey, String> extendedKeyChildDerivationMap = new LinkedHashMap<>();
         for(Keystore keystore : wallet.getKeystores()) {
@@ -360,12 +485,45 @@ public class OutputDescriptor {
         return new OutputDescriptor(wallet.getScriptType(), wallet.getDefaultPolicy().getNumSignaturesRequired(), extendedKeyDerivationMap, extendedKeyChildDerivationMap);
     }
 
+    private static Map<String, Integer> getWalletAnnotations(Wallet wallet) {
+        Map<String, Integer> annotations = new LinkedHashMap<>();
+        if(wallet.getBirthHeight() != null) {
+            annotations.put(ANNOTATION_BLOCK_HEIGHT, wallet.getBirthHeight());
+        }
+        if(wallet.gapLimit() != null && wallet.getPolicyType() != PolicyType.SINGLE_SP) {
+            annotations.put(ANNOTATION_GAP_LIMIT, wallet.getGapLimit());
+        }
+
+        return annotations;
+    }
+
     // See https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md
     public static OutputDescriptor getOutputDescriptor(String descriptor) {
         return getOutputDescriptor(descriptor, new LinkedHashMap<>());
     }
 
     public static OutputDescriptor getOutputDescriptor(String descriptor, Map<ExtendedKey, String> mapExtendedPublicKeyLabels) {
+        Matcher checksumMatcher = CHECKSUM_PATTERN.matcher(descriptor);
+        if(checksumMatcher.find()) {
+            String checksum = checksumMatcher.group(1);
+            String calculatedChecksum = getChecksum(descriptor.substring(0, checksumMatcher.start()));
+            if(!checksum.equals(calculatedChecksum)) {
+                throw new IllegalArgumentException("Descriptor checksum invalid - checksum of " + checksum + " did not match calculated checksum of " + calculatedChecksum);
+            }
+            descriptor = descriptor.substring(0, checksumMatcher.start());
+        }
+
+        Map<String, Integer> annotations = new LinkedHashMap<>();
+        int annotationStart = descriptor.indexOf('?');
+        if(annotationStart >= 0) {
+            annotations = parseAnnotations(descriptor.substring(annotationStart + 1));
+            descriptor = descriptor.substring(0, annotationStart);
+        }
+
+        if(descriptor.toLowerCase(Locale.ROOT).startsWith("sp(")) {
+            return parseSilentPaymentDescriptor(descriptor, annotations);
+        }
+
         ScriptType scriptType = ScriptType.fromDescriptor(descriptor);
         if(scriptType == null) {
             ExtendedKey.Header header = ExtendedKey.Header.fromExtendedKey(descriptor);
@@ -377,7 +535,7 @@ public class OutputDescriptor {
         }
 
         int threshold = getMultisigThreshold(descriptor);
-        return getOutputDescriptorImpl(scriptType, threshold, descriptor, mapExtendedPublicKeyLabels);
+        return getOutputDescriptorImpl(scriptType, threshold, descriptor, mapExtendedPublicKeyLabels, annotations);
     }
 
     private static int getMultisigThreshold(String descriptor) {
@@ -390,56 +548,47 @@ public class OutputDescriptor {
         }
     }
 
-    private static OutputDescriptor getOutputDescriptorImpl(ScriptType scriptType, int multisigThreshold, String descriptor, Map<ExtendedKey, String> mapExtendedPublicKeyLabels) {
-        Matcher checksumMatcher = CHECKSUM_PATTERN.matcher(descriptor);
-        if(checksumMatcher.find()) {
-            String checksum = checksumMatcher.group(1);
-            String calculatedChecksum = getChecksum(descriptor.substring(0, checksumMatcher.start()));
-            if(!checksum.equals(calculatedChecksum)) {
-                throw new IllegalArgumentException("Descriptor checksum invalid - checksum of " + checksum + " did not match calculated checksum of " + calculatedChecksum);
-            }
-        }
-
+    private static OutputDescriptor getOutputDescriptorImpl(ScriptType scriptType, int multisigThreshold, String descriptor, Map<ExtendedKey, String> mapExtendedPublicKeyLabels, Map<String, Integer> annotations) {
         Map<ExtendedKey, KeyDerivation> keyDerivationMap = new LinkedHashMap<>();
         Map<ExtendedKey, String> keyChildDerivationMap = new LinkedHashMap<>();
         Map<ExtendedKey, ExtendedKey> masterPrivateKeyMap = new LinkedHashMap<>();
         Matcher matcher = XPUB_PATTERN.matcher(descriptor);
         while(matcher.find()) {
-            String masterFingerprint = null;
-            String keyDerivationPath = null;
-            String extKey;
-            String childDerivationPath = null;
-
-            if(matcher.group(1) != null) {
-                String keyOrigin = matcher.group(1);
-                Matcher keyOriginMatcher = KEY_ORIGIN_PATTERN.matcher(keyOrigin);
-                if(keyOriginMatcher.matches()) {
-                    byte[] masterFingerprintBytes = keyOriginMatcher.group(1) != null ? Utils.hexToBytes(keyOriginMatcher.group(1)) : new byte[4];
-                    if(masterFingerprintBytes.length != 4) {
-                        throw new IllegalArgumentException("Master fingerprint must be 4 bytes: " + Utils.bytesToHex(masterFingerprintBytes));
-                    }
-                    masterFingerprint = Utils.bytesToHex(masterFingerprintBytes);
-                    keyDerivationPath = KeyDerivation.writePath(KeyDerivation.parsePath(keyOriginMatcher.group(2)));
-                }
-            }
-
-            extKey = matcher.group(2);
-            if(matcher.group(3) != null) {
-                childDerivationPath = matcher.group(3);
-            }
-
-            KeyDerivation keyDerivation = new KeyDerivation(masterFingerprint, keyDerivationPath);
+            String keyOriginAndExtKey = (matcher.group(1) != null ? matcher.group(1) : "") + matcher.group(2);
+            KeyDerivationAndKey originResult = parseKeyOrigin(keyOriginAndExtKey);
+            KeyDerivation keyDerivation = originResult.keyDerivation();
+            String extKey = originResult.key();
+            String childDerivationPath = matcher.group(3);
             try {
                 ExtendedKey extendedKey = ExtendedKey.fromDescriptor(extKey);
+                if(childDerivationPath != null) {
+                    try {
+                        List<ChildNumber> childPath = KeyDerivation.parsePath(childDerivationPath.replace("<0;1>", "0"));
+                        if(childPath.size() > 2 && (extendedKey.getKey().hasPrivKey() || childPath.stream().noneMatch(ChildNumber::isHardened))) {
+                            childDerivationPath = childDerivationPath.substring(childDerivationPath.lastIndexOf("/", childDerivationPath.lastIndexOf("/") - 1));
+                            childPath = childPath.subList(0, childPath.size() - 2);
+                            if(keyDerivation.getMasterFingerprint() == null) {
+                                keyDerivation = new KeyDerivation(Utils.bytesToHex(extendedKey.getKey().getFingerprint()), keyDerivation.getDerivationPath());
+                            }
+                            keyDerivation = keyDerivation.extend(childPath);
+                            childPath.addFirst(extendedKey.getKeyChildNumber());
+                            DeterministicKey derivedKey = extendedKey.getKey(childPath);
+                            DeterministicKey pubKey = new DeterministicKey(List.of(derivedKey.getPath().getLast()), derivedKey.getChainCode(), derivedKey.getPubKey(), derivedKey.getDepth(), derivedKey.getParentFingerprint());
+                            extendedKey = new ExtendedKey(pubKey, pubKey.getParentFingerprint(), childPath.getLast());
+                        }
+                    } catch(Exception e) {
+                        //ignore and continue
+                    }
+                }
                 if(extendedKey.getKey().hasPrivKey()) {
                     ExtendedKey privateExtendedKey = extendedKey;
                     List<ChildNumber> derivation = keyDerivation.getDerivation();
-                    int depth = derivation.size() == 0 ? scriptType.getDefaultDerivation().size() : derivation.size();
+                    int depth = derivation.isEmpty() ? scriptType.getDefaultDerivation().size() : derivation.size();
                     DeterministicKey prvKey = extendedKey.getKey();
-                    DeterministicKey pubKey = new DeterministicKey(prvKey.getPath(), prvKey.getChainCode(), prvKey.getPubKey(), depth, extendedKey.getParentFingerprint());
+                    DeterministicKey pubKey = new DeterministicKey(List.of(prvKey.getPath().getLast()), prvKey.getChainCode(), prvKey.getPubKey(), depth, extendedKey.getParentFingerprint());
                     extendedKey = new ExtendedKey(pubKey, pubKey.getParentFingerprint(), extendedKey.getKeyChildNumber());
 
-                    if(derivation.size() == 0) {
+                    if(derivation.isEmpty()) {
                         masterPrivateKeyMap.put(extendedKey, privateExtendedKey);
                     }
                 }
@@ -457,7 +606,170 @@ public class OutputDescriptor {
             }
         }
 
-        return new OutputDescriptor(scriptType, multisigThreshold, keyDerivationMap, keyChildDerivationMap, mapExtendedPublicKeyLabels, masterPrivateKeyMap);
+        return new OutputDescriptor(scriptType, multisigThreshold, keyDerivationMap, keyChildDerivationMap, mapExtendedPublicKeyLabels, masterPrivateKeyMap, annotations);
+    }
+
+    private static OutputDescriptor parseSilentPaymentDescriptor(String descriptor, Map<String, Integer> annotations) {
+        if(!descriptor.startsWith("sp(") || !descriptor.endsWith(")")) {
+            throw new IllegalArgumentException("Invalid sp() descriptor format");
+        }
+        String inner = descriptor.substring(3, descriptor.length() - 1);
+
+        int commaIndex = inner.indexOf(',');
+        if(commaIndex < 0) {
+            return parseSingleArgSp(inner.trim(), annotations);
+        } else {
+            return parseTwoArgSp(inner.substring(0, commaIndex).trim(), inner.substring(commaIndex + 1).trim(), annotations);
+        }
+    }
+
+    private record KeyDerivationAndKey(KeyDerivation keyDerivation, String key) {}
+
+    private static KeyDerivationAndKey parseKeyOrigin(String arg) {
+        KeyDerivation keyDerivation = new KeyDerivation(null, (String)null);
+        if(arg.startsWith("[")) {
+            int closeBracket = arg.indexOf(']');
+            if(closeBracket < 0) {
+                throw new IllegalArgumentException("Unclosed key origin bracket in descriptor");
+            }
+            String keyOrigin = arg.substring(0, closeBracket + 1);
+            Matcher keyOriginMatcher = KEY_ORIGIN_PATTERN.matcher(keyOrigin);
+            if(keyOriginMatcher.matches()) {
+                byte[] masterFingerprintBytes = keyOriginMatcher.group(1) != null ? Utils.hexToBytes(keyOriginMatcher.group(1)) : new byte[4];
+                if(masterFingerprintBytes.length != 4) {
+                    throw new IllegalArgumentException("Master fingerprint must be 4 bytes: " + Utils.bytesToHex(masterFingerprintBytes));
+                }
+                String masterFingerprint = Utils.bytesToHex(masterFingerprintBytes);
+                String keyDerivationPath = KeyDerivation.writePath(KeyDerivation.parsePath(keyOriginMatcher.group(2)));
+                keyDerivation = new KeyDerivation(masterFingerprint, keyDerivationPath);
+            }
+            arg = arg.substring(closeBracket + 1);
+        }
+
+        return new KeyDerivationAndKey(keyDerivation, arg);
+    }
+
+    private static OutputDescriptor parseSingleArgSp(String arg, Map<String, Integer> annotations) {
+        KeyDerivationAndKey originResult = parseKeyOrigin(arg);
+        KeyDerivation keyDerivation = originResult.keyDerivation();
+        arg = originResult.key();
+
+        String lowerArg = arg.toLowerCase(Locale.ROOT);
+        String scanHrp = Network.get().getSilentPaymentsScanKeyHrp();
+        String spendHrp = Network.get().getSilentPaymentsSpendKeyHrp();
+        if(!lowerArg.startsWith(scanHrp + "1") && !lowerArg.startsWith(spendHrp + "1")) {
+            throw new IllegalArgumentException("Single argument sp() descriptor requires spscan or spspend encoded key, got: " + arg);
+        }
+
+        SilentPaymentScanAddress spScanAddress = SilentPaymentScanAddress.fromKeyString(arg);
+        Map<SilentPaymentScanAddress, KeyDerivation> spMap = new LinkedHashMap<>();
+        spMap.put(spScanAddress, keyDerivation);
+
+        return new OutputDescriptor(spMap, new LinkedHashMap<>(), annotations);
+    }
+
+    private static OutputDescriptor parseTwoArgSp(String scanArg, String spendArg, Map<String, Integer> annotations) {
+        KeyDerivationAndKey originResult = parseKeyOrigin(scanArg);
+        KeyDerivation keyDerivation = originResult.keyDerivation();
+        if(keyDerivation.getDerivation().size() > 2) {
+            List<ChildNumber> accountDerivation = keyDerivation.getDerivation().subList(0, keyDerivation.getDerivation().size() - 2);
+            if(KeyDerivation.getBip352ScanDerivation(accountDerivation).equals(keyDerivation.getDerivation())) {
+                keyDerivation = new KeyDerivation(keyDerivation.getMasterFingerprint(), accountDerivation);
+            }
+        }
+
+        ECKey scanPrivateKey = parseSilentPaymentScanKey(originResult.key());
+        ECKey spendKey = parseSilentPaymentSpendKey(spendArg);
+
+        ECKey spendPubKey = spendKey.isPubKeyOnly() ? spendKey : ECKey.fromPublicOnly(spendKey.getPubKey());
+        SilentPaymentScanAddress spScanAddress = new SilentPaymentScanAddress(scanPrivateKey, spendPubKey);
+        Map<SilentPaymentScanAddress, KeyDerivation> spMap = new LinkedHashMap<>();
+        spMap.put(spScanAddress, keyDerivation);
+
+        return new OutputDescriptor(spMap, new LinkedHashMap<>(), annotations);
+    }
+
+    private static ECKey parseSilentPaymentScanKey(String arg) {
+        Matcher xprvMatcher = XPUB_PATTERN.matcher(arg);
+        if(xprvMatcher.matches()) {
+            String extKeyStr = xprvMatcher.group(2);
+            String childPath = xprvMatcher.group(3);
+            ExtendedKey extKey = ExtendedKey.fromDescriptor(extKeyStr);
+            if(!extKey.getKey().hasPrivKey()) {
+                throw new IllegalArgumentException("The scan key must be private, and not an xpub: " + extKeyStr);
+            }
+            if(childPath != null) {
+                List<ChildNumber> path = KeyDerivation.parsePath(childPath);
+                path.addFirst(extKey.getKeyChildNumber());
+                DeterministicKey derived = extKey.getKey(path);
+
+                return ECKey.fromPrivate(derived.getPrivKeyBytes(), true);
+            }
+
+            return ECKey.fromPrivate(extKey.getKey().getPrivKeyBytes(), true);
+        }
+
+        DumpedPrivateKey dpk;
+        try {
+            dpk = DumpedPrivateKey.fromBase58(arg);
+        } catch(Exception e) {
+            throw new IllegalArgumentException("Cannot parse sp() scan key as xprv or WIF: " + arg, e);
+        }
+
+        ECKey key = dpk.getKey();
+        if(!key.isCompressed()) {
+            throw new IllegalArgumentException("Uncompressed keys are not allowed in sp() descriptors");
+        }
+
+        return key;
+    }
+
+    private static ECKey parseSilentPaymentSpendKey(String arg) {
+        if(arg.startsWith("[")) {
+            int closeBracket = arg.indexOf(']');
+            if(closeBracket >= 0) {
+                arg = arg.substring(closeBracket + 1);
+            }
+        }
+
+        Matcher xpubMatcher = XPUB_PATTERN.matcher(arg);
+        if(xpubMatcher.matches()) {
+            String extKeyStr = xpubMatcher.group(2);
+            String childPath = xpubMatcher.group(3);
+            ExtendedKey extKey = ExtendedKey.fromDescriptor(extKeyStr);
+            if(childPath != null) {
+                List<ChildNumber> path = KeyDerivation.parsePath(childPath);
+                path.addFirst(extKey.getKeyChildNumber());
+                DeterministicKey derived = extKey.getKey(path);
+
+                return extKey.getKey().hasPrivKey() ? ECKey.fromPrivate(derived.getPrivKeyBytes(), true) : ECKey.fromPublicOnly(derived.getPubKey());
+            }
+
+            return extKey.getKey().hasPrivKey() ? ECKey.fromPrivate(extKey.getKey().getPrivKeyBytes(), true) : ECKey.fromPublicOnly(extKey.getKey().getPubKey());
+        }
+
+        Matcher pubKeyMatcher = PUBKEY_PATTERN.matcher(arg);
+        if(pubKeyMatcher.matches()) {
+            return ECKey.fromPublicOnly(Utils.hexToBytes(pubKeyMatcher.group(2)));
+        }
+
+        throw new IllegalArgumentException("Cannot parse sp() spend key as xpub, xprv, or compressed pubkey: " + arg);
+    }
+
+    private static Map<String, Integer> parseAnnotations(String annotationString) {
+        Map<String, Integer> annotations = new LinkedHashMap<>();
+        String[] pairs = annotationString.split("&");
+        for(String pair : pairs) {
+            Matcher matcher = ANNOTATION_PATTERN.matcher(pair);
+            if(matcher.matches()) {
+                String key = matcher.group(1).toLowerCase(Locale.ROOT);
+                if(!annotations.containsKey(key)) {
+                    annotations.put(key, Integer.parseInt(matcher.group(2)));
+                }
+            }
+        }
+
+        return annotations;
     }
 
     public static String normalize(String descriptor) {
@@ -547,24 +859,53 @@ public class OutputDescriptor {
     }
 
     public String toString(boolean addKeyOrigin, boolean addKey, boolean addChecksum) {
-        StringBuilder builder = new StringBuilder();
-        builder.append(scriptType.getDescriptor());
+        return toString(addKeyOrigin, addKey, addChecksum, false);
+    }
 
-        if(isMultisig()) {
-            builder.append(ScriptType.MULTISIG.getDescriptor());
-            StringJoiner joiner = new StringJoiner(",");
-            joiner.add(Integer.toString(multisigThreshold));
-            for(ExtendedKey pubKey : sortExtendedPubKeys(extendedPublicKeys.keySet())) {
-                String extKeyString = toString(pubKey, addKeyOrigin, addKey);
-                joiner.add(extKeyString);
+    public String toString(boolean addKeyOrigin, boolean addKey, boolean addChecksum, boolean alternateForm) {
+        StringBuilder builder = new StringBuilder();
+
+        if(isSilentPayments()) {
+            Map.Entry<SilentPaymentScanAddress, KeyDerivation> entry = silentPaymentScanAddresses.entrySet().iterator().next();
+            builder.append("sp(");
+            if(alternateForm) {
+                KeyDerivation scanDerivation = new KeyDerivation(entry.getValue().getMasterFingerprint(), KeyDerivation.getBip352ScanDerivation(entry.getValue().getDerivation()));
+                builder.append(writeKey(entry.getKey().getScanKey(), scanDerivation, addKeyOrigin, addKey));
+                builder.append(",");
+                KeyDerivation spendDerivation = new KeyDerivation(entry.getValue().getMasterFingerprint(), KeyDerivation.getBip352SpendDerivation(entry.getValue().getDerivation()));
+                builder.append(writeKey(entry.getKey().getSpendKey(), spendDerivation, addKeyOrigin, addKey));
+            } else {
+                builder.append(writeKey(entry.getKey(), entry.getValue(), addKeyOrigin, addKey));
             }
-            builder.append(joiner.toString());
-            builder.append(ScriptType.MULTISIG.getCloseDescriptor());
+            builder.append(")");
         } else {
-            ExtendedKey extendedPublicKey = getSingletonExtendedPublicKey();
-            builder.append(toString(extendedPublicKey, addKeyOrigin, addKey));
+            builder.append(scriptType.getDescriptor());
+
+            if(isMultisig()) {
+                builder.append(ScriptType.MULTISIG.getDescriptor());
+                StringJoiner joiner = new StringJoiner(",");
+                joiner.add(Integer.toString(multisigThreshold));
+                for(ExtendedKey pubKey : sortExtendedPubKeys(extendedPublicKeys.keySet())) {
+                    String extKeyString = toString(pubKey, addKeyOrigin, addKey);
+                    joiner.add(extKeyString);
+                }
+                builder.append(joiner.toString());
+                builder.append(ScriptType.MULTISIG.getCloseDescriptor());
+            } else {
+                ExtendedKey extendedPublicKey = getSingletonExtendedPublicKey();
+                builder.append(toString(extendedPublicKey, addKeyOrigin, addKey));
+            }
+            builder.append(scriptType.getCloseDescriptor());
+        }
+
+        if(!annotations.isEmpty()) {
+            builder.append("?");
+            StringJoiner annotationJoiner = new StringJoiner("&");
+            for(Map.Entry<String, Integer> entry : annotations.entrySet()) {
+                annotationJoiner.add(entry.getKey() + "=" + entry.getValue());
+            }
+            builder.append(annotationJoiner);
         }
-        builder.append(scriptType.getCloseDescriptor());
 
         if(addChecksum) {
             String descriptor = builder.toString();
@@ -575,7 +916,7 @@ public class OutputDescriptor {
         return builder.toString();
     }
 
-    private List<ExtendedKey> sortExtendedPubKeys(Collection<ExtendedKey> keys) {
+    public List<ExtendedKey> sortExtendedPubKeys(Collection<ExtendedKey> keys) {
         List<ExtendedKey> sortedKeys = new ArrayList<>(keys);
         if(mapChildrenDerivations == null || mapChildrenDerivations.isEmpty() || mapChildrenDerivations.containsKey(null)) {
             return sortedKeys;
@@ -622,13 +963,60 @@ public class OutputDescriptor {
         return writeKey(pubKey, keyDerivation, childDerivation, addKeyOrigin, addKey);
     }
 
+    public static String writeKey(SilentPaymentScanAddress spScanAddress, KeyDerivation keyDerivation, boolean addKeyOrigin, boolean addKey) {
+        return writeKey(spScanAddress, keyDerivation, addKeyOrigin, addKey, false);
+    }
+
+    public static String writeKey(SilentPaymentScanAddress spScanAddress, KeyDerivation keyDerivation, boolean addKeyOrigin, boolean addKey, boolean useApostrophes) {
+        StringBuilder keyBuilder = new StringBuilder();
+        if(addKeyOrigin && keyDerivation != null && keyDerivation.getMasterFingerprint() != null && keyDerivation.getMasterFingerprint().length() == 8 && Utils.isHex(keyDerivation.getMasterFingerprint())) {
+            keyBuilder.append("[");
+            keyBuilder.append(keyDerivation.getMasterFingerprint());
+            if(!keyDerivation.getDerivation().isEmpty()) {
+                keyBuilder.append(KeyDerivation.writePath(keyDerivation.getDerivation(), useApostrophes).substring(1));
+            }
+            keyBuilder.append("]");
+        }
+        if(addKey) {
+            keyBuilder.append(spScanAddress.toKeyString());
+        }
+
+        return keyBuilder.toString();
+    }
+
+    public static String writeKey(ECKey ecKey, KeyDerivation keyDerivation, boolean addKeyOrigin, boolean addKey) {
+        return writeKey(ecKey, keyDerivation, addKeyOrigin, addKey, false);
+    }
+
+    public static String writeKey(ECKey ecKey, KeyDerivation keyDerivation, boolean addKeyOrigin, boolean addKey, boolean useApostrophes) {
+        StringBuilder keyBuilder = new StringBuilder();
+        if(addKeyOrigin && keyDerivation != null && keyDerivation.getMasterFingerprint() != null && keyDerivation.getMasterFingerprint().length() == 8 && Utils.isHex(keyDerivation.getMasterFingerprint())) {
+            keyBuilder.append("[");
+            keyBuilder.append(keyDerivation.getMasterFingerprint());
+            if(!keyDerivation.getDerivation().isEmpty()) {
+                keyBuilder.append(KeyDerivation.writePath(keyDerivation.getDerivation(), useApostrophes).substring(1));
+            }
+            keyBuilder.append("]");
+        }
+        if(addKey) {
+            keyBuilder.append(ecKey.hasPrivKey() ? ecKey.getPrivateKeyEncoded().toString() : Utils.bytesToHex(ecKey.getPubKey()));
+        }
+
+        return keyBuilder.toString();
+    }
+
     public static String writeKey(ExtendedKey pubKey, KeyDerivation keyDerivation, String childDerivation, boolean addKeyOrigin, boolean addKey) {
+        return writeKey(pubKey, keyDerivation, childDerivation, addKeyOrigin, addKey, false);
+    }
+
+    public static String writeKey(ExtendedKey pubKey, KeyDerivation keyDerivation, String childDerivation, boolean addKeyOrigin, boolean addKey, boolean useApostrophes) {
         StringBuilder keyBuilder = new StringBuilder();
         if(keyDerivation != null && keyDerivation.getMasterFingerprint() != null && keyDerivation.getMasterFingerprint().length() == 8 && Utils.isHex(keyDerivation.getMasterFingerprint()) && addKeyOrigin) {
             keyBuilder.append("[");
             keyBuilder.append(keyDerivation.getMasterFingerprint());
             if(!keyDerivation.getDerivation().isEmpty()) {
-                keyBuilder.append(keyDerivation.getDerivationPath().replaceFirst("^m?/", "/").replace('\'', 'h'));
+                String path = KeyDerivation.writePath(KeyDerivation.parsePath(keyDerivation.getDerivationPath()), useApostrophes).substring(1);
+                keyBuilder.append(path);
             }
             keyBuilder.append("]");
         }
@@ -649,4 +1037,44 @@ public class OutputDescriptor {
 
         return keyBuilder.toString();
     }
+
+    @Override
+    public final boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(!(o instanceof OutputDescriptor that)) {
+            return false;
+        }
+
+        return toString().equals(that.toString());
+    }
+
+    @Override
+    public int hashCode() {
+        return toString().hashCode();
+    }
+
+    public OutputDescriptor copy(boolean includeChildDerivations) {
+        if(isSilentPayments()) {
+            return new OutputDescriptor(new LinkedHashMap<>(silentPaymentScanAddresses), new LinkedHashMap<>(mapSilentPaymentLabels), new LinkedHashMap<>(annotations));
+        }
+
+        Map<ExtendedKey, KeyDerivation> copyExtendedPublicKeys = new LinkedHashMap<>(extendedPublicKeys);
+        Map<ExtendedKey, String> copyChildDerivations = new LinkedHashMap<>(mapChildrenDerivations);
+        Map<ExtendedKey, String> copyExtendedPublicKeyLabels = new LinkedHashMap<>(mapExtendedPublicKeyLabels);
+        Map<ExtendedKey, ExtendedKey> copyExtendedMasterPrivateKeys = new LinkedHashMap<>(extendedMasterPrivateKeys);
+        Map<String, Integer> copyAnnotations = new LinkedHashMap<>(annotations);
+
+        if(!includeChildDerivations) {
+            //Ensure consistent xpub order by sorting on the first receive address
+            Map<ExtendedKey, String> childDerivations = copyExtendedPublicKeys.entrySet().stream().collect(Collectors.toMap(Map.Entry::getKey, _ -> "/0/0"));
+            OutputDescriptor copyFirstReceive = new OutputDescriptor(scriptType, multisigThreshold, copyExtendedPublicKeys, childDerivations);
+            OutputDescriptor copySortedXpubs = OutputDescriptor.getOutputDescriptor(copyFirstReceive.toString());
+
+            return new OutputDescriptor(scriptType, multisigThreshold, copySortedXpubs.extendedPublicKeys, Collections.emptyMap(), copyExtendedPublicKeyLabels, copyExtendedMasterPrivateKeys, copyAnnotations);
+        }
+
+        return new OutputDescriptor(scriptType, multisigThreshold, copyExtendedPublicKeys, copyChildDerivations, copyExtendedPublicKeyLabels, copyExtendedMasterPrivateKeys, copyAnnotations);
+    }
 }

src/main/java/com/sparrowwallet/drongo/Utils.java

@@ -4,6 +4,8 @@ import com.sparrowwallet.drongo.crypto.*;
 import com.sparrowwallet.drongo.protocol.ProtocolException;
 import com.sparrowwallet.drongo.protocol.Ripemd160;
 import com.sparrowwallet.drongo.protocol.Sha256Hash;
+import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
+import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
 import org.bouncycastle.crypto.digests.SHA512Digest;
 import org.bouncycastle.crypto.macs.HMac;
 import org.bouncycastle.crypto.params.KeyParameter;
@@ -12,9 +14,13 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.math.BigInteger;
+import java.net.URI;
 import java.nio.ByteBuffer;
 import java.nio.charset.CharsetDecoder;
 import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.spec.PKCS8EncodedKeySpec;
 import java.util.*;
 
 public class Utils {
@@ -47,6 +53,56 @@ public class Utils {
         }
     }
 
+    public static boolean isHex(byte[] bytes) {
+        if(bytes == null || bytes.length == 0) {
+            return false;
+        }
+
+        for(byte b : trim(bytes)) {
+            if(!((b >= '0' && b <= '9') || (b >= 'A' && b <= 'F') || (b >= 'a' && b <= 'f'))) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    public static boolean isBase64(byte[] bytes) {
+        if(bytes == null || bytes.length == 0) {
+            return false;
+        }
+
+        for(byte b : trim(bytes)) {
+            if(!((b >= '0' && b <= '9') || (b >= 'A' && b <= 'Z') || (b >= 'a' && b <= 'z') || (b == '+') || (b == '/') || (b == '='))) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    private static byte[] trim(byte[] bytes) {
+        int len = bytes.length;
+        int st = 0;
+        while ((st < len) && Character.isWhitespace((bytes[st] & 0xff))) {
+            st++;
+        }
+        while ((st < len) && Character.isWhitespace((bytes[len - 1] & 0xff))) {
+            len--;
+        }
+
+        return ((st > 0) || (len < bytes.length)) ? Arrays.copyOfRange(bytes, st, len) : bytes;
+    }
+
+    public static boolean isSecureUrl(URI uri) {
+        if(uri == null || uri.getScheme() == null || uri.getHost() == null) {
+            return false;
+        }
+
+        String scheme = uri.getScheme().toLowerCase(Locale.ROOT);
+        return "https".equals(scheme) || ("http".equals(scheme) && uri.getHost().toLowerCase(Locale.ROOT).endsWith(".onion"));
+    }
+
     public static String bytesToHex(byte[] bytes) {
         char[] hexChars = new char[bytes.length * 2];
         for ( int j = 0; j < bytes.length; j++ ) {
@@ -338,6 +394,21 @@ public class Utils {
         return Sha256Hash.hash(buffer.array());
     }
 
+    public static byte[] getRawKeyBytesFromPKCS8(PrivateKey pkcs8Key) {
+        try {
+            PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pkcs8Key.getEncoded());
+            PrivateKeyInfo privateKeyInfo = PrivateKeyInfo.getInstance(keySpec.getEncoded());
+            return privateKeyInfo.parsePrivateKey().toASN1Primitive().getEncoded();
+        } catch(IOException e) {
+            throw new IllegalArgumentException("Error parsing private key", e);
+        }
+    }
+
+    public static byte[] getRawKeyBytesFromX509(PublicKey x509Key) {
+        SubjectPublicKeyInfo spki = SubjectPublicKeyInfo.getInstance(x509Key.getEncoded());
+        return spki.getPublicKeyData().getBytes();
+    }
+
     public static class LexicographicByteArrayComparator implements Comparator<byte[]> {
         @Override
         public int compare(byte[] left, byte[] right) {

src/main/java/com/sparrowwallet/drongo/Version.java

@@ -0,0 +1,55 @@
+package com.sparrowwallet.drongo;
+
+public class Version implements Comparable<Version> {
+    private final String version;
+
+    public final String get() {
+        return this.version;
+    }
+
+    public Version(String version) {
+        if(version == null) {
+            throw new IllegalArgumentException("Version can not be null");
+        }
+        version = version.replaceAll("[^0-9.].*", "");
+        if(!version.matches("[0-9]+(\\.[0-9]+)*")) {
+            throw new IllegalArgumentException("Invalid version format");
+        }
+        this.version = version;
+    }
+
+    @Override
+    public int compareTo(Version that) {
+        if(that == null) {
+            return 1;
+        }
+        String[] thisParts = this.get().split("\\.");
+        String[] thatParts = that.get().split("\\.");
+        int length = Math.max(thisParts.length, thatParts.length);
+        for(int i = 0; i < length; i++) {
+            int thisPart = i < thisParts.length ? Integer.parseInt(thisParts[i]) : 0;
+            int thatPart = i < thatParts.length ? Integer.parseInt(thatParts[i]) : 0;
+            if(thisPart < thatPart) {
+                return -1;
+            }
+            if(thisPart > thatPart) {
+                return 1;
+            }
+        }
+        return 0;
+    }
+
+    @Override
+    public boolean equals(Object that) {
+        if(this == that) {
+            return true;
+        }
+        if(that == null) {
+            return false;
+        }
+        if(this.getClass() != that.getClass()) {
+            return false;
+        }
+        return this.compareTo((Version) that) == 0;
+    }
+}

src/main/java/com/sparrowwallet/drongo/address/Address.java

@@ -59,11 +59,11 @@ public abstract class Address {
             return false;
         }
 
-        return Arrays.equals(data, address.data) && getVersion(Network.get()) == address.getVersion(Network.get());
+        return Arrays.equals(data, address.data) && getVersion(Network.get()) == address.getVersion(Network.get()) && getScriptType() == address.getScriptType();
     }
 
     public int hashCode() {
-        return Arrays.hashCode(data) + getVersion(Network.get());
+        return Arrays.hashCode(data) + getVersion(Network.get()) + getScriptType().hashCode();
     }
 
     public static Address fromString(String address) throws InvalidAddressException {
@@ -134,6 +134,8 @@ public abstract class Address {
                             byte[] witnessProgram = Bech32.convertBits(convertedProgram, 0, convertedProgram.length, 5, 8, false);
                             if(witnessProgram.length == 32) {
                                 return new P2TRAddress(witnessProgram);
+                            } else if(Arrays.equals(witnessProgram, ScriptType.ANCHOR_WITNESS_PROGRAM)) {
+                                return new P2AAddress(witnessProgram);
                             }
                         }
                     }

src/main/java/com/sparrowwallet/drongo/address/P2AAddress.java

@@ -0,0 +1,31 @@
+package com.sparrowwallet.drongo.address;
+
+import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.drongo.protocol.Bech32;
+import com.sparrowwallet.drongo.protocol.ScriptType;
+
+public class P2AAddress extends Address {
+    public P2AAddress(byte[] data) {
+        super(data);
+    }
+
+    @Override
+    public int getVersion(Network network) {
+        return 1;
+    }
+
+    @Override
+    public String getAddress(Network network) {
+        return Bech32.encode(network.getBech32AddressHRP(), getVersion(), data);
+    }
+
+    @Override
+    public ScriptType getScriptType() {
+        return ScriptType.P2A;
+    }
+
+    @Override
+    public String getOutputScriptDataType() {
+        return "Anchor";
+    }
+}

src/main/java/com/sparrowwallet/drongo/bip47/PaymentCode.java

@@ -5,6 +5,7 @@ import com.sparrowwallet.drongo.crypto.ChildNumber;
 import com.sparrowwallet.drongo.crypto.DeterministicKey;
 import com.sparrowwallet.drongo.crypto.ECKey;
 import com.sparrowwallet.drongo.crypto.HDKeyDerivation;
+import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.*;
 import com.sparrowwallet.drongo.wallet.Keystore;
 import org.slf4j.Logger;
@@ -82,7 +83,7 @@ public class PaymentCode {
     }
 
     public Address getNotificationAddress() {
-        return ScriptType.P2PKH.getAddress(getNotificationKey());
+        return ScriptType.P2PKH.getAddress(PolicyType.SINGLE_HD, getNotificationKey());
     }
 
     public ECKey getKey(int index) {

src/main/java/com/sparrowwallet/drongo/crypto/Bip322.java

@@ -1,12 +1,12 @@
 package com.sparrowwallet.drongo.crypto;
 
+import com.sparrowwallet.drongo.KeyDerivation;
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.*;
 import com.sparrowwallet.drongo.psbt.PSBT;
 import com.sparrowwallet.drongo.psbt.PSBTInput;
-import com.sparrowwallet.drongo.psbt.PSBTInputSigner;
 import com.sparrowwallet.drongo.psbt.PSBTSignatureException;
 
 import java.nio.charset.StandardCharsets;
@@ -16,41 +16,117 @@ import java.util.*;
 import static com.sparrowwallet.drongo.protocol.ScriptType.P2TR;
 
 public class Bip322 {
+    public static final String SIMPLE_PREFIX = "smp";
+    public static final String FULL_PREFIX = "ful";
+    public static final String FULL_POF_PREFIX = "pof";
+
     public static String signMessageBip322(ScriptType scriptType, String message, ECKey privKey) {
         checkScriptType(scriptType);
 
         ECKey pubKey = ECKey.fromPublicOnly(privKey);
-        Address address = scriptType.getAddress(pubKey);
+        Address address = scriptType.getAddress(PolicyType.SINGLE_HD, pubKey);
+
+        PSBT psbt = getBip322Psbt(scriptType, address, message);
+        PSBTInput psbtInput = psbt.getPsbtInputs().getFirst();
+        psbtInput.sign(scriptType.getOutputKey(PolicyType.SINGLE_HD, privKey));
+
+        return getBip322SignatureFromPsbt(scriptType, psbt, pubKey);
+    }
+
+    public static PSBT getBip322Psbt(ScriptType scriptType, Address address, String message) {
+        checkScriptType(scriptType);
 
         Transaction toSpend = getBip322ToSpend(address, message);
         Transaction toSign = getBip322ToSign(toSpend);
-
-        TransactionOutput utxoOutput = toSpend.getOutputs().get(0);
+        TransactionOutput utxoOutput = toSpend.getOutputs().getFirst();
 
         PSBT psbt = new PSBT(toSign);
-        PSBTInput psbtInput = psbt.getPsbtInputs().get(0);
+        psbt.setGenericSignedMessage(message);
+        PSBTInput psbtInput = psbt.getPsbtInputs().getFirst();
         psbtInput.setWitnessUtxo(utxoOutput);
         psbtInput.setSigHash(SigHash.ALL);
-        psbtInput.sign(scriptType.getOutputKey(privKey));
 
-        TransactionSignature signature = psbtInput.isTaproot() ? psbtInput.getTapKeyPathSignature() : psbtInput.getPartialSignature(pubKey);
+        return psbt;
+    }
+
+    public static PSBT getBip322PsbtSp(Address address, String message, byte[] silentPaymentsTweak, Map<ECKey, KeyDerivation> spendDerivations) {
+        if(silentPaymentsTweak == null) {
+            throw new IllegalArgumentException("Silent payments tweak is required");
+        }
+
+        PSBT psbt = getBip322Psbt(P2TR, address, message);
+        PSBTInput psbtInput = psbt.getPsbtInputs().getFirst();
+        psbtInput.setSilentPaymentsTweak(silentPaymentsTweak);
+        if(spendDerivations != null && !spendDerivations.isEmpty()) {
+            psbtInput.getSilentPaymentsSpendDerivations().putAll(spendDerivations);
+        }
+
+        return psbt;
+    }
+
+    public static String signMessageBip322Sp(Address address, String message, ECKey spendPrivKey, byte[] silentPaymentsTweak) {
+        PSBT psbt = getBip322PsbtSp(address, message, silentPaymentsTweak, Collections.emptyMap());
+        PSBTInput psbtInput = psbt.getPsbtInputs().getFirst();
+
+        if(!psbtInput.signSilentPayments(spendPrivKey)) {
+            throw new IllegalStateException("Failed to sign BIP322 PSBT with silent payments tweak");
+        }
+
+        return getBip322SignatureFromPsbtSp(psbt);
+    }
+
+    public static String getBip322SignatureFromPsbtSp(PSBT signedPsbt) {
+        PSBTInput psbtInput = signedPsbt.getPsbtInputs().getFirst();
+        TransactionSignature signature = psbtInput.getTapKeyPathSignature();
+        if(signature == null) {
+            throw new IllegalArgumentException("PSBT does not contain a taproot keypath signature");
+        }
 
         Transaction finalizeTransaction = new Transaction();
-        TransactionInput finalizedTxInput = scriptType.addSpendingInput(finalizeTransaction, utxoOutput, pubKey, signature);
+        TransactionWitness witness = new TransactionWitness(finalizeTransaction, signature);
+        finalizeTransaction.addInput(Sha256Hash.ZERO_HASH, 0, new Script(new byte[0]), witness);
 
-        return Base64.getEncoder().encodeToString(finalizedTxInput.getWitness().toByteArray());
+        return SIMPLE_PREFIX + Base64.getEncoder().encodeToString(witness.toByteArray());
+    }
+
+    public static String getBip322SignatureFromPsbt(ScriptType scriptType, PSBT signedPsbt, ECKey pubKey) {
+        checkScriptType(scriptType);
+
+        PSBTInput psbtInput = signedPsbt.getPsbtInputs().getFirst();
+        TransactionSignature signature = psbtInput.isTaproot() ? psbtInput.getTapKeyPathSignature() : psbtInput.getPartialSignature(pubKey);
+
+        if(signature == null) {
+            throw new IllegalArgumentException("PSBT does not contain a signature");
+        }
+
+        TransactionOutput utxoOutput = psbtInput.getWitnessUtxo();
+        Transaction finalizeTransaction = new Transaction();
+        Script scriptSig = scriptType.getScriptSig(PolicyType.SINGLE_HD, utxoOutput.getScript(), pubKey, signature);
+        TransactionWitness witness = psbtInput.isTaproot() ? new TransactionWitness(finalizeTransaction, signature) : new TransactionWitness(finalizeTransaction, pubKey, signature);
+        TransactionInput finalizedTxInput = finalizeTransaction.addInput(Sha256Hash.ZERO_HASH, 0, scriptSig, witness);
+
+        return SIMPLE_PREFIX + Base64.getEncoder().encodeToString(finalizedTxInput.getWitness().toByteArray());
     }
 
     public static boolean verifyMessageBip322(ScriptType scriptType, Address address, String message, String signatureBase64) throws SignatureException {
         checkScriptType(scriptType);
 
-        if(signatureBase64.trim().isEmpty()) {
+        String trimmed = signatureBase64.trim();
+        if(trimmed.isEmpty()) {
             throw new SignatureException("Provided signature is empty.");
         }
 
+        if(trimmed.startsWith(FULL_PREFIX) || trimmed.startsWith(FULL_POF_PREFIX)) {
+            throw new SignatureException("Only the simple BIP322 signature variant is supported.");
+        }
+
+        if(trimmed.startsWith(SIMPLE_PREFIX)) {
+            trimmed = trimmed.substring(SIMPLE_PREFIX.length());
+        }
+
         byte[] signatureEncoded;
         try {
-            signatureEncoded = Base64.getDecoder().decode(signatureBase64);
+            signatureEncoded = Base64.getDecoder().decode(trimmed);
         } catch(IllegalArgumentException e) {
             throw new SignatureException("Could not decode base64 signature", e);
         }
@@ -74,17 +150,17 @@ public class Bip322 {
         }
 
         if(scriptType == ScriptType.P2WPKH) {
-            signature = witness.getSignatures().get(0);
+            signature = witness.getSignatures().getFirst();
             if(witness.getPushes().size() <= 1) {
                 throw new SignatureException("BIP322 simple signature for P2WPKH script type does not contain a pubkey.");
             }
             pubKey = ECKey.fromPublicOnly(witness.getPushes().get(1));
 
-            if(!address.equals(scriptType.getAddress(pubKey))) {
+            if(!address.equals(scriptType.getAddress(PolicyType.SINGLE_HD, pubKey))) {
                 throw new SignatureException("Provided address does not match pubkey in signature");
             }
         } else if(scriptType == ScriptType.P2TR) {
-            signature = witness.getSignatures().get(0);
+            signature = witness.getSignatures().getFirst();
             pubKey = P2TR.getPublicKeyFromScript(address.getOutputScript());
         } else {
             throw new SignatureException(scriptType + " addresses are not supported");
@@ -94,8 +170,8 @@ public class Bip322 {
         Transaction toSign = getBip322ToSign(toSpend);
 
         PSBT psbt = new PSBT(toSign);
-        PSBTInput psbtInput = psbt.getPsbtInputs().get(0);
-        psbtInput.setWitnessUtxo(toSpend.getOutputs().get(0));
+        PSBTInput psbtInput = psbt.getPsbtInputs().getFirst();
+        psbtInput.setWitnessUtxo(toSpend.getOutputs().getFirst());
         psbtInput.setSigHash(SigHash.ALL);
 
         if(scriptType == ScriptType.P2TR) {
@@ -114,7 +190,7 @@ public class Bip322 {
     }
 
     private static void checkScriptType(ScriptType scriptType) {
-        if(!scriptType.isAllowed(PolicyType.SINGLE)) {
+        if(!scriptType.isAllowed(PolicyType.SINGLE_HD)) {
             throw new UnsupportedOperationException("Only singlesig addresses are currently supported");
         }
 
@@ -141,7 +217,7 @@ public class Bip322 {
         scriptSigChunks.add(ScriptChunk.fromData(getBip322MessageHash(message)));
         Script scriptSig = new Script(scriptSigChunks);
         toSpend.addInput(Sha256Hash.ZERO_HASH, 0xFFFFFFFFL, scriptSig, new TransactionWitness(toSpend, Collections.emptyList()));
-        toSpend.getInputs().get(0).setSequenceNumber(0L);
+        toSpend.getInputs().getFirst().setSequenceNumber(0L);
         toSpend.addOutput(0L, address.getOutputScript());
 
         return toSpend;
@@ -154,7 +230,7 @@ public class Bip322 {
 
         TransactionWitness witness = new TransactionWitness(toSign);
         toSign.addInput(toSpend.getTxId(), 0L, new Script(new byte[0]), witness);
-        toSign.getInputs().get(0).setSequenceNumber(0L);
+        toSign.getInputs().getFirst().setSequenceNumber(0L);
         toSign.addOutput(0, new Script(List.of(ScriptChunk.fromOpcode(ScriptOpCodes.OP_RETURN))));
 
         return toSign;

src/main/java/com/sparrowwallet/drongo/crypto/ChildNumber.java

@@ -30,7 +30,7 @@ public class ChildNumber {
         this.i = i;
     }
 
-    private static boolean hasHardenedBit(int a) {
+    public static boolean hasHardenedBit(int a) {
         return (a & HARDENED_BIT) != 0;
     }
 

src/main/java/com/sparrowwallet/drongo/crypto/DLEQProof.java

@@ -0,0 +1,218 @@
+package com.sparrowwallet.drongo.crypto;
+
+import com.sparrowwallet.drongo.Utils;
+import org.bouncycastle.math.ec.ECPoint;
+
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+
+/**
+ * Implementation of BIP-374 Discrete Log Equality Proofs.
+ *
+ * This class provides methods to generate and verify zero-knowledge DLEQ proofs
+ * that prove knowledge of a scalar a such that A = a⋅G and C = a⋅B without
+ * revealing the value of a.
+ */
+public class DLEQProof {
+    private static final String DLEQ_TAG_AUX = "BIP0374/aux";
+    private static final String DLEQ_TAG_NONCE = "BIP0374/nonce";
+    private static final String DLEQ_TAG_CHALLENGE = "BIP0374/challenge";
+
+    /**
+     * Generate a DLEQ proof according to BIP-374.
+     *
+     * @param a The secret key (256-bit unsigned integer)
+     * @param B The public key point on the curve
+     * @param r Auxiliary random data (32 bytes)
+     * @param G The generator point (if null, uses secp256k1 generator)
+     * @param m Optional message (32 bytes or null)
+     * @return The proof (64 bytes) or null if generation fails
+     * @throws IllegalArgumentException if r is not 32 bytes or m is not 32 bytes (when provided)
+     */
+    public static byte[] generateProof(BigInteger a, ECKey B, byte[] r, ECKey G, byte[] m) {
+        if(r.length != 32) {
+            throw new IllegalArgumentException("Auxiliary random data must be 32 bytes");
+        }
+
+        // Fail if a = 0 or a >= n
+        if(a.equals(BigInteger.ZERO) || a.compareTo(ECKey.CURVE.getN()) >= 0) {
+            return null;
+        }
+
+        // Fail if is_infinite(B)
+        if(B.getPubKeyPoint().isInfinity()) {
+            return null;
+        }
+
+        if(m != null && m.length != 32) {
+            throw new IllegalArgumentException("Message must be 32 bytes");
+        }
+
+        // Use secp256k1 generator if G is null
+        if(G == null) {
+            G = ECKey.fromPublicOnly(ECKey.CURVE.getG(), true);
+        }
+
+        // Let A = a⋅G
+        ECKey A = G.multiply(a, true);
+
+        // Let C = a⋅B
+        ECKey C = B.multiply(a, true);
+
+        // Let t be the byte-wise xor of bytes(32, a) and hash_BIP0374/aux(r)
+        byte[] aBytes = Utils.bigIntegerToBytes(a, 32);
+        byte[] auxHash = Utils.taggedHash(DLEQ_TAG_AUX, r);
+        byte[] t = Utils.xor(aBytes, auxHash);
+
+        // Let m' = m if m is provided, otherwise an empty byte array
+        byte[] mPrime = (m == null) ? new byte[0] : m;
+
+        // Let rand = hash_BIP0374/nonce(t || cbytes(A) || cbytes(C) || m')
+        ByteBuffer nonceBuffer = ByteBuffer.allocate(t.length + 33 + 33 + mPrime.length);
+        nonceBuffer.put(t);
+        nonceBuffer.put(A.getPubKey());
+        nonceBuffer.put(C.getPubKey());
+        nonceBuffer.put(mPrime);
+        byte[] rand = Utils.taggedHash(DLEQ_TAG_NONCE, nonceBuffer.array());
+
+        // Let k = int(rand) mod n
+        BigInteger k = new BigInteger(1, rand).mod(ECKey.CURVE.getN());
+
+        // Fail if k = 0
+        if(k.equals(BigInteger.ZERO)) {
+            return null;
+        }
+
+        // Let R1 = k⋅G
+        ECKey R1 = G.multiply(k, true);
+
+        // Let R2 = k⋅B
+        ECKey R2 = B.multiply(k, true);
+
+        // Let e = int(hash_BIP0374/challenge(...))
+        BigInteger e = dleqChallenge(A, B, C, R1, R2, m, G);
+
+        // Let s = (k + e⋅a) mod n
+        BigInteger s = k.add(e.multiply(a)).mod(ECKey.CURVE.getN());
+
+        // Let proof = bytes(32, e) || bytes(32, s)
+        byte[] proof = new byte[64];
+        byte[] eBytes = Utils.bigIntegerToBytes(e, 32);
+        byte[] sBytes = Utils.bigIntegerToBytes(s, 32);
+        System.arraycopy(eBytes, 0, proof, 0, 32);
+        System.arraycopy(sBytes, 0, proof, 32, 32);
+
+        // If VerifyProof fails, abort
+        if(!verifyProof(A, B, C, proof, G, m)) {
+            return null;
+        }
+
+        return proof;
+    }
+
+    /**
+     * Verify a DLEQ proof according to BIP-374.
+     *
+     * @param A The public key of the secret key used in proof generation
+     * @param B The public key used in proof generation
+     * @param C The result of multiplying the secret and public keys (a⋅B)
+     * @param proof The proof (64 bytes)
+     * @param G The generator point (if null, uses secp256k1 generator)
+     * @param m Optional message (32 bytes or null)
+     * @return true if the proof is valid, false otherwise
+     * @throws IllegalArgumentException if m is not 32 bytes (when provided)
+     */
+    public static boolean verifyProof(ECKey A, ECKey B, ECKey C, byte[] proof, ECKey G, byte[] m) {
+        // Fail if any of is_infinite(A), is_infinite(B), is_infinite(C), is_infinite(G)
+        if(A.getPubKeyPoint().isInfinity() || B.getPubKeyPoint().isInfinity() ||
+           C.getPubKeyPoint().isInfinity()) {
+            return false;
+        }
+
+        if(proof.length != 64) {
+            return false;
+        }
+
+        if(m != null && m.length != 32) {
+            throw new IllegalArgumentException("Message must be 32 bytes");
+        }
+
+        // Use secp256k1 generator if G is null
+        if(G == null) {
+            G = ECKey.fromPublicOnly(ECKey.CURVE.getG(), true);
+        }
+
+        if(G.getPubKeyPoint().isInfinity()) {
+            return false;
+        }
+
+        // Let e = int(proof[0:32])
+        byte[] eBytes = new byte[32];
+        System.arraycopy(proof, 0, eBytes, 0, 32);
+        BigInteger e = new BigInteger(1, eBytes);
+
+        // Let s = int(proof[32:64]); fail if s >= n
+        byte[] sBytes = new byte[32];
+        System.arraycopy(proof, 32, sBytes, 0, 32);
+        BigInteger s = new BigInteger(1, sBytes);
+        if(s.compareTo(ECKey.CURVE.getN()) >= 0) {
+            return false;
+        }
+
+        // Let R1 = s⋅G - e⋅A
+        ECPoint R1Point = G.getPubKeyPoint().multiply(s).add(A.getPubKeyPoint().multiply(e).negate()).normalize();
+
+        // Fail if is_infinite(R1)
+        if(R1Point.isInfinity()) {
+            return false;
+        }
+
+        ECKey R1 = ECKey.fromPublicOnly(R1Point, true);
+
+        // Let R2 = s⋅B - e⋅C
+        ECPoint R2Point = B.getPubKeyPoint().multiply(s).add(C.getPubKeyPoint().multiply(e).negate()).normalize();
+
+        // Fail if is_infinite(R2)
+        if(R2Point.isInfinity()) {
+            return false;
+        }
+
+        ECKey R2 = ECKey.fromPublicOnly(R2Point, true);
+
+        // Fail if e ≠ int(hash_BIP0374/challenge(...))
+        BigInteger eExpected = dleqChallenge(A, B, C, R1, R2, m, G);
+        if(!e.equals(eExpected)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Calculate the DLEQ challenge hash according to BIP-374.
+     *
+     * @param A The public key A = a⋅G
+     * @param B The public key B
+     * @param C The shared secret C = a⋅B
+     * @param R1 The first commitment R1 = k⋅G
+     * @param R2 The second commitment R2 = k⋅B
+     * @param m Optional message (32 bytes or null)
+     * @param G The generator point
+     * @return The challenge value e
+     */
+    private static BigInteger dleqChallenge(ECKey A, ECKey B, ECKey C, ECKey R1, ECKey R2, byte[] m, ECKey G) {
+        byte[] mPrime = (m == null) ? new byte[0] : m;
+
+        ByteBuffer challengeBuffer = ByteBuffer.allocate(33 + 33 + 33 + 33 + 33 + 33 + mPrime.length);
+        challengeBuffer.put(A.getPubKey());
+        challengeBuffer.put(B.getPubKey());
+        challengeBuffer.put(C.getPubKey());
+        challengeBuffer.put(G.getPubKey());
+        challengeBuffer.put(R1.getPubKey());
+        challengeBuffer.put(R2.getPubKey());
+        challengeBuffer.put(mPrime);
+
+        byte[] hash = Utils.taggedHash(DLEQ_TAG_CHALLENGE, challengeBuffer.array());
+        return new BigInteger(1, hash);
+    }
+}

src/main/java/com/sparrowwallet/drongo/crypto/ECKey.java

@@ -326,6 +326,68 @@ public class ECKey {
         return pub.get();
     }
 
+    /** Returns true if the Y coordinate of the public key is odd. */
+    public boolean hasOddYCoord() {
+        return pub.hasOddYCoord();
+    }
+
+    /** Multiply the public point by the provided private key */
+    public ECKey multiply(BigInteger privKey) {
+        return multiply(privKey, false);
+    }
+
+    /** Multiply the public point by the provided private key */
+    public ECKey multiply(BigInteger privKey, boolean compressed) {
+        ECPoint point = pub.get().multiply(privKey);
+        return ECKey.fromPublicOnly(point, compressed);
+    }
+
+    /** Add to the public point by the provided public key */
+    public ECKey add(ECKey pubKey) {
+        return add(pubKey, false);
+    }
+
+    /** Add to the public point by the provided public key */
+    public ECKey add(ECKey pubKey, boolean compressed) {
+        ECPoint point = pub.get().add(pubKey.getPubKeyPoint());
+        return ECKey.fromPublicOnly(point, compressed);
+    }
+
+    /** Negate the provided public key */
+    public ECKey negate() {
+        return ECKey.fromPublicOnly(getPubKeyPoint().negate().normalize(), isCompressed());
+    }
+
+    /** Add to the private key by the provided private key using modular arithmetic */
+    public ECKey addPrivate(ECKey privKey) {
+        return addPrivate(privKey, true);
+    }
+
+    /** Add to the private key by the provided private key using modular arithmetic */
+    public ECKey addPrivate(ECKey privKey, boolean compressed) {
+        if(this.priv == null || privKey.priv == null) {
+            throw new IllegalStateException("Key did not contain a private key");
+        }
+
+        return ECKey.fromPrivate(this.priv.add(privKey.priv).mod(CURVE.getN()), compressed);
+    }
+
+    /** Negate the provided private key */
+    public ECKey negatePrivate() {
+        if(priv == null) {
+            throw new IllegalStateException("Key did not contain a private key");
+        }
+
+        BigInteger negatedPrivKey = CURVE.getN().subtract(priv);
+        return ECKey.fromPrivate(negatedPrivKey, isCompressed());
+    }
+
+    /** Calculate the value of the public key point modulo the secp256k1 curve order */
+    public BigInteger moduloCurveOrder() {
+        BigInteger xCoordinate = pub.get().normalize().getAffineXCoord().toBigInteger();
+        return xCoordinate.mod(CURVE_PARAMS.getCurve().getOrder());
+    }
+
     /**
      * Gets the private key in the form of an integer field element. The public key is derived by performing EC
      * point addition this number of times (i.e. point multiplying).
@@ -435,53 +497,20 @@ public class ECKey {
         return verify(sigHash.getBytes(), signature);
     }
 
+    /**
+     * Tweak the key for use as a Taproot output key (without script path) as defined in BIP341
+     */
     public ECKey getTweakedOutputKey() {
-        TaprootPubKey taprootPubKey = liftX(getPubKeyXCoord());
-        ECPoint internalKey = taprootPubKey.ecPoint;
-        byte[] taggedHash = Utils.taggedHash("TapTweak", internalKey.getXCoord().getEncoded());
-        ECKey tweakValue = ECKey.fromPrivate(taggedHash);
-        ECPoint outputKey = internalKey.add(tweakValue.getPubKeyPoint());
+        ECKey key = this;
 
-        if(hasPrivKey()) {
-            BigInteger taprootPriv = priv;
-            BigInteger tweakedPrivKey = taprootPriv.add(tweakValue.getPrivKey()).mod(CURVE_PARAMS.getCurve().getOrder());
-            //TODO: Improve on this hack. How do we know whether to negate the private key before tweaking it?
-            if(!ECKey.fromPrivate(tweakedPrivKey).getPubKeyPoint().equals(outputKey)) {
-                taprootPriv = CURVE_PARAMS.getCurve().getOrder().subtract(priv);
-                tweakedPrivKey = taprootPriv.add(tweakValue.getPrivKey()).mod(CURVE_PARAMS.getCurve().getOrder());
-            }
-
-            return new ECKey(tweakedPrivKey, outputKey, true);
+        if(pub.hasOddYCoord()) {
+            key = hasPrivKey() ? key.negatePrivate() : key.negate();
         }
 
-        return ECKey.fromPublicOnly(outputKey, true);
-    }
+        byte[] tweakHash = Utils.taggedHash("TapTweak", key.getPubKeyXCoord());
+        ECKey tweakKey = ECKey.fromPrivate(tweakHash);
 
-    private static TaprootPubKey liftX(byte[] bytes) {
-        SecP256K1Curve secP256K1Curve = (SecP256K1Curve)CURVE_PARAMS.getCurve();
-        BigInteger x = new BigInteger(1, bytes);
-        BigInteger p = secP256K1Curve.getQ();
-        if(x.compareTo(p) > -1) {
-            throw new IllegalArgumentException("Provided bytes must be less than secp256k1 field size");
-        }
-
-        BigInteger y_sq = x.modPow(BigInteger.valueOf(3), p).add(BigInteger.valueOf(7)).mod(p);
-        BigInteger y = y_sq.modPow(p.add(BigInteger.valueOf(1)).divide(BigInteger.valueOf(4)), p);
-        if(!y.modPow(BigInteger.valueOf(2), p).equals(y_sq)) {
-            throw new IllegalStateException("Calculated invalid y_sq when solving for y co-ordinate");
-        }
-
-        return y.and(BigInteger.ONE).equals(BigInteger.ZERO) ? new TaprootPubKey(secP256K1Curve.createPoint(x, y), false) : new TaprootPubKey(secP256K1Curve.createPoint(x, p.subtract(y)), true);
-    }
-
-    private static class TaprootPubKey {
-        public final ECPoint ecPoint;
-        public final boolean negated;
-
-        public TaprootPubKey(ECPoint ecPoint, boolean negated) {
-            this.ecPoint = ecPoint;
-            this.negated = negated;
-        }
+        return hasPrivKey() ? key.addPrivate(tweakKey, true) : key.add(tweakKey, true);
     }
 
     /**

src/main/java/com/sparrowwallet/drongo/crypto/LazyECPoint.java

@@ -68,6 +68,10 @@ public class LazyECPoint {
         return xcoord;
     }
 
+    public boolean hasOddYCoord() {
+        return get().normalize().getYCoord().toBigInteger().testBit(0);
+    }
+
     public String toString() {
         return Hex.toHexString(getEncoded());
     }

src/main/java/com/sparrowwallet/drongo/crypto/Secp256r1Key.java

@@ -0,0 +1,39 @@
+package com.sparrowwallet.drongo.crypto;
+
+import org.bouncycastle.asn1.x9.ECNamedCurveTable;
+import org.bouncycastle.asn1.x9.X9ECParameters;
+import org.bouncycastle.crypto.params.ECDomainParameters;
+import org.bouncycastle.crypto.params.ECPublicKeyParameters;
+import org.bouncycastle.crypto.signers.ECDSASigner;
+import org.bouncycastle.math.ec.ECPoint;
+
+import java.math.BigInteger;
+
+public class Secp256r1Key {
+    private static final X9ECParameters CURVE_PARAMS = ECNamedCurveTable.getByName("P-256");
+
+    public static final ECDomainParameters CURVE;
+
+    private final ECPoint point;
+
+    static {
+        CURVE = new ECDomainParameters(CURVE_PARAMS.getCurve(), CURVE_PARAMS.getG(), CURVE_PARAMS.getN(), CURVE_PARAMS.getH());
+    }
+
+    public Secp256r1Key(byte[] publicKeyBytes) {
+        this.point = CURVE.getCurve().decodePoint(publicKeyBytes);
+    }
+
+    public boolean verify(byte[] challenge, byte[] challengeSignature) {
+        ECDSASigner signer = new ECDSASigner();
+        signer.init(false, new ECPublicKeyParameters(point, CURVE));
+
+        int halfLength = challengeSignature.length / 2;
+        byte[] r = new byte[halfLength];
+        byte[] s = new byte[halfLength];
+        System.arraycopy(challengeSignature, 0, r, 0, halfLength);
+        System.arraycopy(challengeSignature, halfLength, s, 0, halfLength);
+
+        return signer.verifySignature(challenge, new BigInteger(1, r), new BigInteger(1, s));
+    }
+}

src/main/java/com/sparrowwallet/drongo/crypto/X25519Key.java

@@ -0,0 +1,128 @@
+package com.sparrowwallet.drongo.crypto;
+
+import org.bouncycastle.asn1.ASN1ObjectIdentifier;
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
+import org.bouncycastle.crypto.params.X25519PrivateKeyParameters;
+import org.bouncycastle.crypto.params.X25519PublicKeyParameters;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.security.*;
+import java.security.interfaces.XECPrivateKey;
+import java.security.interfaces.XECPublicKey;
+import java.security.spec.AlgorithmParameterSpec;
+import java.util.Optional;
+
+public class X25519Key {
+    private final KeyPair keyPair;
+    private final AlgorithmParameterSpec ecSpec;
+
+    public X25519Key() {
+        this(generatePrivateKey());
+    }
+
+    public X25519Key(byte[] priv) {
+        try {
+            final KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("X25519");
+            this.ecSpec = keyPairGenerator.generateKeyPair().getPrivate().getParams();
+        } catch(NoSuchAlgorithmException e) {
+            throw new RuntimeException(e);
+        }
+
+        X25519PrivateKeyParameters privateKeyParams = new X25519PrivateKeyParameters(priv, 0);
+        X25519PublicKeyParameters publicKeyParams = privateKeyParams.generatePublicKey();
+
+        PrivateKey privateKey = new BouncyCastlePrivateKey(privateKeyParams);
+        PublicKey publicKey = new BouncyCastlePublicKey(publicKeyParams);
+        this.keyPair = new KeyPair(publicKey, privateKey);
+    }
+
+    public KeyPair getKeyPair() {
+        return keyPair;
+    }
+
+    public byte[] getRawPrivateKeyBytes() {
+        return keyPair.getPrivate().getEncoded();
+    }
+
+    private static byte[] generatePrivateKey() {
+        SecureRandom secureRandom = new SecureRandom();
+        byte[] privateKey = new byte[32];
+        secureRandom.nextBytes(privateKey);
+        return privateKey;
+    }
+
+    public class BouncyCastlePrivateKey implements XECPrivateKey {
+        private final X25519PrivateKeyParameters privateKeyParams;
+
+        BouncyCastlePrivateKey(X25519PrivateKeyParameters privateKeyParams) {
+            this.privateKeyParams = privateKeyParams;
+        }
+
+        @Override
+        public String getAlgorithm() {
+            return "X25519";
+        }
+
+        @Override
+        public String getFormat() {
+            return "RAW";
+        }
+
+        @Override
+        public byte[] getEncoded() {
+            return privateKeyParams.getEncoded();
+        }
+
+        @Override
+        public Optional<byte[]> getScalar() {
+            return Optional.of(getEncoded());
+        }
+
+        @Override
+        public AlgorithmParameterSpec getParams() {
+            return ecSpec;
+        }
+    }
+
+    public class BouncyCastlePublicKey implements XECPublicKey {
+        private final X25519PublicKeyParameters publicKeyParams;
+
+        BouncyCastlePublicKey(X25519PublicKeyParameters publicKeyParams) {
+            this.publicKeyParams = publicKeyParams;
+        }
+
+        @Override
+        public String getAlgorithm() {
+            return "X25519";
+        }
+
+        @Override
+        public String getFormat() {
+            return "X.509";
+        }
+
+        @Override
+        public byte[] getEncoded() {
+            try {
+                ASN1ObjectIdentifier algOid = new ASN1ObjectIdentifier("1.3.101.110");
+                AlgorithmIdentifier algId = new AlgorithmIdentifier(algOid);
+                SubjectPublicKeyInfo spki = new SubjectPublicKeyInfo(algId, publicKeyParams.getEncoded());
+                return spki.getEncoded();
+            } catch(IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+
+        @Override
+        public BigInteger getU() {
+            return new BigInteger(1, publicKeyParams.getEncoded());
+        }
+
+        @Override
+        public AlgorithmParameterSpec getParams() {
+            return ecSpec;
+        }
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/AuthenticatingResolver.java

@@ -0,0 +1,59 @@
+package com.sparrowwallet.drongo.dns;
+
+import org.xbill.DNS.*;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executor;
+
+public class AuthenticatingResolver implements Resolver {
+    private final Resolver delegate;
+    private boolean authenticated;
+
+    public AuthenticatingResolver(Resolver delegate) {
+        this.delegate = delegate;
+    }
+
+    @Override
+    public void setPort(int port) {
+        delegate.setPort(port);
+    }
+
+    @Override
+    public void setTCP(boolean flag) {
+        delegate.setTCP(flag);
+    }
+
+    @Override
+    public void setIgnoreTruncation(boolean flag) {
+        delegate.setIgnoreTruncation(flag);
+    }
+
+    @Override
+    public void setEDNS(int version, int payloadSize, int flags, List<EDNSOption> options) {
+        delegate.setEDNS(version, payloadSize, flags, options);
+    }
+
+    @Override
+    public void setTSIGKey(TSIG key) {
+        delegate.setTSIGKey(key);
+    }
+
+    @Override
+    public void setTimeout(Duration timeout) {
+        delegate.setTimeout(timeout);
+    }
+
+    @Override
+    public CompletionStage<Message> sendAsync(Message query, Executor executor) {
+        return delegate.sendAsync(query, executor).thenApply(response -> {
+            this.authenticated = response.getHeader().getFlag(Flags.AD);
+            return response;
+        });
+    }
+
+    public boolean isAuthenticated() {
+        return authenticated;
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/DnsAddress.java

@@ -0,0 +1,40 @@
+package com.sparrowwallet.drongo.dns;
+
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentAddress;
+
+import java.util.Objects;
+
+public class DnsAddress {
+    private final Address address;
+    private final SilentPaymentAddress silentPaymentAddress;
+
+    public DnsAddress(Address address) {
+        this.address = address;
+        this.silentPaymentAddress = null;
+    }
+
+    public DnsAddress(SilentPaymentAddress silentPaymentAddress) {
+        this.address = null;
+        this.silentPaymentAddress = silentPaymentAddress;
+    }
+
+    @Override
+    public final boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(!(o instanceof DnsAddress that)) {
+            return false;
+        }
+
+        return Objects.equals(address, that.address) && Objects.equals(silentPaymentAddress, that.silentPaymentAddress);
+    }
+
+    @Override
+    public int hashCode() {
+        int result = Objects.hashCode(address);
+        result = 31 * result + Objects.hashCode(silentPaymentAddress);
+        return result;
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/DnsPayment.java

@@ -0,0 +1,58 @@
+package com.sparrowwallet.drongo.dns;
+
+import com.sparrowwallet.drongo.uri.BitcoinURI;
+import org.xbill.DNS.*;
+import org.xbill.DNS.Record;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Optional;
+
+import static com.sparrowwallet.drongo.dns.RecordUtils.fromWire;
+
+public record DnsPayment(String hrn, BitcoinURI bitcoinURI, byte[] proofChain) {
+    public String toString() {
+        return "₿" + hrn;
+    }
+
+    public long getTTL() {
+        long ttl = DnsPaymentCache.MAX_TTL_SECONDS;
+        DNSInput in = new DNSInput(proofChain);
+        while(in.remaining() > 0) {
+            try {
+                Record record = fromWire(in, Section.ANSWER, false);
+                ttl = Math.min(ttl, record.getTTL());
+            } catch(WireParseException e) {
+                //ignore
+            }
+        }
+
+        return ttl;
+    }
+
+    public boolean hasAddress() {
+        return bitcoinURI.getAddress() != null;
+    }
+
+    public boolean hasSilentPaymentAddress() {
+        return bitcoinURI.getSilentPaymentAddress() != null;
+    }
+
+    public static Optional<String> getHrn(String value) {
+        String hrn = value;
+        if(value.endsWith(".")) {
+            return Optional.empty();
+        }
+
+        if(hrn.startsWith("₿")) {
+            hrn = hrn.substring(1);
+        }
+
+        String[] addressParts = hrn.split("@");
+        if(addressParts.length == 2 && addressParts[1].indexOf('.') > -1 && addressParts[1].substring(addressParts[1].indexOf('.') + 1).length() > 1 &&
+                StandardCharsets.US_ASCII.newEncoder().canEncode(hrn)) {
+            return Optional.of(hrn);
+        }
+
+        return Optional.empty();
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/DnsPaymentCache.java

@@ -0,0 +1,69 @@
+package com.sparrowwallet.drongo.dns;
+
+import com.github.benmanes.caffeine.cache.Cache;
+import com.github.benmanes.caffeine.cache.Caffeine;
+import com.github.benmanes.caffeine.cache.Expiry;
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.silentpayments.SilentPayment;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentAddress;
+import com.sparrowwallet.drongo.wallet.Payment;
+
+import java.util.concurrent.TimeUnit;
+
+public class DnsPaymentCache {
+    public static final long MAX_TTL_SECONDS = 604800L;
+    public static final long MIN_TTL_SECONDS = 1800L;
+
+    private static final Cache<DnsAddress, DnsPayment> dnsPayments = Caffeine.newBuilder().expireAfter(new Expiry<DnsAddress, DnsPayment>() {
+        @Override
+        public long expireAfterCreate(DnsAddress address, DnsPayment dnsPayment, long currentTime) {
+            return TimeUnit.SECONDS.toNanos(Math.max(dnsPayment.getTTL(), MIN_TTL_SECONDS));
+        }
+
+        @Override
+        public long expireAfterUpdate(DnsAddress address, DnsPayment dnsPayment, long currentTime, long currentDuration) {
+            return expireAfterCreate(address, dnsPayment, currentTime);
+        }
+
+        @Override
+        public long expireAfterRead(DnsAddress address, DnsPayment dnsPayment, long currentTime, long currentDuration) {
+            return currentDuration;
+        }
+    }).build();
+
+    private DnsPaymentCache() {}
+
+    public static DnsPayment getDnsPayment(Address address) {
+        return dnsPayments.getIfPresent(new DnsAddress(address));
+    }
+
+    public static DnsPayment getDnsPayment(SilentPaymentAddress silentPaymentAddress) {
+        return dnsPayments.getIfPresent(new DnsAddress(silentPaymentAddress));
+    }
+
+    public static DnsPayment getDnsPayment(Payment payment) {
+        if(payment instanceof SilentPayment silentPayment) {
+            return dnsPayments.getIfPresent(new DnsAddress(silentPayment.getSilentPaymentAddress()));
+        } else {
+            return dnsPayments.getIfPresent(new DnsAddress(payment.getAddress()));
+        }
+    }
+
+    public static DnsPayment getDnsPayment(String hrn) {
+        for(DnsPayment dnsPayment : dnsPayments.asMap().values()) {
+            if(dnsPayment.hrn().equals(hrn)) {
+                return dnsPayment;
+            }
+        }
+
+        return null;
+    }
+
+    public static void putDnsPayment(Address address, DnsPayment dnsPayment) {
+        dnsPayments.put(new DnsAddress(address), dnsPayment);
+    }
+
+    public static void putDnsPayment(SilentPaymentAddress silentPaymentAddress, DnsPayment dnsPayment) {
+        dnsPayments.put(new DnsAddress(silentPaymentAddress), dnsPayment);
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/DnsPaymentResolver.java

@@ -0,0 +1,193 @@
+package com.sparrowwallet.drongo.dns;
+
+import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.uri.BitcoinURI;
+import com.sparrowwallet.drongo.uri.BitcoinURIParseException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xbill.DNS.*;
+import org.xbill.DNS.Record;
+import org.xbill.DNS.dnssec.ValidatingResolver;
+import org.xbill.DNS.lookup.LookupResult;
+import org.xbill.DNS.lookup.LookupSession;
+import org.xbill.DNS.lookup.NoSuchDomainException;
+
+import java.io.ByteArrayInputStream;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Clock;
+import java.time.Instant;
+import java.util.*;
+import java.util.concurrent.ExecutionException;
+
+import static com.sparrowwallet.drongo.uri.BitcoinURI.BITCOIN_SCHEME;
+
+public class DnsPaymentResolver {
+    private static final Logger log = LoggerFactory.getLogger(DnsPaymentResolver.class);
+
+    private static final String BITCOIN_URI_PREFIX = BITCOIN_SCHEME + ":";
+    private static final String DEFAULT_RESOLVER_IP_ADDRESS = "8.8.8.8";
+
+    static String ROOT = ". IN DS 20326 8 2 E06D44B80B8F1D39A95C0B0D7C65D08458E880409BBC683457104237C7F8EC8D\n" +
+            ". IN DS 38696 8 2 683D2D0ACB8C9B712A1948B27F741219298D0A450D612C483AF444A4C0FB2B16";
+
+    private final String hrn;
+    private final String domain;
+    private final Clock clock;
+
+    public DnsPaymentResolver(String hrn) {
+        this(hrn, Clock.systemUTC());
+    }
+
+    public DnsPaymentResolver(String hrn, Clock clock) {
+        if(!StandardCharsets.US_ASCII.newEncoder().canEncode(hrn)) {
+            throw new IllegalArgumentException("Invalid HRN containing non-ASCII characters: " + hrn);
+        }
+        this.hrn = hrn;
+        String[] parts = hrn.split("@");
+        if(parts.length != 2) {
+            throw new IllegalArgumentException("Invalid HRN: " + hrn);
+        }
+        this.domain = parts[0] + ".user._bitcoin-payment." + parts[1];
+        this.clock = clock;
+    }
+
+    public Optional<DnsPayment> resolve() throws IOException, DnsPaymentValidationException, BitcoinURIParseException, ExecutionException, InterruptedException {
+        return resolve(DEFAULT_RESOLVER_IP_ADDRESS);
+    }
+
+    /**
+     * Performs online resolution of the BIP 353 HRN via the configured resolver
+     *
+     * @param resolverIpAddress the IP address of the resolver to use for the DNS lookup
+     * @return The DNS payment instruction, if present
+     * @throws IOException Thrown for a general I/O error
+     * @throws DnsPaymentValidationException Thrown for a DNSSEC or BIP 353 validation failure
+     * @throws BitcoinURIParseException Thrown for an invalid BIP 21 URI
+     */
+    public Optional<DnsPayment> resolve(String resolverIpAddress) throws IOException, DnsPaymentValidationException, BitcoinURIParseException, ExecutionException, InterruptedException {
+        log.debug("Resolving payment record for: " + domain);
+
+        PersistingResolver persistingResolver = new PersistingResolver(resolverIpAddress);
+        ValidatingResolver validatingResolver = new ValidatingResolver(persistingResolver, clock);
+        validatingResolver.loadTrustAnchors(new ByteArrayInputStream(ROOT.getBytes(StandardCharsets.US_ASCII)));
+        validatingResolver.setEDNS(0, 0, ExtendedFlags.DO);
+        AuthenticatingResolver authenticatingResolver = new AuthenticatingResolver(validatingResolver);
+
+        try {
+            LookupSession lookupSession = LookupSession.builder().resolver(authenticatingResolver).build();
+            LookupResult result = lookupSession.lookupAsync(getName(), Type.TXT, DClass.IN).toCompletableFuture().get();
+            if(result.getRecords().isEmpty()) {
+                return Optional.empty();
+            }
+
+            String strBitcoinUri = getBitcoinURI(result.getRecords());
+            if(strBitcoinUri.isEmpty()) {
+                return Optional.empty();
+            }
+            BitcoinURI bitcoinURI = new BitcoinURI(strBitcoinUri);
+            validateResponse(authenticatingResolver, new ArrayList<>(persistingResolver.getChain()));
+
+            byte[] proofChain = persistingResolver.chainToWire();
+            log.debug("Resolved " + hrn + " with proof " + Utils.bytesToHex(proofChain));
+
+            return Optional.of(new DnsPayment(hrn, bitcoinURI, proofChain));
+        } catch(ExecutionException e) {
+            if(e.getCause() instanceof NoSuchDomainException) {
+                return Optional.empty();
+            } else {
+                throw e;
+            }
+        }
+    }
+
+    /**
+     * Performs offline resolution of the BIP 353 HRN via the provided authentication chain
+     *
+     * @param proofChain authentication chain of unsorted DNS records in wire format
+     * @return The DNS payment instruction, if present
+     * @throws IOException Thrown for a general I/O error
+     * @throws DnsPaymentValidationException Thrown for a DNSSEC or BIP 353 validation failure
+     * @throws BitcoinURIParseException Thrown for an invalid BIP 21 URI
+     */
+    public Optional<DnsPayment> resolve(byte[] proofChain) throws IOException, DnsPaymentValidationException, BitcoinURIParseException, ExecutionException, InterruptedException {
+        OfflineResolver offlineResolver = new OfflineResolver(proofChain);
+        ValidatingResolver offlineValidatingResolver = new ValidatingResolver(offlineResolver, clock);
+        offlineValidatingResolver.loadTrustAnchors(new ByteArrayInputStream(ROOT.getBytes(StandardCharsets.US_ASCII)));
+        AuthenticatingResolver authenticatingResolver = new AuthenticatingResolver(offlineValidatingResolver);
+
+        Instant now = clock.instant();
+        Instant oneHourAgo = now.minusSeconds(3600);
+        for(Record record : offlineResolver.getCachedSigs()) {
+            if(record instanceof RRSIGRecord rrsig) {
+                if(rrsig.getTimeSigned().isAfter(now)) {
+                    throw new DnsPaymentValidationException("Invalid RRSIG record signed in the future");
+                } else if(rrsig.getExpire().isBefore(oneHourAgo)) {
+                    throw new DnsPaymentValidationException("Invalid RRSIG record expired earlier than 1 hour ago");
+                }
+            }
+        }
+
+        try {
+            LookupSession lookupSession = LookupSession.builder().resolver(authenticatingResolver).build();
+            LookupResult result = lookupSession.lookupAsync(getName(), Type.TXT, DClass.IN).toCompletableFuture().get();
+            if(result.getRecords().isEmpty()) {
+                return Optional.empty();
+            }
+
+            String strBitcoinUri = getBitcoinURI(result.getRecords());
+            if(strBitcoinUri.isEmpty()) {
+                return Optional.empty();
+            }
+            BitcoinURI bitcoinURI = new BitcoinURI(strBitcoinUri);
+            validateResponse(authenticatingResolver, offlineResolver.getRecords());
+
+            return Optional.of(new DnsPayment(hrn, bitcoinURI, proofChain));
+        } catch(ExecutionException e) {
+            if(e.getCause() instanceof NoSuchDomainException) {
+                return Optional.empty();
+            } else {
+                throw e;
+            }
+        }
+    }
+
+    private Name getName() throws TextParseException {
+        return Name.fromString(domain + ".");
+    }
+
+    private void validateResponse(AuthenticatingResolver resolver, List<Record> records) throws DnsPaymentValidationException {
+        boolean isValidated = resolver.isAuthenticated();
+        if(!isValidated) {
+            throw new DnsPaymentValidationException("DNSSEC validation failed, could not authenticate the payment instruction");
+        }
+
+        Map<Record, String> securityWarnings = RecordUtils.checkSecurityConstraints(records);
+        if(!securityWarnings.isEmpty()) {
+            Optional<String> optWarning = securityWarnings.entrySet().stream().map(e -> e.getKey().getName() + ": " + e.getValue()).reduce((a, b) -> a + "\n" + b);
+            throw new DnsPaymentValidationException("DNSSEC validation failed with the following errors:\n" + optWarning.get());
+        }
+    }
+
+    private String getBitcoinURI(List<Record> answers) throws DnsPaymentValidationException {
+        StringBuilder uriBuilder = new StringBuilder();
+        for(Record record : answers) {
+            if(record.getType() == Type.TXT) {
+                TXTRecord txt = (TXTRecord)record;
+                List<String> strings = txt.getStrings();
+                log.debug("Found TXT records for " + domain + ": " + strings);
+                if(strings.isEmpty() || !strings.getFirst().startsWith(BITCOIN_URI_PREFIX)) {
+                    continue;
+                }
+                if(strings.getFirst().startsWith(BITCOIN_URI_PREFIX) && !uriBuilder.isEmpty()) {
+                    throw new DnsPaymentValidationException("Multiple TXT records found starting with " + BITCOIN_URI_PREFIX);
+                }
+                for(String s : strings) {
+                    uriBuilder.append(s);
+                }
+            }
+        }
+
+        return uriBuilder.toString();
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/DnsPaymentValidationException.java

@@ -0,0 +1,7 @@
+package com.sparrowwallet.drongo.dns;
+
+public class DnsPaymentValidationException extends Exception {
+    public DnsPaymentValidationException(String message) {
+        super(message);
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/OfflineResolver.java

@@ -0,0 +1,185 @@
+package com.sparrowwallet.drongo.dns;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executor;
+
+import org.xbill.DNS.*;
+import org.xbill.DNS.Record;
+
+import static com.sparrowwallet.drongo.dns.RecordUtils.fromWire;
+
+public class OfflineResolver implements Resolver {
+    private final List<Record> cachedRrs = new ArrayList<>();
+    private final List<RRSIGRecord> cachedSigs = new ArrayList<>();
+
+    public OfflineResolver(byte[] chain) throws WireParseException {
+        DNSInput in = new DNSInput(chain);
+        while(in.remaining() > 0) {
+            Record record = fromWire(in, Section.ANSWER, false);
+            if(record instanceof RRSIGRecord rrsig) {
+                cachedSigs.add(rrsig);
+            } else {
+                cachedRrs.add(record);
+            }
+        }
+    }
+
+    @Override
+    public void setPort(int port) {
+        throw new UnsupportedOperationException("Unsupported");
+    }
+
+    @Override
+    public void setTCP(boolean flag) {
+        throw new UnsupportedOperationException("Unsupported");
+    }
+
+    // No-op
+    @Override
+    public void setIgnoreTruncation(boolean flag) {}
+
+    // No-op
+    @Override
+    public void setEDNS(int level, int payloadSize, int flags, List<EDNSOption> options) {}
+
+    @Override
+    public void setTSIGKey(TSIG key) {
+        throw new UnsupportedOperationException("Unsupported");
+    }
+
+    @Override
+    public void setTimeout(Duration timeout) {
+        throw new UnsupportedOperationException("Unsupported");
+    }
+
+    @Override
+    public CompletionStage<Message> sendAsync(Message query, Executor executor) {
+        Message response = makeNoErrorResponse(query);
+        addRecords(query.getQuestion(), response);
+
+        if(response.getSection(Section.ANSWER).isEmpty() && response.getSection(Section.AUTHORITY).isEmpty()) {
+            response = makeNoDomainResponse(query);
+        }
+
+        return CompletableFuture.completedFuture(response);
+    }
+
+    private void addRecords(Record question, Message response) {
+        Name name = question.getName();
+
+        RRset cnameSet = getRRSet(name, Type.CNAME, question.getDClass());
+        addRRSetToMessage(response, cnameSet);
+
+        if(!cnameSet.rrs().isEmpty() && cnameSet.rrs().getFirst() instanceof CNAMERecord cnameRecord) {
+            name = cnameRecord.getTarget();
+        }
+
+        RRset answerSet = getRRSet(name, question.getType(), question.getDClass());
+        addRRSetToMessage(response, answerSet);
+    }
+
+    private void addRRSetToMessage(Message response, RRset rrset) {
+        rrset.rrs().stream().forEach(it -> response.addRecord(it, Section.ANSWER));
+        rrset.sigs().stream().forEach(it -> response.addRecord(it, Section.ANSWER));
+
+        if(!rrset.sigs().isEmpty()) {
+            Name wildcard = RecordUtils.rrsetWildcard(rrset);
+            if(wildcard != null) {
+                RRset nsecRRset = getNSecRRSetForWildcard(wildcard);
+                nsecRRset.rrs().stream().forEach(it -> response.addRecord(it, Section.AUTHORITY));
+                nsecRRset.sigs().stream().forEach(it -> response.addRecord(it, Section.AUTHORITY));
+            }
+        }
+    }
+
+    private RRset getRRSet(Name name, int type, int dclass) {
+        RRset rrset = new RRset();
+        for(Record it : cachedRrs) {
+            if(it.getName().equals(name) && it.getType() == type && it.getDClass() == dclass) {
+                rrset.addRR(it);
+            }
+        }
+
+        for(RRSIGRecord it : cachedSigs) {
+            if(it.getName().equals(name) && it.getTypeCovered() == type && it.getDClass() == dclass) {
+                rrset.addRR(it);
+            }
+        }
+
+        return rrset;
+    }
+
+    private RRset getNSecRRSetForWildcard(Name wildcard) {
+        RRset rrset = new RRset();
+
+        for(Record it : cachedRrs) {
+            if((it.getType() == Type.NSEC || it.getType() == Type.NSEC3) && RecordUtils.longestCommonName(it.getName(), wildcard) != Name.root) {
+                rrset.addRR(it);
+            }
+        }
+
+        for(RRSIGRecord it : cachedSigs) {
+            if((it.getTypeCovered() == Type.NSEC || it.getTypeCovered() == Type.NSEC3) && RecordUtils.longestCommonName(it.getName(), wildcard) != Name.root) {
+                rrset.addRR(it);
+            }
+        }
+
+        return rrset;
+    }
+
+    private Message makeNoDomainResponse(Message query) {
+        Header messageHeader = new Header();
+        messageHeader.setID(query.getHeader().getID());
+        messageHeader.setRcode(Rcode.NXDOMAIN);
+        messageHeader.setFlag(Flags.QR);
+        messageHeader.setFlag(Flags.CD);
+        messageHeader.setFlag(Flags.RD);
+        messageHeader.setFlag(Flags.RA);
+
+        Message answerMessage = new Message();
+        answerMessage.setHeader(messageHeader);
+
+        for(Record record : query.getSection(Section.QUESTION)) {
+            answerMessage.addRecord(record, Section.QUESTION);
+        }
+
+        return answerMessage;
+    }
+
+    private Message makeNoErrorResponse(Message query) {
+        Header messageHeader = new Header();
+        messageHeader.setID(query.getHeader().getID());
+        messageHeader.setRcode(Rcode.NOERROR);
+        messageHeader.setFlag(Flags.QR);
+        messageHeader.setFlag(Flags.CD);
+        messageHeader.setFlag(Flags.RD);
+        messageHeader.setFlag(Flags.RA);
+
+        Message answerMessage = new Message();
+        answerMessage.setHeader(messageHeader);
+
+        for(Record record : query.getSection(Section.QUESTION)) {
+            answerMessage.addRecord(record, Section.QUESTION);
+        }
+
+        return answerMessage;
+    }
+
+    public List<Record> getCachedRrs() {
+        return cachedRrs;
+    }
+
+    public List<RRSIGRecord> getCachedSigs() {
+        return cachedSigs;
+    }
+
+    public List<Record> getRecords() {
+        List<Record> records = new ArrayList<>(cachedRrs);
+        records.addAll(cachedSigs);
+        return records;
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/PersistingResolver.java

@@ -0,0 +1,79 @@
+package com.sparrowwallet.drongo.dns;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.xbill.DNS.*;
+import org.xbill.DNS.Record;
+
+import java.io.ByteArrayOutputStream;
+import java.net.UnknownHostException;
+import java.util.*;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.Executor;
+
+public class PersistingResolver extends SimpleResolver {
+    private static final Logger log = LoggerFactory.getLogger(PersistingResolver.class);
+
+    private final Set<Record> chain = new LinkedHashSet<>();
+
+    public PersistingResolver(String hostname) throws UnknownHostException {
+        super(hostname);
+    }
+
+    @Override
+    public CompletionStage<Message> sendAsync(Message query, Executor executor) {
+        CompletionStage<Message> result = super.sendAsync(query, executor);
+        return result.thenApply(response -> {
+            if(log.isDebugEnabled()) {
+                log.debug(responseToString(query, response));
+            }
+
+            addAnswerSectionToChain(response.getSection(Section.ANSWER));
+            addAuthoritySectionToChain(response.getSection(Section.AUTHORITY));
+            return response;
+        });
+    }
+
+    private void addAnswerSectionToChain(List<org.xbill.DNS.Record> section) {
+        if(section != null) {
+            chain.addAll(section);
+        }
+    }
+
+    private void addAuthoritySectionToChain(List<Record> section) {
+        if(section != null) {
+            for(Record r : section) {
+                if((r.getType() == Type.RRSIG && (r.getRRsetType() == Type.NSEC || r.getRRsetType() == Type.NSEC3)) || r.getType() == Type.NSEC || r.getType() == Type.NSEC3) {
+                    chain.add(r);
+                }
+            }
+        }
+    }
+
+    public Set<Record> getChain() {
+        return chain;
+    }
+
+    public byte[] chainToWire() {
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+
+        List<Record> sorted = new ArrayList<>(chain);
+        Collections.sort(sorted);
+        for(Record record : sorted) {
+            baos.writeBytes(record.toWireCanonical());
+        }
+
+        return baos.toByteArray();
+    }
+
+    private static String responseToString(Message query, Message response) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("Query for ").append(query.getQuestion().getName()).append(" returned:\n");
+        sb.append("Answer section:\n");
+        response.getSection(Section.ANSWER).stream().forEach(rr -> sb.append(rr).append("\n"));
+        sb.append("Authority section:\n");
+        response.getSection(Section.AUTHORITY).stream().forEach(rr -> sb.append(rr).append("\n"));
+        sb.append("\n");
+        return sb.toString();
+    }
+}

src/main/java/com/sparrowwallet/drongo/dns/RecordUtils.java

@@ -0,0 +1,123 @@
+package com.sparrowwallet.drongo.dns;
+
+import org.xbill.DNS.*;
+import org.xbill.DNS.Record;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class RecordUtils {
+    public static org.xbill.DNS.Record fromWire(DNSInput in, int section, boolean isUpdate) throws WireParseException {
+        int type;
+        int dclass;
+        long ttl;
+        int length;
+        Name name;
+
+        name = new Name(in);
+        type = in.readU16();
+        dclass = in.readU16();
+
+        if(section == Section.QUESTION) {
+            return org.xbill.DNS.Record.newRecord(name, type, dclass);
+        }
+
+        ttl = in.readU32();
+        length = in.readU16();
+        if(length == 0 && isUpdate && (section == Section.PREREQ || section == Section.UPDATE)) {
+            return org.xbill.DNS.Record.newRecord(name, type, dclass, ttl);
+        }
+
+        return Record.newRecord(name, type, dclass, ttl, length, in.readByteArray(length));
+    }
+
+    public static Map<Record, String> checkSecurityConstraints(List<Record> section) {
+        Map<Record, String> warnings = new HashMap<>();
+        if(section != null) {
+            for(Record record : section) {
+                if(record.getType() == Type.RRSIG) {
+                    RRSIGRecord rrsig = (RRSIGRecord)record;
+                    if(rrsig.getAlgorithm() == DNSSEC.Algorithm.RSASHA1 || rrsig.getAlgorithm() == DNSSEC.Algorithm.RSA_NSEC3_SHA1) {
+                        warnings.put(record, "Record contains weak SHA-1 based signature");
+                    }
+                } else if(record.getType() == Type.DNSKEY) {
+                    DNSKEYRecord dnskey = (DNSKEYRecord)record;
+                    if(dnskey.getAlgorithm() == DNSSEC.Algorithm.RSASHA1 || dnskey.getAlgorithm() == DNSSEC.Algorithm.RSA_NSEC3_SHA1 ||
+                            dnskey.getAlgorithm() == DNSSEC.Algorithm.RSASHA256 || dnskey.getAlgorithm() == DNSSEC.Algorithm.RSASHA512) {
+                        try {
+                            java.security.PublicKey publicKey = dnskey.getPublicKey();
+                            if(publicKey instanceof java.security.interfaces.RSAPublicKey rsaKey) {
+                                int keyLength = rsaKey.getModulus().bitLength();
+                                if(keyLength < 1024) {
+                                    warnings.put(record, "Record contains weak RSA public key with key length of " + keyLength + " bits");
+                                }
+                            }
+                        } catch(DNSSEC.DNSSECException e) {
+                            warnings.put(record, "Record contains invalid public key");
+                        }
+                    }
+                }
+            }
+        }
+
+        return warnings;
+    }
+
+    /**
+     * Determine by looking at a signed RRset whether the RRset name was the result of a wildcard
+     * expansion. If so, return the name of the generating wildcard.
+     *
+     * @param rrset The rrset to chedck.
+     * @return the wildcard name, if the rrset was synthesized from a wildcard. null if not.
+     */
+    public static Name rrsetWildcard(RRset rrset) {
+        List<RRSIGRecord> sigs = rrset.sigs();
+        RRSIGRecord firstSig = sigs.getFirst();
+
+        // check rest of signatures have identical label count
+        for(int i = 1; i < sigs.size(); i++) {
+            if(sigs.get(i).getLabels() != firstSig.getLabels()) {
+                throw new IllegalArgumentException("Label count mismatch on RRSIGs");
+            }
+        }
+
+        // if the RRSIG label count is shorter than the number of actual labels,
+        // then this rrset was synthesized from a wildcard.
+        // Note that the RRSIG label count doesn't count the root label.
+        Name wn = rrset.getName();
+
+        // skip a leading wildcard label in the dname (RFC4035 2.2)
+        if(rrset.getName().isWild()) {
+            wn = new Name(wn, 1);
+        }
+
+        int labelDiff = (wn.labels() - 1) - firstSig.getLabels();
+        if(labelDiff > 0) {
+            return wn.wild(labelDiff);
+        }
+
+        return null;
+    }
+
+    /**
+     * Finds the longest domain name in common with the given name.
+     *
+     * @param domain1 The first domain to process.
+     * @param domain2 The second domain to process.
+     * @return The longest label in common of domain1 and domain2. The least common name is the root.
+     */
+    public static Name longestCommonName(Name domain1, Name domain2) {
+        int l = Math.min(domain1.labels(), domain2.labels());
+        domain1 = new Name(domain1, domain1.labels() - l);
+        domain2 = new Name(domain2, domain2.labels() - l);
+        for(int i = 0; i < l - 1; i++) {
+            Name ns1 = new Name(domain1, i);
+            if(ns1.equals(new Name(domain2, i))) {
+                return ns1;
+            }
+        }
+
+        return Name.root;
+    }
+}

src/main/java/com/sparrowwallet/drongo/pgp/PGPUtils.java

@@ -1,5 +1,6 @@
 package com.sparrowwallet.drongo.pgp;
 
+import com.sparrowwallet.drongo.IOUtils;
 import org.bouncycastle.bcpg.ArmoredInputStream;
 import org.bouncycastle.gpg.keybox.KeyBlob;
 import org.bouncycastle.gpg.keybox.PublicKeyRingBlob;
@@ -22,14 +23,11 @@ import java.io.InputStream;
 import java.time.Instant;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Locale;
+import java.util.*;
 
 public class PGPUtils {
     private static final Logger log = LoggerFactory.getLogger(PGPUtils.class);
-    public static final String APPLICATION_KEYRING = "/gpg/pubkeys.asc";
+    public static final String APPLICATION_KEYRING_DIR = "gpg/";
     public static final String PUBRING_GPG = "pubring.gpg";
     public static final String PUBRING_KBX = "pubring.kbx";
 
@@ -53,9 +51,7 @@ public class PGPUtils {
             if(userPgpPublicKeyRingCollection != null) {
                 options.addVerificationCerts(userPgpPublicKeyRingCollection);
             }
-            if(appPgpPublicKeyRingCollection != null) {
-                options.addVerificationCerts(appPgpPublicKeyRingCollection);
-            }
+            options.addVerificationCerts(appPgpPublicKeyRingCollection);
             if(detachedSignatureStream != null) {
                 options.addVerificationOfDetachedSignatures(detachedSignatureStream);
             }
@@ -80,8 +76,7 @@ public class PGPUtils {
                             signedByKey = publicKeyRing.getPublicKey(primaryKeyId);
                             keySource = PGPKeySource.USER;
                             log.debug("Signed using provided public key");
-                        } else if(appPgpPublicKeyRingCollection != null && appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId) != null
-                                && !isExpired(appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId))) {
+                        } else if(appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId) != null && !isExpired(appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId))) {
                             signedByKey = appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId);
                             keySource = PGPKeySource.APPLICATION;
                             log.debug("Signed using application public key");
@@ -89,7 +84,7 @@ public class PGPUtils {
                             signedByKey = userPgpPublicKeyRingCollection.getPublicKey(primaryKeyId);
                             keySource = PGPKeySource.GPG;
                             log.debug("Signed using user public key");
-                        } else if(appPgpPublicKeyRingCollection != null && appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId) != null) {
+                        } else if(appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId) != null) {
                             signedByKey = appPgpPublicKeyRingCollection.getPublicKey(primaryKeyId);
                             keySource = PGPKeySource.APPLICATION;
                             log.debug("Signed using expired application public key");
@@ -115,9 +110,9 @@ public class PGPUtils {
             }
 
             if(!result.getRejectedDetachedSignatures().isEmpty()) {
-                throw new PGPVerificationException(result.getRejectedDetachedSignatures().get(0).getValidationException().getMessage());
+                throw new PGPVerificationException(result.getRejectedDetachedSignatures().getFirst().getValidationException().getMessage());
             } else if(!result.getRejectedInlineSignatures().isEmpty()) {
-                throw new PGPVerificationException(result.getRejectedInlineSignatures().get(0).getValidationException().getMessage());
+                throw new PGPVerificationException(result.getRejectedInlineSignatures().getFirst().getValidationException().getMessage());
             }
 
             throw new PGPVerificationException("No signatures found");
@@ -127,16 +122,22 @@ public class PGPUtils {
         }
     }
 
-    private static PGPPublicKeyRingCollection getApplicationKeyRingCollection() throws IOException {
-        try(InputStream pubKeyStream = PGPUtils.class.getResourceAsStream(APPLICATION_KEYRING)) {
-            if(pubKeyStream != null) {
-                return PGPainless.readKeyRing().publicKeyRingCollection(pubKeyStream);
+    private static PGPPublicKeyRingCollection getApplicationKeyRingCollection() {
+        List<PGPPublicKeyRing> rings = new ArrayList<>();
+        try {
+            String[] keyFiles = IOUtils.getResourceListing(PGPUtils.class, APPLICATION_KEYRING_DIR);
+            for(String keyFile : keyFiles) {
+                try(InputStream pubkeyStream = PGPUtils.class.getResourceAsStream("/" + APPLICATION_KEYRING_DIR + keyFile)) {
+                    if(pubkeyStream != null) {
+                        rings.add(PGPainless.readKeyRing().publicKeyRing(pubkeyStream));
+                    }
+                }
             }
         } catch(Exception e) {
             log.warn("Error loading application key rings", e);
         }
 
-        return null;
+        return new PGPPublicKeyRingCollection(rings);
     }
 
     private static PGPPublicKeyRingCollection getUserKeyRingCollection() {

src/main/java/com/sparrowwallet/drongo/policy/Miniscript.java

@@ -4,8 +4,9 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 public class Miniscript {
-    private static final Pattern SINGLE_PATTERN = Pattern.compile("pkh?\\(");
+    private static final Pattern KEYHASH_PATTERN = Pattern.compile("pkh?\\(");
     private static final Pattern TAPROOT_PATTERN = Pattern.compile("tr\\(");
+    private static final Pattern SILENT_PAYMENTS_PATTERN = Pattern.compile("sp\\(");
     private static final Pattern MULTI_PATTERN = Pattern.compile("multi\\((\\d+)");
 
     private String script;
@@ -23,7 +24,7 @@ public class Miniscript {
     }
 
     public int getNumSignaturesRequired() {
-        Matcher singleMatcher = SINGLE_PATTERN.matcher(script);
+        Matcher singleMatcher = KEYHASH_PATTERN.matcher(script);
         if(singleMatcher.find()) {
             return 1;
         }
@@ -33,6 +34,11 @@ public class Miniscript {
             return 1;
         }
 
+        Matcher silentPaymentsMatcher = SILENT_PAYMENTS_PATTERN.matcher(script);
+        if(silentPaymentsMatcher.find()) {
+            return 1;
+        }
+
         Matcher multiMatcher = MULTI_PATTERN.matcher(script);
         if(multiMatcher.find()) {
             String threshold = multiMatcher.group(1);

src/main/java/com/sparrowwallet/drongo/policy/Policy.java

@@ -41,11 +41,11 @@ public class Policy extends Persistable {
     }
 
     public static Policy getPolicy(PolicyType policyType, ScriptType scriptType, List<Keystore> keystores, Integer threshold) {
-        if(SINGLE.equals(policyType)) {
+        if(SINGLE_HD.equals(policyType)) {
             return new Policy(new Miniscript(scriptType.getDescriptor() + keystores.get(0).getScriptName() + scriptType.getCloseDescriptor()));
         }
 
-        if(MULTI.equals(policyType)) {
+        if(MULTI_HD.equals(policyType)) {
             StringBuilder builder = new StringBuilder();
             builder.append(scriptType.getDescriptor());
             builder.append(MULTISIG.getDescriptor());
@@ -58,6 +58,10 @@ public class Policy extends Persistable {
             return new Policy(new Miniscript(builder.toString()));
         }
 
+        if(SINGLE_SP.equals(policyType)) {
+            return new Policy(new Miniscript("sp(" + keystores.get(0).getScriptName() + ")"));
+        }
+
         throw new PolicyException("No standard policy for " + policyType + " policy with script type " + scriptType);
     }
 

src/main/java/com/sparrowwallet/drongo/policy/PolicyType.java

@@ -5,13 +5,15 @@ import com.sparrowwallet.drongo.protocol.ScriptType;
 import static com.sparrowwallet.drongo.protocol.ScriptType.*;
 
 public enum PolicyType {
-    SINGLE("Single Signature", P2WPKH), MULTI("Multi Signature", P2WSH), CUSTOM("Custom", P2WSH);
+    SINGLE_HD("Single Signature HD", "Single Signature HD", P2WPKH), MULTI_HD("Multi Signature HD", "Multi Signature HD", P2WSH), SINGLE_SP("Single Signature SP", "Single Signature SP (Silent Payments)", P2TR);
 
-    private String name;
-    private ScriptType defaultScriptType;
+    private final String name;
+    private final String description;
+    private final ScriptType defaultScriptType;
 
-    PolicyType(String name, ScriptType defaultScriptType) {
+    PolicyType(String name, String description, ScriptType defaultScriptType) {
         this.name = name;
+        this.description = description;
         this.defaultScriptType = defaultScriptType;
     }
 
@@ -19,6 +21,10 @@ public enum PolicyType {
         return name;
     }
 
+    public String getDescription() {
+        return description;
+    }
+
     public ScriptType getDefaultScriptType() {
         return defaultScriptType;
     }

src/main/java/com/sparrowwallet/drongo/protocol/Bech32.java

@@ -22,10 +22,10 @@ import java.util.Locale;
 
 public class Bech32 {
     /** The Bech32 character set for encoding. */
-    private static final String CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
+    public static final String CHARSET = "qpzry9x8gf2tvdw0s3jn54khce6mua7l";
 
     /** The Bech32 character set for decoding. */
-    private static final byte[] CHARSET_REV = {
+    public static final byte[] CHARSET_REV = {
             -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
             -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
             -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
@@ -36,6 +36,9 @@ public class Bech32 {
             1,  0,  3, 16, 11, 28, 12, 14,  6,  4,  2, -1, -1, -1, -1, -1
     };
 
+    private static final int BECH32_CHECKSUM_LEN = 6;
+    public static final char BECH32_SEPARATOR = '1';
+
     public static class Bech32Data {
         public final String hrp;
         public final byte[] data;
@@ -102,12 +105,12 @@ public class Bech32 {
     /** Create a checksum. */
     private static byte[] createChecksum(final String hrp, Encoding encoding, final byte[] values)  {
         byte[] hrpExpanded = expandHrp(hrp);
-        byte[] enc = new byte[hrpExpanded.length + values.length + 6];
+        byte[] enc = new byte[hrpExpanded.length + values.length + BECH32_CHECKSUM_LEN];
         System.arraycopy(hrpExpanded, 0, enc, 0, hrpExpanded.length);
         System.arraycopy(values, 0, enc, hrpExpanded.length, values.length);
         int mod = polymod(enc) ^ encoding.checksumConstant;
-        byte[] ret = new byte[6];
-        for (int i = 0; i < 6; ++i) {
+        byte[] ret = new byte[BECH32_CHECKSUM_LEN];
+        for (int i = 0; i < BECH32_CHECKSUM_LEN; ++i) {
             ret[i] = (byte) ((mod >>> (5 * (5 - i))) & 31);
         }
         return ret;
@@ -121,6 +124,11 @@ public class Bech32 {
     /** Encode a Bech32 string. */
     public static String encode(String hrp, int version, final byte[] values) {
         Encoding encoding = (version == 0 ? Encoding.BECH32 : Encoding.BECH32M);
+        return encode(hrp, version, encoding, values);
+    }
+
+    /** Encode a Bech32 string. */
+    public static String encode(String hrp, int version, Encoding encoding, final byte[] values) {
         return encode(hrp, encoding, encode(version, values));
     }
 
@@ -141,7 +149,7 @@ public class Bech32 {
         System.arraycopy(checksum, 0, combined, values.length, checksum.length);
         StringBuilder sb = new StringBuilder(hrp.length() + 1 + combined.length);
         sb.append(hrp);
-        sb.append('1');
+        sb.append(BECH32_SEPARATOR);
         for (byte b : combined) {
             sb.append(CHARSET.charAt(b));
         }
@@ -154,6 +162,21 @@ public class Bech32 {
     }
 
     public static Bech32Data decode(final String str, int limit) {
+        final int separatorPos = str.lastIndexOf(BECH32_SEPARATOR);
+        validate(str, limit, separatorPos, BECH32_CHECKSUM_LEN);
+        byte[] values = rawDecode(str, separatorPos);
+        String hrp = str.substring(0, separatorPos).toLowerCase(Locale.ROOT);
+        Encoding encoding = verifyChecksum(hrp, values);
+        if(encoding == null) {
+            throw new ProtocolException("Invalid checksum");
+        }
+
+        return new Bech32Data(hrp, Arrays.copyOfRange(values, 0, values.length - BECH32_CHECKSUM_LEN), encoding);
+    }
+
+    /** Helper for validating the basic string correctness */
+    public static void validate(final String str, int limit, int separatorPos, int checksumLen) {
+        if (separatorPos < 1) throw new ProtocolException("Missing human-readable part");
         boolean lower = false, upper = false;
         if (str.length() < 8)
             throw new ProtocolException("Input too short: " + str.length());
@@ -173,23 +196,23 @@ public class Bech32 {
                 upper = true;
             }
         }
-        final int pos = str.lastIndexOf('1');
-        if (pos < 1) throw new ProtocolException("Missing human-readable part");
-        final int dataPartLength = str.length() - 1 - pos;
-        if (dataPartLength < 6) throw new ProtocolException("Data part too short: " + dataPartLength);
+        final int dataPartLength = str.length() - 1 - separatorPos;
+        if (dataPartLength < checksumLen) throw new ProtocolException("Data part too short: " + dataPartLength);
+
+        for (int i = 0; i < dataPartLength; ++i) {
+            char c = str.charAt(i + separatorPos + 1);
+            if (CHARSET_REV[c] == -1) throw new ProtocolException("Invalid character " + c + " at position " + i);
+        }
+    }
+
+    public static byte[] rawDecode(final String str, int separator_pos) {
+        final int dataPartLength = str.length() - 1 - separator_pos;
         byte[] values = new byte[dataPartLength];
         for (int i = 0; i < dataPartLength; ++i) {
-            char c = str.charAt(i + pos + 1);
-            if (CHARSET_REV[c] == -1) throw new ProtocolException("Invalid character " + c + " at position " + i);
+            char c = str.charAt(i + separator_pos + 1);
             values[i] = CHARSET_REV[c];
         }
-        String hrp = str.substring(0, pos).toLowerCase(Locale.ROOT);
-        Encoding encoding = verifyChecksum(hrp, values);
-        if(encoding == null) {
-            throw new ProtocolException("Invalid checksum");
-        }
-
-        return new Bech32Data(hrp, Arrays.copyOfRange(values, 0, values.length - 6), encoding);
+        return values;
     }
 
     private static byte[] encode(int witnessVersion, byte[] witnessProgram) {
@@ -204,7 +227,12 @@ public class Bech32 {
      * Helper for re-arranging bits into groups.
      */
     public static byte[] convertBits(final byte[] in, final int inStart, final int inLen, final int fromBits,
-                                      final int toBits, final boolean pad) {
+                                     final int toBits, final boolean pad) {
+        return convertBits(in, inStart, inLen, fromBits,toBits, pad, true);
+    }
+
+    public static byte[] convertBits(final byte[] in, final int inStart, final int inLen, final int fromBits,
+                                      final int toBits, final boolean pad, final boolean enforcePaddingZero) {
         int acc = 0;
         int bits = 0;
         ByteArrayOutputStream out = new ByteArrayOutputStream(64);
@@ -226,7 +254,11 @@ public class Bech32 {
         if (pad) {
             if (bits > 0)
                 out.write((acc << (toBits - bits)) & maxv);
-        } else if (bits >= fromBits || ((acc << (toBits - bits)) & maxv) != 0) {
+        } else if (bits >= fromBits) {
+            // Incomplete group at end must be less than fromBits
+            throw new ProtocolException("Could not convert bits, invalid padding");
+        } else if (enforcePaddingZero && (((acc << (toBits - bits)) & maxv) != 0)) {
+            // Incomplete group at end must be all zeros
             throw new ProtocolException("Could not convert bits, invalid padding");
         }
         return out.toByteArray();

src/main/java/com/sparrowwallet/drongo/protocol/Block.java

@@ -0,0 +1,45 @@
+package com.sparrowwallet.drongo.protocol;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class Block extends Message {
+    private BlockHeader blockHeader;
+    private Sha256Hash hash;
+    private List<Transaction> transactions;
+
+    public Block(byte[] payload) {
+        super(payload, 0);
+    }
+
+    public void parse() {
+        blockHeader = new BlockHeader(payload, cursor);
+        cursor += blockHeader.getMessageSize();
+
+        hash = Sha256Hash.wrapReversed(Sha256Hash.hashTwice(payload, offset, cursor - offset));
+        if(cursor != payload.length) {
+            int numTransactions = (int)readVarInt();
+            transactions = new ArrayList<>(numTransactions);
+            for(int i = 0; i < numTransactions; i++) {
+                Transaction tx = new Transaction(payload, cursor);
+                transactions.add(tx);
+                cursor += tx.getMessageSize();
+            }
+        } else {
+            transactions = Collections.emptyList();
+        }
+    }
+
+    public BlockHeader getBlockHeader() {
+        return blockHeader;
+    }
+
+    public Sha256Hash getHash() {
+        return hash;
+    }
+
+    public List<Transaction> getTransactions() {
+        return transactions;
+    }
+}

src/main/java/com/sparrowwallet/drongo/protocol/BlockHeader.java

@@ -19,6 +19,10 @@ public class BlockHeader extends Message {
         super(rawheader, 0);
     }
 
+    public BlockHeader(byte[] blockdata, int offset) {
+        super(blockdata, offset);
+    }
+
     public BlockHeader(long version, Sha256Hash prevBlockHash, Sha256Hash merkleRoot, Sha256Hash witnessRoot, long time, long difficultyTarget, long nonce) {
         this.version = version;
         this.prevBlockHash = prevBlockHash;

src/main/java/com/sparrowwallet/drongo/protocol/Script.java

@@ -3,6 +3,7 @@ package com.sparrowwallet.drongo.protocol;
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.address.*;
 import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.policy.PolicyType;
 import org.bouncycastle.util.encoders.Hex;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -198,7 +199,7 @@ public class Script {
 
         for(ScriptType scriptType : SINGLE_KEY_TYPES) {
             if(scriptType.isScriptType(this)) {
-                return new Address[] { scriptType.getAddress(scriptType.getPublicKeyFromScript(this)) };
+                return new Address[] { scriptType.getAddress(PolicyType.SINGLE_HD, scriptType.getPublicKeyFromScript(this)) };
             }
         }
 
@@ -212,6 +213,10 @@ public class Script {
             return addresses.toArray(new Address[addresses.size()]);
         }
 
+        if(P2A.isScriptType(this)) {
+            return new Address[] { P2A.getAddress(P2A.getDataFromScript(this)) };
+        }
+
         throw new NonStandardScriptException("Cannot find addresses in non standard script: " + toString());
     }
 

src/main/java/com/sparrowwallet/drongo/protocol/ScriptType.java

@@ -24,7 +24,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             return getAddress(key.getPubKey());
         }
 
@@ -48,7 +48,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             return getOutputScript(key.getPubKey());
         }
 
@@ -100,7 +100,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -111,18 +111,18 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
-            Script scriptSig = getScriptSig(prevOutput.getScript(), pubKey, signature);
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig);
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
@@ -133,7 +133,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(SINGLE);
+            return List.of(SINGLE_HD);
         }
     },
     P2PKH("P2PKH", "Legacy (P2PKH)", "m/44'/0'/0'") {
@@ -143,7 +143,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             return getAddress(key.getPubKeyHash());
         }
 
@@ -165,7 +165,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             return getOutputScript(key.getPubKeyHash());
         }
 
@@ -216,7 +216,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -229,18 +229,18 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
-            Script scriptSig = getScriptSig(prevOutput.getScript(), pubKey, signature);
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig);
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
@@ -251,7 +251,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(SINGLE);
+            return List.of(SINGLE_HD);
         }
     },
     MULTISIG("Bare Multisig", "Bare Multisig", "m/44'/0'/0'") {
@@ -266,7 +266,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key address for multisig script type");
         }
 
@@ -281,7 +281,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             throw new ProtocolException("Output script for multisig script type must be constructed with method getOutputScript(int threshold, List<ECKey> pubKeys)");
         }
 
@@ -398,17 +398,17 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException(getName() + " is a multisig script type");
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException(getName() + " is a multisig script type");
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -430,8 +430,8 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
-            Script scriptSig = getMultisigScriptSig(prevOutput.getScript(), threshold, pubKeySignatures);
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            Script scriptSig = getMultisigScriptSig(policyType, prevOutput.getScript(), threshold, pubKeySignatures);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig);
         }
 
@@ -442,7 +442,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(MULTI);
+            return List.of(MULTI_HD);
         }
     },
     P2SH("P2SH", "Legacy (P2SH)", "m/45'") {
@@ -452,7 +452,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key address for script hash type");
         }
 
@@ -472,7 +472,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key output script for script hash type");
         }
 
@@ -531,17 +531,17 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -551,7 +551,7 @@ public enum ScriptType {
                 throw new ProtocolException("P2SH scriptPubKey hash does not match constructed redeem script hash");
             }
 
-            Script multisigScript = MULTISIG.getMultisigScriptSig(redeemScript, threshold, pubKeySignatures);
+            Script multisigScript = MULTISIG.getMultisigScriptSig(policyType, redeemScript, threshold, pubKeySignatures);
             List<ScriptChunk> chunks = new ArrayList<>(multisigScript.getChunks());
             ScriptChunk redeemScriptChunk = ScriptChunk.fromData(redeemScript.getProgram());
             chunks.add(redeemScriptChunk);
@@ -560,8 +560,8 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
-            Script scriptSig = getMultisigScriptSig(prevOutput.getScript(), threshold, pubKeySignatures);
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            Script scriptSig = getMultisigScriptSig(policyType, prevOutput.getScript(), threshold, pubKeySignatures);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig);
         }
 
@@ -572,7 +572,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(MULTI);
+            return List.of(MULTI_HD);
         }
     },
     P2SH_P2WPKH("P2SH-P2WPKH", "Nested Segwit (P2SH-P2WPKH)", "m/49'/0'/0'") {
@@ -582,7 +582,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             Script p2wpkhScript = P2WPKH.getOutputScript(key.getPubKeyHash());
             return P2SH.getAddress(p2wpkhScript);
         }
@@ -602,7 +602,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             Script p2wpkhScript = P2WPKH.getOutputScript(key.getPubKeyHash());
             return P2SH.getOutputScript(p2wpkhScript);
         }
@@ -642,12 +642,12 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
 
-            Script redeemScript = P2WPKH.getOutputScript(pubKey);
+            Script redeemScript = P2WPKH.getOutputScript(policyType, pubKey);
             if(!scriptPubKey.equals(P2SH.getOutputScript(redeemScript))) {
                 throw new ProtocolException(getName() + " scriptPubKey hash does not match constructed redeem script hash");
             }
@@ -657,19 +657,19 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
-            Script scriptSig = getScriptSig(prevOutput.getScript(), pubKey, signature);
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
             TransactionWitness witness = new TransactionWitness(transaction, pubKey, signature);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig, witness);
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
@@ -680,7 +680,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(SINGLE);
+            return List.of(SINGLE_HD);
         }
     },
     P2SH_P2WSH("P2SH-P2WSH", "Nested Segwit (P2SH-P2WSH)", "m/48'/0'/0'/1'") {
@@ -690,7 +690,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key address for wrapped witness script hash type");
         }
 
@@ -706,7 +706,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key output script for wrapped witness script hash type");
         }
 
@@ -746,17 +746,17 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -772,8 +772,8 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
-            Script scriptSig = getMultisigScriptSig(prevOutput.getScript(), threshold, pubKeySignatures);
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            Script scriptSig = getMultisigScriptSig(policyType, prevOutput.getScript(), threshold, pubKeySignatures);
             Script witnessScript = MULTISIG.getOutputScript(threshold, pubKeySignatures.keySet());
             TransactionWitness witness = new TransactionWitness(transaction, pubKeySignatures.values().stream().filter(Objects::nonNull).limit(threshold).collect(Collectors.toList()), witnessScript);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig, witness);
@@ -786,7 +786,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(MULTI, CUSTOM);
+            return List.of(MULTI_HD);
         }
     },
     P2WPKH("P2WPKH", "Native Segwit (P2WPKH)", "m/84'/0'/0'") {
@@ -796,7 +796,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             return getAddress(key.getPubKeyHash());
         }
 
@@ -815,7 +815,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             return getOutputScript(key.getPubKeyHash());
         }
 
@@ -860,12 +860,12 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
 
-            if(!scriptPubKey.equals(getOutputScript(pubKey))) {
+            if(!scriptPubKey.equals(getOutputScript(policyType, pubKey))) {
                 throw new ProtocolException("P2WPKH scriptPubKey hash does not match constructed pubkey script hash");
             }
 
@@ -873,19 +873,19 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
-            Script scriptSig = getScriptSig(prevOutput.getScript(), pubKey, signature);
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
             TransactionWitness witness = new TransactionWitness(transaction, pubKey, signature);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig, witness);
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new ProtocolException(getName() + " is not a multisig script type");
         }
 
@@ -896,7 +896,7 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(SINGLE);
+            return List.of(SINGLE_HD);
         }
     },
     P2WSH("P2WSH", "Native Segwit (P2WSH)", "m/48'/0'/0'/2'") {
@@ -906,7 +906,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey key) {
+        public Address getAddress(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key address for witness script hash type");
         }
 
@@ -925,7 +925,7 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey key) {
+        public Script getOutputScript(PolicyType policyType, ECKey key) {
             throw new ProtocolException("No single key output script for witness script hash type");
         }
 
@@ -974,17 +974,17 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
             throw new ProtocolException("Only multisig scriptSigs supported for " + getName() + " scriptPubKeys");
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
@@ -998,8 +998,8 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
-            Script scriptSig = getMultisigScriptSig(prevOutput.getScript(), threshold, pubKeySignatures);
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            Script scriptSig = getMultisigScriptSig(policyType, prevOutput.getScript(), threshold, pubKeySignatures);
             Script witnessScript = MULTISIG.getOutputScript(threshold, pubKeySignatures.keySet());
             TransactionWitness witness = new TransactionWitness(transaction, pubKeySignatures.values().stream().filter(Objects::nonNull).limit(threshold).collect(Collectors.toList()), witnessScript);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig, witness);
@@ -1012,13 +1012,13 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(MULTI, CUSTOM);
+            return List.of(MULTI_HD);
         }
     },
     P2TR("P2TR", "Taproot (P2TR)", "m/86'/0'/0'") {
         @Override
-        public ECKey getOutputKey(ECKey derivedKey) {
-            return derivedKey.getTweakedOutputKey();
+        public ECKey getOutputKey(PolicyType policyType, ECKey derivedKey) {
+            return policyType == SINGLE_SP ? derivedKey : derivedKey.getTweakedOutputKey();
         }
 
         @Override
@@ -1027,8 +1027,8 @@ public enum ScriptType {
         }
 
         @Override
-        public Address getAddress(ECKey derivedKey) {
-            return getAddress(getOutputKey(derivedKey).getPubKeyXCoord());
+        public Address getAddress(PolicyType policyType, ECKey derivedKey) {
+            return getAddress(getOutputKey(policyType, derivedKey).getPubKeyXCoord());
         }
 
         @Override
@@ -1046,8 +1046,8 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getOutputScript(ECKey derivedKey) {
-            return getOutputScript(getOutputKey(derivedKey).getPubKeyXCoord());
+        public Script getOutputScript(PolicyType policyType, ECKey derivedKey) {
+            return getOutputScript(getOutputKey(policyType, derivedKey).getPubKeyXCoord());
         }
 
         @Override
@@ -1096,12 +1096,12 @@ public enum ScriptType {
         }
 
         @Override
-        public Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
             if(!isScriptType(scriptPubKey)) {
                 throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
             }
 
-            if(!scriptPubKey.equals(getOutputScript(pubKey))) {
+            if(!scriptPubKey.equals(getOutputScript(policyType, pubKey))) {
                 throw new ProtocolException("Provided P2TR scriptPubKey does not match constructed pubkey script");
             }
 
@@ -1109,19 +1109,19 @@ public enum ScriptType {
         }
 
         @Override
-        public TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
-            Script scriptSig = getScriptSig(prevOutput.getScript(), pubKey, signature);
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
             TransactionWitness witness = new TransactionWitness(transaction, signature);
             return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig, witness);
         }
 
         @Override
-        public Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new UnsupportedOperationException("Constructing Taproot inputs is not yet supported");
         }
 
         @Override
-        public TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
             throw new UnsupportedOperationException("Constructing Taproot inputs is not yet supported");
         }
 
@@ -1132,7 +1132,123 @@ public enum ScriptType {
 
         @Override
         public List<PolicyType> getAllowedPolicyTypes() {
-            return List.of(SINGLE);
+            return List.of(SINGLE_HD, SINGLE_SP);
+        }
+    },
+    P2A("P2A", "Anchor (P2A)", "m/86'/0'/0'") {
+        @Override
+        public Address getAddress(byte[] data) {
+            return new P2AAddress(data);
+        }
+
+        @Override
+        public Address getAddress(PolicyType policyType, ECKey derivedKey) {
+            throw new ProtocolException("Cannot create a anchor address with a key");
+        }
+
+        @Override
+        public Address getAddress(Script script) {
+            throw new ProtocolException("Cannot create a anchor address with a script");
+        }
+
+        @Override
+        public Script getOutputScript(byte[] data) {
+            List<ScriptChunk> chunks = new ArrayList<>();
+            chunks.add(new ScriptChunk(OP_1, null));
+            chunks.add(new ScriptChunk(data.length, data));
+
+            return new Script(chunks);
+        }
+
+        @Override
+        public Script getOutputScript(PolicyType policyType, ECKey derivedKey) {
+            throw new ProtocolException("Cannot create an anchor output script with a key");
+        }
+
+        @Override
+        public Script getOutputScript(Script script) {
+            throw new ProtocolException("Cannot create an anchor output script with a script");
+        }
+
+        @Override
+        public String getOutputDescriptor(ECKey derivedKey) {
+            throw new ProtocolException("Cannot create an anchor output descriptor with a key");
+        }
+
+        @Override
+        public String getOutputDescriptor(Script script) {
+            throw new ProtocolException("Cannot create an anchor output descriptor with a script");
+        }
+
+        @Override
+        public String getDescriptor() {
+            return "addr(";
+        }
+
+        @Override
+        public boolean isScriptType(Script script) {
+            List<ScriptChunk> chunks = script.chunks;
+            if (chunks.size() != 2)
+                return false;
+            if (!chunks.get(0).equalsOpCode(OP_1))
+                return false;
+            byte[] chunk1data = chunks.get(1).data;
+            if (chunk1data == null)
+                return false;
+            if (!Arrays.equals(chunk1data, ANCHOR_WITNESS_PROGRAM)) {
+                return false;
+            }
+            return true;
+        }
+
+        @Override
+        public byte[] getDataFromScript(Script script) {
+            return script.chunks.get(1).data;
+        }
+
+        @Override
+        public byte[] getHashFromScript(Script script) {
+            throw new ProtocolException("P2A does not contain a hash");
+        }
+
+        @Override
+        public ECKey getPublicKeyFromScript(Script script) {
+            throw new ProtocolException("P2A does not contain a key");
+        }
+
+        @Override
+        public Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature) {
+            if(!isScriptType(scriptPubKey)) {
+                throw new ProtocolException("Provided scriptPubKey is not a " + getName() + " script");
+            }
+
+            return new Script(new byte[0]);
+        }
+
+        @Override
+        public TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature) {
+            Script scriptSig = getScriptSig(policyType, prevOutput.getScript(), pubKey, signature);
+            return transaction.addInput(prevOutput.getHash(), prevOutput.getIndex(), scriptSig);
+        }
+
+        @Override
+        public Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            throw new UnsupportedOperationException("Constructing Taproot inputs is not yet supported");
+        }
+
+        @Override
+        public TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures) {
+            throw new UnsupportedOperationException("Constructing Taproot inputs is not yet supported");
+        }
+
+        @Override
+        public TransactionSignature.Type getSignatureType() {
+            return TransactionSignature.Type.SCHNORR;
+        };
+
+        @Override
+        public List<PolicyType> getAllowedPolicyTypes() {
+            return Collections.emptyList();
         }
     };
 
@@ -1154,6 +1270,10 @@ public enum ScriptType {
         return description;
     }
 
+    public String getDescription(boolean includePolicyType) {
+        return includePolicyType && !getAllowedPolicyTypes().isEmpty() ? getAllowedPolicyTypes().getFirst().getName().toLowerCase(Locale.ROOT) + " " + description : description;
+    }
+
     public String getDefaultDerivationPath() {
         return Network.get() != Network.MAINNET ? defaultDerivationPath.replace("/0'/0'", "/1'/0'") : defaultDerivationPath;
     }
@@ -1214,19 +1334,19 @@ public enum ScriptType {
         return getAllowedPolicyTypes().contains(policyType);
     }
 
-    public ECKey getOutputKey(ECKey derivedKey) {
+    public ECKey getOutputKey(PolicyType policyType, ECKey derivedKey) {
         return derivedKey;
     }
 
     public abstract Address getAddress(byte[] bytes);
 
-    public abstract Address getAddress(ECKey key);
+    public abstract Address getAddress(PolicyType policyType, ECKey key);
 
     public abstract Address getAddress(Script script);
 
     public abstract Script getOutputScript(byte[] bytes);
 
-    public abstract Script getOutputScript(ECKey key);
+    public abstract Script getOutputScript(PolicyType policyType, ECKey key);
 
     public abstract Script getOutputScript(Script script);
 
@@ -1246,6 +1366,10 @@ public enum ScriptType {
 
     public abstract boolean isScriptType(Script script);
 
+    public byte[] getDataFromScript(Script script) {
+        throw new ProtocolException("Script type " + this + " does not contain data");
+    }
+
     public abstract byte[] getHashFromScript(Script script);
 
     public Address[] getAddresses(Script script) {
@@ -1264,13 +1388,13 @@ public enum ScriptType {
         throw new ProtocolException("Script type " + this + " is not a multisig script");
     }
 
-    public abstract Script getScriptSig(Script scriptPubKey, ECKey pubKey, TransactionSignature signature);
+    public abstract Script getScriptSig(PolicyType policyType, Script scriptPubKey, ECKey pubKey, TransactionSignature signature);
 
-    public abstract TransactionInput addSpendingInput(Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature);
+    public abstract TransactionInput addSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, ECKey pubKey, TransactionSignature signature);
 
-    public abstract Script getMultisigScriptSig(Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures);
+    public abstract Script getMultisigScriptSig(PolicyType policyType, Script scriptPubKey, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures);
 
-    public abstract TransactionInput addMultisigSpendingInput(Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures);
+    public abstract TransactionInput addMultisigSpendingInput(PolicyType policyType, Transaction transaction, TransactionOutput prevOutput, int threshold, Map<ECKey, TransactionSignature> pubKeySignatures);
 
     public abstract TransactionSignature.Type getSignatureType();
 
@@ -1278,11 +1402,13 @@ public enum ScriptType {
 
     public static final ScriptType[] SINGLE_HASH_TYPES = {P2PKH, P2SH, P2SH_P2WPKH, P2SH_P2WSH, P2WPKH, P2WSH};
 
-    public static final ScriptType[] ADDRESSABLE_TYPES = {P2PKH, P2SH, P2SH_P2WPKH, P2SH_P2WSH, P2WPKH, P2WSH, P2TR};
+    public static final ScriptType[] ADDRESSABLE_TYPES = {P2PKH, P2SH, P2SH_P2WPKH, P2SH_P2WSH, P2WPKH, P2WSH, P2TR, P2A};
 
     public static final ScriptType[] NON_WITNESS_TYPES = {P2PK, P2PKH, P2SH};
 
-    public static final ScriptType[] WITNESS_TYPES = {P2SH_P2WPKH, P2SH_P2WSH, P2WPKH, P2WSH, P2TR};
+    public static final ScriptType[] WITNESS_TYPES = {P2SH_P2WPKH, P2SH_P2WSH, P2WPKH, P2WSH, P2TR, P2A};
+
+    public static final byte[] ANCHOR_WITNESS_PROGRAM = new byte[] {78, 115};
 
     public static List<ScriptType> getScriptTypesForPolicyType(PolicyType policyType) {
         return Arrays.stream(values()).filter(scriptType -> scriptType.isAllowed(policyType)).collect(Collectors.toList());
@@ -1360,6 +1486,8 @@ public enum ScriptType {
         } else if(P2TR.equals(this)) {
             //Assume a default keypath spend
             return (32 + 4 + 1 + ((double)66 / WITNESS_SCALE_FACTOR) + 4);
+        } else if(P2A.equals(this)) {
+            return 32 + 4 + 1 + 4;
         } else if(Arrays.asList(WITNESS_TYPES).contains(this)) {
             //Return length of spending input with 75% discount to script size
             return (32 + 4 + 1 + ((double)107 / WITNESS_SCALE_FACTOR) + 4);

src/main/java/com/sparrowwallet/drongo/protocol/Transaction.java

@@ -3,6 +3,7 @@ package com.sparrowwallet.drongo.protocol;
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.policy.PolicyType;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -14,7 +15,7 @@ import static com.sparrowwallet.drongo.Utils.uint32ToByteStreamLE;
 import static com.sparrowwallet.drongo.Utils.uint64ToByteStreamLE;
 
 public class Transaction extends ChildMessage {
-    public static final int MAX_BLOCK_SIZE = 1000 * 1000;
+    public static final int MAX_BLOCK_SIZE_VBYTES = 1000 * 1000;
     public static final long MAX_BITCOIN = 21 * 1000 * 1000L;
     public static final long SATOSHIS_PER_BITCOIN = 100 * 1000 * 1000L;
     public static final long MAX_BLOCK_LOCKTIME = 500000000L;
@@ -53,6 +54,10 @@ public class Transaction extends ChildMessage {
         super(rawtx, 0);
     }
 
+    public Transaction(byte[] blockdata, int offset) {
+        super(blockdata, offset);
+    }
+
     public long getVersion() {
         return version;
     }
@@ -99,8 +104,8 @@ public class Transaction extends ChildMessage {
     }
 
     public Sha256Hash getTxId() {
-        if (cachedTxId == null) {
-            if (!hasWitnesses() && cachedWTxId != null) {
+        if(cachedTxId == null) {
+            if(!isSegwit() && cachedWTxId != null) {
                 cachedTxId = cachedWTxId;
             } else {
                 cachedTxId = calculateTxId(false);
@@ -110,11 +115,11 @@ public class Transaction extends ChildMessage {
     }
 
     public Sha256Hash getWTxId() {
-        if (cachedWTxId == null) {
-            if (!hasWitnesses() && cachedTxId != null) {
+        if(cachedWTxId == null) {
+            if(!isSegwit() && cachedTxId != null) {
                 cachedWTxId = cachedTxId;
             } else {
-                cachedWTxId = calculateTxId(true);
+                cachedWTxId = calculateTxId(isSegwit());
             }
         }
         return cachedWTxId;
@@ -369,8 +374,8 @@ public class Transaction extends ChildMessage {
         return Collections.unmodifiableList(outputs);
     }
 
-    public void shuffleOutputs() {
-        Collections.shuffle(outputs);
+    public void swapOutputs(int i, int j) {
+        Collections.swap(outputs, i, j);
     }
 
     public TransactionOutput addOutput(long value, Script script) {
@@ -382,7 +387,7 @@ public class Transaction extends ChildMessage {
     }
 
     public TransactionOutput addOutput(long value, ECKey pubkey) {
-        return addOutput(new TransactionOutput(this, value, ScriptType.P2PK.getOutputScript(pubkey)));
+        return addOutput(new TransactionOutput(this, value, ScriptType.P2PK.getOutputScript(PolicyType.SINGLE_HD, pubkey)));
     }
 
     public TransactionOutput addOutput(TransactionOutput output) {
@@ -395,7 +400,7 @@ public class Transaction extends ChildMessage {
     public void verify() throws VerificationException {
         if (inputs.size() == 0 || outputs.size() == 0)
             throw new VerificationException.EmptyInputsOrOutputs();
-        if (this.getMessageSize() > MAX_BLOCK_SIZE)
+        if (this.getMessageSize() > (MAX_BLOCK_SIZE_VBYTES * WITNESS_SCALE_FACTOR))
             throw new VerificationException.LargerThanMaxBlockSize();
 
         HashSet<TransactionOutPoint> outpoints = new HashSet<>();
@@ -437,11 +442,18 @@ public class Transaction extends ChildMessage {
 
     public static boolean isTransaction(byte[] bytes) {
         //Incomplete quick test
-        if(bytes.length == 0) {
+        if(bytes.length <= 5 || bytes.length > (MAX_BLOCK_SIZE_VBYTES * WITNESS_SCALE_FACTOR)) {
             return false;
         }
         long version = Utils.readUint32(bytes, 0);
-        return version > 0 && version < 5;
+        if(version <= 0) {
+            return false;
+        }
+        boolean segwit = (bytes[4] == 0);
+        if(segwit && bytes[5] == 0) {
+            return false;
+        }
+        return true;
     }
 
     public Sha256Hash hashForLegacySignature(int inputIndex, Script redeemScript, SigHash sigHash) {

src/main/java/com/sparrowwallet/drongo/protocol/TransactionInput.java

@@ -7,6 +7,7 @@ import java.io.OutputStream;
 
 public class TransactionInput extends ChildMessage {
     public static final long SEQUENCE_LOCKTIME_DISABLED = 4294967295L;
+    public static final long SEQUENCE_RBF_DISABLED = 4294967294L;
     public static final long SEQUENCE_RBF_ENABLED = 4294967293L;
     public static final long MAX_RELATIVE_TIMELOCK = 2147483647L;
     public static final long RELATIVE_TIMELOCK_VALUE_MASK = 0xFFFF;

src/main/java/com/sparrowwallet/drongo/protocol/TransactionOutput.java

@@ -60,6 +60,20 @@ public class TransactionOutput extends ChildMessage {
         return scriptBytes;
     }
 
+    public void setScriptBytes(byte[] scriptBytes) {
+        super.payload = null;
+        this.script = null;
+        int oldLength = length;
+        this.scriptBytes = scriptBytes;
+        // 8 = value
+        int newLength = 8 + (scriptBytes == null ? 1 : VarInt.sizeOf(scriptBytes.length) + scriptBytes.length);
+        adjustLength(newLength - oldLength);
+    }
+
+    public void clearScriptBytes() {
+        setScriptBytes(new byte[0]);
+    }
+
     public Script getScript() {
         if(script == null) {
             script = new Script(scriptBytes);

src/main/java/com/sparrowwallet/drongo/protocol/TransactionWitness.java

@@ -89,12 +89,8 @@ public class TransactionWitness extends ChildMessage {
         int length = new VarInt(pushes.size()).getSizeInBytes();
         for (int i = 0; i < pushes.size(); i++) {
             byte[] push = pushes.get(i);
-            if(push.length == 1 && push[0] == 0) {
-                length++;
-            } else {
-                length += new VarInt(push.length).getSizeInBytes();
-                length += push.length;
-            }
+            length += new VarInt(push.length).getSizeInBytes();
+            length += push.length;
         }
 
         return length;
@@ -104,12 +100,8 @@ public class TransactionWitness extends ChildMessage {
         stream.write(new VarInt(pushes.size()).encode());
         for(int i = 0; i < pushes.size(); i++) {
             byte[] push = pushes.get(i);
-            if(push.length == 1 && push[0] == 0) {
-                stream.write(push);
-            } else {
-                stream.write(new VarInt(push.length).encode());
-                stream.write(push);
-            }
+            stream.write(new VarInt(push.length).encode());
+            stream.write(push);
         }
     }
 

src/main/java/com/sparrowwallet/drongo/psbt/PSBTEntry.java

@@ -9,10 +9,8 @@ import com.sparrowwallet.drongo.protocol.VarInt;
 import java.io.ByteArrayOutputStream;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Map;
+import java.nio.charset.StandardCharsets;
+import java.util.*;
 
 public class PSBTEntry {
     private final byte[] key;
@@ -27,7 +25,7 @@ public class PSBTEntry {
         this.data = data;
     }
 
-    PSBTEntry(ByteBuffer psbtByteBuffer) throws PSBTParseException {
+    public PSBTEntry(ByteBuffer psbtByteBuffer) throws PSBTParseException {
         int keyLen = readCompactInt(psbtByteBuffer);
 
         if (keyLen == 0x00) {
@@ -79,6 +77,9 @@ public class PSBTEntry {
     }
 
     public static KeyDerivation parseKeyDerivation(byte[] data) throws PSBTParseException {
+        if(data.length == 0) {
+            return new KeyDerivation(KeyDerivation.DEFAULT_WATCH_ONLY_FINGERPRINT, Collections.emptyList());
+        }
         if(data.length < 4) {
             throw new PSBTParseException("Invalid master fingerprint specified: not enough bytes");
         }
@@ -144,6 +145,39 @@ public class PSBTEntry {
         return baos.toByteArray();
     }
 
+    public static Map<String, byte[]> parseDnssecProof(byte[] data) throws PSBTParseException {
+        if(data.length == 0) {
+            throw new PSBTParseException("No data provided for DNSSEC proof");
+        }
+
+        ByteBuffer bb = ByteBuffer.wrap(data);
+        int strLen = bb.get();
+        if(data.length < strLen + 1) {
+            throw new PSBTParseException("Invalid string length of " + strLen + " provided for DNSSEC proof");
+        }
+
+        byte[] strBytes = new byte[strLen];
+        bb.get(strBytes);
+        String hrn = new String(strBytes, StandardCharsets.US_ASCII);
+        byte[] proof = new byte[bb.remaining()];
+        bb.get(proof);
+        return Map.of(hrn, proof);
+    }
+
+    public static byte[] serializeDnssecProof(Map<String, byte[]> dnssecProof) {
+        if(dnssecProof.isEmpty()) {
+            throw new IllegalArgumentException("No DNSSEC proof provided");
+        }
+
+        String hrn = dnssecProof.keySet().iterator().next();
+        byte[] proof = dnssecProof.get(hrn);
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        baos.write(hrn.length());
+        baos.writeBytes(hrn.getBytes(StandardCharsets.US_ASCII));
+        baos.writeBytes(proof);
+        return baos.toByteArray();
+    }
+
     static PSBTEntry populateEntry(int type, byte[] keyData, byte[] data) {
         ByteArrayOutputStream baos = new ByteArrayOutputStream(1 + (keyData == null ? 0 : keyData.length));
         baos.writeBytes(writeCompactInt(type));
@@ -259,4 +293,16 @@ public class PSBTEntry {
             throw new PSBTParseException("PSBT key type must be one byte plus x only pub key");
         }
     }
+
+    public void checkOneBytePlusRipe160Key() throws PSBTParseException {
+        if(this.getKey().length != 21) {
+            throw new PSBTParseException("PSBT key type must be one byte plus Ripe160MD hash");
+        }
+    }
+
+    public void checkOneBytePlusSha256Key() throws PSBTParseException {
+        if(this.getKey().length != 33) {
+            throw new PSBTParseException("PSBT key type must be one byte plus SHA256 hash");
+        }
+    }
 }

src/main/java/com/sparrowwallet/drongo/psbt/PSBTInput.java

@@ -4,6 +4,7 @@ import com.sparrowwallet.drongo.KeyDerivation;
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.crypto.ECKey;
 import com.sparrowwallet.drongo.protocol.*;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentsDLEQProof;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -26,10 +27,23 @@ public class PSBTInput {
     public static final byte PSBT_IN_FINAL_SCRIPTSIG = 0x07;
     public static final byte PSBT_IN_FINAL_SCRIPTWITNESS = 0x08;
     public static final byte PSBT_IN_POR_COMMITMENT = 0x09;
-    public static final byte PSBT_IN_PROPRIETARY = (byte)0xfc;
+    public static final byte PSBT_IN_RIPEMD160 = 0x0a;
+    public static final byte PSBT_IN_SHA256 = 0x0b;
+    public static final byte PSBT_IN_HASH160 = 0x0c;
+    public static final byte PSBT_IN_HASH256 = 0x0d;
+    public static final byte PSBT_IN_PREVIOUS_TXID = 0x0e;
+    public static final byte PSBT_IN_OUTPUT_INDEX = 0x0f;
+    public static final byte PSBT_IN_SEQUENCE = 0x10;
+    public static final byte PSBT_IN_REQUIRED_TIME_LOCKTIME = 0x11;
+    public static final byte PSBT_IN_REQUIRED_HEIGHT_LOCKTIME = 0x12;
     public static final byte PSBT_IN_TAP_KEY_SIG = 0x13;
     public static final byte PSBT_IN_TAP_BIP32_DERIVATION = 0x16;
     public static final byte PSBT_IN_TAP_INTERNAL_KEY = 0x17;
+    public static final byte PSBT_IN_SP_ECDH_SHARE = 0x1d;
+    public static final byte PSBT_IN_SP_DLEQ = 0x1e;
+    public static final byte PSBT_IN_SP_SPEND_BIP32_DERIVATION = 0x1f;
+    public static final byte PSBT_IN_SP_TWEAK = 0x20;
+    public static final byte PSBT_IN_PROPRIETARY = (byte)0xfc;
 
     private final PSBT psbt;
     private Transaction nonWitnessUtxo;
@@ -42,24 +56,38 @@ public class PSBTInput {
     private Script finalScriptSig;
     private TransactionWitness finalScriptWitness;
     private String porCommitment;
+    private byte[] ripeMd160Preimage;
+    private byte[] sha256Preimage;
+    private byte[] hash160Preimage;
+    private byte[] hash256Preimage;
     private final Map<String, String> proprietary = new LinkedHashMap<>();
     private TransactionSignature tapKeyPathSignature;
     private Map<ECKey, Map<KeyDerivation, List<Sha256Hash>>> tapDerivedPublicKeys = new LinkedHashMap<>();
     private ECKey tapInternalKey;
 
-    private final Transaction transaction;
+    //PSBTv2-only fields
+    private Sha256Hash prevTxid;
+    private Long prevIndex;
+    private Long sequence;
+    private Long requiredTimeLocktime;
+    private Long requiredHeightLocktime;
+    private final Map<ECKey, ECKey> silentPaymentsEcdhShares = new LinkedHashMap<>();
+    private final Map<ECKey, SilentPaymentsDLEQProof> silentPaymentsDLEQProofs = new LinkedHashMap<>();
+    private final Map<ECKey, KeyDerivation> silentPaymentsSpendDerivations = new LinkedHashMap<>();
+    private byte[] silentPaymentsTweak;
+
     private int index;
 
     private static final Logger log = LoggerFactory.getLogger(PSBTInput.class);
 
-    PSBTInput(PSBT psbt, Transaction transaction, int index) {
+    PSBTInput(PSBT psbt, int index) {
         this.psbt = psbt;
-        this.transaction = transaction;
         this.index = index;
     }
 
-    PSBTInput(PSBT psbt, ScriptType scriptType, Transaction transaction, int index, Transaction utxo, int utxoIndex, Script redeemScript, Script witnessScript, Map<ECKey, KeyDerivation> derivedPublicKeys, Map<String, String> proprietary, ECKey tapInternalKey, boolean alwaysAddNonWitnessTx) {
-        this(psbt, transaction, index);
+    PSBTInput(PSBT psbt, ScriptType scriptType, int index, Transaction utxo, int utxoIndex, Long sequence, Script redeemScript, Script witnessScript,
+              Map<ECKey, KeyDerivation> derivedPublicKeys, Map<String, String> proprietary, ECKey tapInternalKey, boolean alwaysAddNonWitnessTx, byte[] silentPaymentsTweak, Map<ECKey, KeyDerivation> silentPaymentsSpendDerivations) {
+        this(psbt, index);
 
         if(Arrays.asList(ScriptType.WITNESS_TYPES).contains(scriptType)) {
             this.witnessUtxo = utxo.getOutputs().get(utxoIndex);
@@ -68,7 +96,7 @@ public class PSBTInput {
         }
 
         if(alwaysAddNonWitnessTx) {
-            //Add non-witness UTXO to segwit types to handle Trezor, Bitbox and Ledger requirements
+            //Add non-witness UTXO to segwit v0 types to handle Trezor, Bitbox and Ledger requirements
             this.nonWitnessUtxo = utxo;
         }
 
@@ -88,23 +116,42 @@ public class PSBTInput {
             tapDerivedPublicKeys.put(this.tapInternalKey, Map.of(tapKeyDerivation, Collections.emptyList()));
         }
 
-        this.sigHash = getDefaultSigHash();
+        this.sigHash = (scriptType == P2TR ? SigHash.DEFAULT : SigHash.ALL);
+
+        //Populate PSBTv2 fields if parent PSBT is v2
+        if(psbt.getPsbtVersion() >= 2) {
+            this.prevTxid = utxo.getTxId();
+            this.prevIndex = (long)utxoIndex;
+            this.sequence = sequence;
+        }
+
+        this.silentPaymentsTweak = silentPaymentsTweak;
+        this.silentPaymentsSpendDerivations.putAll(silentPaymentsSpendDerivations);
     }
 
-    PSBTInput(PSBT psbt, List<PSBTEntry> inputEntries, Transaction transaction, int index) throws PSBTParseException {
-        this.psbt = psbt;
-        for(PSBTEntry entry : inputEntries) {
-            switch(entry.getKeyType()) {
+    PSBTInput(PSBT psbt, List<PSBTEntry> inputEntries, int index) throws PSBTParseException {
+        this(psbt, index);
+        List<PSBTEntry> sortedEntries = new ArrayList<>(inputEntries);
+        sortedEntries.sort((o1, o2) -> {
+            int found1 = o1.getKeyType() == PSBT_IN_PREVIOUS_TXID || o1.getKeyType() == PSBT_IN_OUTPUT_INDEX ? 1 : 0;
+            int found2 = o2.getKeyType() == PSBT_IN_PREVIOUS_TXID || o2.getKeyType() == PSBT_IN_OUTPUT_INDEX ? 1 : 0;
+            return found2 - found1;
+        });
+
+        for(PSBTEntry entry : sortedEntries) {
+            switch((byte)entry.getKeyType()) {
                 case PSBT_IN_NON_WITNESS_UTXO:
                     entry.checkOneByteKey();
                     Transaction nonWitnessTx = new Transaction(entry.getData());
                     nonWitnessTx.verify();
                     Sha256Hash inputHash = nonWitnessTx.calculateTxId(false);
-                    Sha256Hash outpointHash = transaction.getInputs().get(index).getOutpoint().getHash();
+                    Sha256Hash outpointHash = getPrevTxid();
+                    if(outpointHash == null) {
+                        throw new PSBTParseException("Outpoint hash not present for input " + index);
+                    }
                     if(!outpointHash.equals(inputHash)) {
                         throw new PSBTParseException("Hash of provided non witness utxo transaction " + inputHash + " does not match transaction input outpoint hash " + outpointHash + " at index " + index);
                     }
-
                     this.nonWitnessUtxo = nonWitnessTx;
                     log.debug("Found input non witness utxo with txid: " + nonWitnessTx.getTxId() + " version " + nonWitnessTx.getVersion() + " size " + nonWitnessTx.getMessageSize() + " locktime " + nonWitnessTx.getLocktime());
                     for(TransactionInput input: nonWitnessTx.getInputs()) {
@@ -141,6 +188,9 @@ public class PSBTInput {
                     break;
                 case PSBT_IN_SIGHASH_TYPE:
                     entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT input sighash type must be 4 bytes");
+                    }
                     long sighashType = Utils.readUint32(entry.getData(), 0);
                     SigHash sigHash = SigHash.fromByte((byte)sighashType);
                     this.sigHash = sigHash;
@@ -151,7 +201,11 @@ public class PSBTInput {
                     Script redeemScript = new Script(entry.getData());
                     Script scriptPubKey = null;
                     if(this.nonWitnessUtxo != null) {
-                        scriptPubKey = this.nonWitnessUtxo.getOutputs().get((int)transaction.getInputs().get(index).getOutpoint().getIndex()).getScript();
+                        Long prevIndex = getPrevIndex();
+                        if(prevIndex == null) {
+                            throw new PSBTParseException("Outpoint index not present for input " + index);
+                        }
+                        scriptPubKey = this.nonWitnessUtxo.getOutputs().get(prevIndex.intValue()).getScript();
                     } else if(this.witnessUtxo != null) {
                         scriptPubKey = this.witnessUtxo.getScript();
                         if(!P2WPKH.isScriptType(redeemScript) && !P2WSH.isScriptType(redeemScript)) { //Witness UTXO should only be provided for P2SH-P2WPKH or P2SH-P2WSH
@@ -214,6 +268,118 @@ public class PSBTInput {
                     this.porCommitment = porMessage;
                     log.debug("Found input POR commitment message " + porMessage);
                     break;
+                case PSBT_IN_RIPEMD160:
+                    entry.checkOneBytePlusRipe160Key();
+                    if(!Arrays.equals(entry.getKeyData(), Ripemd160.getHash(entry.getData()))) {
+                        throw new PSBTParseException("Hash of PSBT_IN_RIPEMD160 preimage did not match provided hash " + Utils.bytesToHex(entry.getKeyData()) + " " + Utils.bytesToHex(entry.getData()));
+                    }
+                    this.ripeMd160Preimage = entry.getData();
+                    log.debug("Found input RIPEMD160 preimage " + Utils.bytesToHex(entry.getData()));
+                    break;
+                case PSBT_IN_SHA256:
+                    entry.checkOneBytePlusSha256Key();
+                    if(!Arrays.equals(entry.getKeyData(), Sha256Hash.hash(entry.getData()))) {
+                        throw new PSBTParseException("Hash of PSBT_IN_SHA256 preimage did not match provided hash " + Utils.bytesToHex(entry.getKeyData()) + " " + Utils.bytesToHex(entry.getData()));
+                    }
+                    this.sha256Preimage = entry.getData();
+                    log.debug("Found input SHA256 preimage " + Utils.bytesToHex(entry.getData()));
+                    break;
+                case PSBT_IN_HASH160:
+                    entry.checkOneBytePlusRipe160Key();
+                    if(!Arrays.equals(entry.getKeyData(), Utils.sha256hash160(entry.getData()))) {
+                        throw new PSBTParseException("Hash of PSBT_IN_HASH160 preimage did not match provided hash " + Utils.bytesToHex(entry.getKeyData()) + " " + Utils.bytesToHex(entry.getData()));
+                    }
+                    this.hash160Preimage = entry.getData();
+                    log.debug("Found input HASH160 preimage " + Utils.bytesToHex(entry.getData()));
+                    break;
+                case PSBT_IN_HASH256:
+                    entry.checkOneBytePlusSha256Key();
+                    if(!Arrays.equals(entry.getKeyData(), Sha256Hash.hashTwice(entry.getData()))) {
+                        throw new PSBTParseException("Hash of PSBT_IN_HASH256 preimage did not match provided hash " + Utils.bytesToHex(entry.getKeyData()) + " " + Utils.bytesToHex(entry.getData()));
+                    }
+                    this.hash256Preimage = entry.getData();
+                    log.debug("Found input HASH256 preimage " + Utils.bytesToHex(entry.getData()));
+                    break;
+                case PSBT_IN_PREVIOUS_TXID:
+                    entry.checkOneByteKey();
+                    this.prevTxid = Sha256Hash.wrap(Utils.reverseBytes(entry.getData()));
+                    log.debug("Found input previous txid " + Utils.bytesToHex(entry.getData()));
+                    break;
+                case PSBT_IN_OUTPUT_INDEX:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT input output index must be 4 bytes");
+                    }
+                    this.prevIndex = Utils.readUint32(entry.getData(), 0);
+                    log.debug("Found input previous output index " + this.prevIndex);
+                    break;
+                case PSBT_IN_SEQUENCE:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT input sequence must be 4 bytes");
+                    }
+                    this.sequence = Utils.readUint32(entry.getData(), 0);
+                    log.debug("Found input sequence " + this.sequence);
+                    break;
+                case PSBT_IN_REQUIRED_TIME_LOCKTIME:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT input required time locktime must be 4 bytes");
+                    }
+                    long requiredTimeLocktime = Utils.readUint32(entry.getData(), 0);
+                    if(requiredTimeLocktime < 500000000) {
+                        throw new PSBTParseException("Required time locktime is less than 500000000");
+                    }
+                    this.requiredTimeLocktime = requiredTimeLocktime;
+                    log.debug("Found input required time locktime " + this.requiredTimeLocktime);
+                    break;
+                case PSBT_IN_REQUIRED_HEIGHT_LOCKTIME:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT input required height locktime must be 4 bytes");
+                    }
+                    long requiredHeightLocktime = Utils.readUint32(entry.getData(), 0);
+                    if(requiredHeightLocktime >= 500000000) {
+                        throw new PSBTParseException("Required time locktime is greater than or equal to 500000000");
+                    }
+                    this.requiredHeightLocktime = requiredHeightLocktime;
+                    log.debug("Found input required height locktime " + this.requiredHeightLocktime);
+                    break;
+                case PSBT_IN_SP_ECDH_SHARE:
+                    entry.checkOneBytePlusPubKey();
+                    if(entry.getData().length != 33) {
+                        throw new PSBTParseException("PSBT input silent payments ECDH share data must be 33 bytes");
+                    }
+                    ECKey inputScanKey = ECKey.fromPublicOnly(entry.getKeyData());
+                    ECKey inputEcdhShare = ECKey.fromPublicOnly(entry.getData());
+                    this.silentPaymentsEcdhShares.put(inputScanKey, inputEcdhShare);
+                    log.debug("Found input silent payments ECDH share for scan key: " + Utils.bytesToHex(entry.getKeyData()));
+                    break;
+                case PSBT_IN_SP_DLEQ:
+                    entry.checkOneBytePlusPubKey();
+                    if(entry.getData().length != 64) {
+                        throw new PSBTParseException("PSBT input silent payments DLEQ proof data must be 64 bytes");
+                    }
+                    ECKey inputProofScanKey = ECKey.fromPublicOnly(entry.getKeyData());
+                    SilentPaymentsDLEQProof inputDleqProof = SilentPaymentsDLEQProof.fromBytes(entry.getData());
+                    this.silentPaymentsDLEQProofs.put(inputProofScanKey, inputDleqProof);
+                    log.debug("Found input silent payments DLEQ proof for scan key: " + Utils.bytesToHex(entry.getKeyData()));
+                    break;
+                case PSBT_IN_SP_SPEND_BIP32_DERIVATION:
+                    entry.checkOneBytePlusPubKey();
+                    ECKey spSpendPubKey = ECKey.fromPublicOnly(entry.getKeyData());
+                    KeyDerivation spSpendKeyDerivation = PSBTEntry.parseKeyDerivation(entry.getData());
+                    this.silentPaymentsSpendDerivations.put(spSpendPubKey, spSpendKeyDerivation);
+                    log.debug("Found input silent payments BIP32 derivation for spend key: " + Utils.bytesToHex(entry.getKeyData()));
+                    break;
+                case PSBT_IN_SP_TWEAK:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 32) {
+                        throw new PSBTParseException("PSBT input silent payments tweak must be 32 bytes");
+                    }
+                    this.silentPaymentsTweak = entry.getData();
+                    log.debug("Found input silent payments tweak");
+                    break;
                 case PSBT_IN_PROPRIETARY:
                     this.proprietary.put(Utils.bytesToHex(entry.getKeyData()), Utils.bytesToHex(entry.getData()));
                     log.debug("Found proprietary input " + Utils.bytesToHex(entry.getKeyData()) + ": " + Utils.bytesToHex(entry.getData()));
@@ -245,12 +411,9 @@ public class PSBTInput {
                     log.warn("PSBT input not recognized key type: " + entry.getKeyType());
             }
         }
-
-        this.transaction = transaction;
-        this.index = index;
     }
 
-    public List<PSBTEntry> getInputEntries() {
+    public List<PSBTEntry> getInputEntries(int psbtVersion) {
         List<PSBTEntry> entries = new ArrayList<>();
 
         if(nonWitnessUtxo != null) {
@@ -296,6 +459,44 @@ public class PSBTInput {
             entries.add(populateEntry(PSBT_IN_POR_COMMITMENT, null, porCommitment.getBytes(StandardCharsets.UTF_8)));
         }
 
+        if(psbtVersion >= 2) {
+            if(prevTxid != null) {
+                entries.add(populateEntry(PSBT_IN_PREVIOUS_TXID, null, Utils.reverseBytes(prevTxid.getBytes())));
+            }
+            if(prevIndex != null) {
+                byte[] prevIndexBytes = new byte[4];
+                Utils.uint32ToByteArrayLE(prevIndex, prevIndexBytes, 0);
+                entries.add(populateEntry(PSBT_IN_OUTPUT_INDEX, null, prevIndexBytes));
+            }
+            if(sequence != null) {
+                byte[] sequenceBytes = new byte[4];
+                Utils.uint32ToByteArrayLE(sequence, sequenceBytes, 0);
+                entries.add(populateEntry(PSBT_IN_SEQUENCE, null, sequenceBytes));
+            }
+            if(requiredTimeLocktime != null) {
+                byte[] requiredTimeLocktimeBytes = new byte[4];
+                Utils.uint32ToByteArrayLE(requiredTimeLocktime, requiredTimeLocktimeBytes, 0);
+                entries.add(populateEntry(PSBT_IN_REQUIRED_TIME_LOCKTIME, null, requiredTimeLocktimeBytes));
+            }
+            if(requiredHeightLocktime != null) {
+                byte[] requiredHeightLocktimeBytes = new byte[4];
+                Utils.uint32ToByteArrayLE(requiredHeightLocktime, requiredHeightLocktimeBytes, 0);
+                entries.add(populateEntry(PSBT_IN_REQUIRED_HEIGHT_LOCKTIME, null, requiredHeightLocktimeBytes));
+            }
+            for(Map.Entry<ECKey, ECKey> entry : silentPaymentsEcdhShares.entrySet()) {
+                entries.add(populateEntry(PSBT_IN_SP_ECDH_SHARE, entry.getKey().getPubKey(), entry.getValue().getPubKey()));
+            }
+            for(Map.Entry<ECKey, SilentPaymentsDLEQProof> entry : silentPaymentsDLEQProofs.entrySet()) {
+                entries.add(populateEntry(PSBT_IN_SP_DLEQ, entry.getKey().getPubKey(), entry.getValue().getBytes()));
+            }
+            for(Map.Entry<ECKey, KeyDerivation> entry : silentPaymentsSpendDerivations.entrySet()) {
+                entries.add(populateEntry(PSBT_IN_SP_SPEND_BIP32_DERIVATION, entry.getKey().getPubKey(), serializeKeyDerivation(entry.getValue())));
+            }
+            if(silentPaymentsTweak != null) {
+                entries.add(populateEntry(PSBT_IN_SP_TWEAK, null, silentPaymentsTweak));
+            }
+        }
+
         for(Map.Entry<String, String> entry : proprietary.entrySet()) {
             entries.add(populateEntry(PSBT_IN_PROPRIETARY, Utils.hexToBytes(entry.getKey()), Utils.hexToBytes(entry.getValue())));
         }
@@ -346,6 +547,51 @@ public class PSBTInput {
             porCommitment = psbtInput.porCommitment;
         }
 
+        if(psbtInput.ripeMd160Preimage != null) {
+            ripeMd160Preimage = psbtInput.ripeMd160Preimage;
+        }
+
+        if(psbtInput.sha256Preimage != null) {
+            sha256Preimage = psbtInput.sha256Preimage;
+        }
+
+        if(psbtInput.hash160Preimage != null) {
+            hash160Preimage = psbtInput.hash160Preimage;
+        }
+
+        if(psbtInput.hash256Preimage != null) {
+            hash256Preimage = psbtInput.hash256Preimage;
+        }
+
+        if(psbtInput.prevTxid != null) {
+            prevTxid = psbtInput.prevTxid;
+        }
+
+        if(psbtInput.prevIndex != null) {
+            prevIndex = psbtInput.prevIndex;
+        }
+
+        if(psbtInput.sequence != null) {
+            sequence = psbtInput.sequence;
+        }
+
+        if(psbtInput.requiredTimeLocktime != null) {
+            requiredTimeLocktime = psbtInput.requiredTimeLocktime;
+        }
+
+        if(psbtInput.requiredHeightLocktime != null) {
+            requiredHeightLocktime = psbtInput.requiredHeightLocktime;
+        }
+
+        silentPaymentsEcdhShares.putAll(psbtInput.silentPaymentsEcdhShares);
+        silentPaymentsDLEQProofs.putAll(psbtInput.silentPaymentsDLEQProofs);
+
+        silentPaymentsSpendDerivations.putAll(psbtInput.silentPaymentsSpendDerivations);
+
+        if(psbtInput.silentPaymentsTweak != null) {
+            silentPaymentsTweak = psbtInput.silentPaymentsTweak;
+        }
+
         proprietary.putAll(psbtInput.proprietary);
 
         if(psbtInput.tapKeyPathSignature != null) {
@@ -481,6 +727,122 @@ public class PSBTInput {
         return getUtxo() != null && getScriptType() == P2TR;
     }
 
+    public byte[] getRipeMd160Preimage() {
+        return ripeMd160Preimage;
+    }
+
+    public void setRipeMd160Preimage(byte[] ripeMd160Preimage) {
+        this.ripeMd160Preimage = ripeMd160Preimage;
+    }
+
+    public byte[] getSha256Preimage() {
+        return sha256Preimage;
+    }
+
+    public void setSha256Preimage(byte[] sha256Preimage) {
+        this.sha256Preimage = sha256Preimage;
+    }
+
+    public byte[] getHash160Preimage() {
+        return hash160Preimage;
+    }
+
+    public void setHash160Preimage(byte[] hash160Preimage) {
+        this.hash160Preimage = hash160Preimage;
+    }
+
+    public byte[] getHash256Preimage() {
+        return hash256Preimage;
+    }
+
+    public void setHash256Preimage(byte[] hash256Preimage) {
+        this.hash256Preimage = hash256Preimage;
+    }
+
+    public Sha256Hash getPrevTxid() {
+        if(psbt.getPsbtVersion() >= 2) {
+            return prevTxid;
+        }
+
+        return getInput().getOutpoint().getHash();
+    }
+
+    Sha256Hash prevTxid() {
+        return prevTxid;
+    }
+
+    public void setPrevTxid(Sha256Hash prevTxid) {
+        this.prevTxid = prevTxid;
+    }
+
+    public Long getPrevIndex() {
+        if(psbt.getPsbtVersion() >= 2) {
+            return prevIndex;
+        }
+
+        return getInput().getOutpoint().getIndex();
+    }
+
+    Long prevIndex() {
+        return prevIndex;
+    }
+
+    public void setPrevIndex(Long prevIndex) {
+        this.prevIndex = prevIndex;
+    }
+
+    public Long getSequence() {
+        if(psbt.getPsbtVersion() >= 2) {
+            return sequence;
+        }
+
+        return getInput().getSequenceNumber();
+    }
+
+    Long sequence() {
+        return sequence;
+    }
+
+    public void setSequence(Long sequence) {
+        this.sequence = sequence;
+    }
+
+    public Long getRequiredTimeLocktime() {
+        return requiredTimeLocktime;
+    }
+
+    public void setRequiredTimeLocktime(Long requiredTimeLocktime) {
+        this.requiredTimeLocktime = requiredTimeLocktime;
+    }
+
+    public Long getRequiredHeightLocktime() {
+        return requiredHeightLocktime;
+    }
+
+    public void setRequiredHeightLocktime(Long requiredHeightLocktime) {
+        this.requiredHeightLocktime = requiredHeightLocktime;
+    }
+
+    public Map<ECKey, ECKey> getSilentPaymentsEcdhShares() {
+        return silentPaymentsEcdhShares;
+    }
+
+    public Map<ECKey, SilentPaymentsDLEQProof> getSilentPaymentsDLEQProofs() {
+        return silentPaymentsDLEQProofs;
+    }
+
+    public Map<ECKey, KeyDerivation> getSilentPaymentsSpendDerivations() {
+        return silentPaymentsSpendDerivations;
+    }
+
+    public byte[] getSilentPaymentsTweak() {
+        return silentPaymentsTweak;
+    }
+
+    public void setSilentPaymentsTweak(byte[] silentPaymentsTweak) {
+        this.silentPaymentsTweak = silentPaymentsTweak;
+    }
+
     public boolean isSigned() {
         if(getTapKeyPathSignature() != null) {
             return true;
@@ -518,6 +880,26 @@ public class PSBTInput {
         return SigHash.ALL;
     }
 
+    public boolean signSilentPayments(ECKey spendPrivateKey) {
+        if(getSilentPaymentsTweak() == null || getWitnessUtxo() == null) {
+            return false;
+        }
+
+        ECKey tweakKey = ECKey.fromPrivate(getSilentPaymentsTweak());
+        ECKey tweakedKey = spendPrivateKey.addPrivate(tweakKey);
+
+        if(tweakedKey.hasOddYCoord()) {
+            tweakedKey = tweakedKey.negatePrivate();
+        }
+
+        ECKey outputKey = ScriptType.P2TR.getPublicKeyFromScript(getWitnessUtxo().getScript());
+        if(!Arrays.equals(tweakedKey.getPubKeyXCoord(), outputKey.getPubKeyXCoord())) {
+            throw new IllegalStateException("Tweaked spend key does not match output key");
+        }
+
+        return sign(tweakedKey);
+    }
+
     public boolean sign(ECKey privKey) {
         return sign(new PSBTInputSigner() {
             @Override
@@ -541,6 +923,12 @@ public class PSBTInput {
         if(getNonWitnessUtxo() != null || getWitnessUtxo() != null) {
             Script signingScript = getSigningScript();
             if(signingScript != null) {
+                if((localSigHash == SigHash.SINGLE || localSigHash == SigHash.ANYONECANPAY_SINGLE) && index >= psbt.getTransaction().getOutputs().size()
+                        && Arrays.asList(NON_WITNESS_TYPES).contains(getScriptType())) {
+                    throw new IllegalStateException("Refusing to sign SIGHASH_SINGLE on legacy input " + index
+                            + " with only " + psbt.getTransaction().getOutputs().size() + " output(s) as it would produce a re-broadcastable signature");
+                }
+
                 Sha256Hash hash = getHashForSignature(signingScript, localSigHash);
                 TransactionSignature.Type type = isTaproot() ? SCHNORR : ECDSA;
                 TransactionSignature transactionSignature = psbtInputSigner.sign(hash, localSigHash, type);
@@ -559,6 +947,27 @@ public class PSBTInput {
         return false;
     }
 
+    void verifySigHash() throws PSBTSignatureException {
+        if(sigHash == null || sigHash == SigHash.ALL || sigHash == SigHash.DEFAULT) {
+            return;
+        }
+
+        switch(sigHash) {
+            case NONE:
+                throw new PSBTSignatureException("Input " + index + " requests SIGHASH_NONE. The signature does not commit to any of the outputs, and can be re-used on a transaction with completely different outputs.");
+            case ANYONECANPAY_NONE:
+                throw new PSBTSignatureException("Input " + index + " requests SIGHASH_NONE | ANYONECANPAY. The signature commits to neither inputs nor outputs and can be re-used in nearly any transaction.");
+            case ANYONECANPAY_SINGLE:
+                throw new PSBTSignatureException("Input " + index + " requests SIGHASH_SINGLE | ANYONECANPAY. The signature only commits to one output, and other inputs may be added after signing.");
+            case SINGLE:
+                throw new PSBTSignatureException("Input " + index + " requests SIGHASH_SINGLE. The signature only commits to the output at the same index, allowing other outputs to be added or modified after signing.");
+            case ANYONECANPAY_ALL:
+                throw new PSBTSignatureException("Input " + index + " requests SIGHASH_ALL | ANYONECANPAY. Other inputs may be added to the transaction after signing, potentially redirecting value through fees.");
+            case ANYONECANPAY:
+                throw new PSBTSignatureException("Input " + index + " requests a non-standard ANYONECANPAY sighash with no base type. The resulting signature has unpredictable commitment semantics.");
+        }
+    }
+
     boolean verifySignatures() throws PSBTSignatureException {
         SigHash localSigHash = getSigHash();
         if(localSigHash == null) {
@@ -633,6 +1042,8 @@ public class PSBTInput {
             return p2sh ? P2SH_P2WPKH : P2WPKH;
         } else if(P2WSH.isScriptType(signingScript)) {
             return p2sh ? P2SH_P2WSH : P2WSH;
+        } else if(MULTISIG.isScriptType(signingScript)) {
+            return p2sh ? P2SH : MULTISIG;
         }
 
         return ScriptType.getType(signingScript);
@@ -676,7 +1087,7 @@ public class PSBTInput {
     }
 
     public TransactionInput getInput() {
-        return transaction.getInputs().get(index);
+        return psbt.getTransaction().getInputs().get(index);
     }
 
     public TransactionOutput getUtxo() {
@@ -684,6 +1095,10 @@ public class PSBTInput {
         return getWitnessUtxo() != null ? getWitnessUtxo() : (getNonWitnessUtxo() != null ?  getNonWitnessUtxo().getOutputs().get(vout) : null);
     }
 
+    int getIndex() {
+        return index;
+    }
+
     void setIndex(int index) {
         this.index = index;
     }
@@ -697,6 +1112,10 @@ public class PSBTInput {
         proprietary.clear();
         tapDerivedPublicKeys.clear();
         tapKeyPathSignature = null;
+        silentPaymentsEcdhShares.clear();
+        silentPaymentsDLEQProofs.clear();
+        silentPaymentsSpendDerivations.clear();
+        silentPaymentsTweak = null;
     }
 
     private Sha256Hash getHashForSignature(Script connectedScript, SigHash localSigHash) {
@@ -705,12 +1124,12 @@ public class PSBTInput {
         ScriptType scriptType = getScriptType();
         if(scriptType == ScriptType.P2TR) {
             List<TransactionOutput> spentUtxos = psbt.getPsbtInputs().stream().map(PSBTInput::getUtxo).collect(Collectors.toList());
-            hash = transaction.hashForTaprootSignature(spentUtxos, index, !P2TR.isScriptType(connectedScript), connectedScript, localSigHash, null);
+            hash = psbt.getTransaction().hashForTaprootSignature(spentUtxos, index, !P2TR.isScriptType(connectedScript), connectedScript, localSigHash, null);
         } else if(Arrays.asList(WITNESS_TYPES).contains(scriptType)) {
             long prevValue = getUtxo().getValue();
-            hash = transaction.hashForWitnessSignature(index, connectedScript, prevValue, localSigHash);
+            hash = psbt.getTransaction().hashForWitnessSignature(index, connectedScript, prevValue, localSigHash);
         } else {
-            hash = transaction.hashForLegacySignature(index, connectedScript, localSigHash);
+            hash = psbt.getTransaction().hashForLegacySignature(index, connectedScript, localSigHash);
         }
 
         return hash;

src/main/java/com/sparrowwallet/drongo/psbt/PSBTOutput.java

@@ -3,13 +3,18 @@ package com.sparrowwallet.drongo.psbt;
 import com.sparrowwallet.drongo.KeyDerivation;
 import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.crypto.ECKey;
-import com.sparrowwallet.drongo.protocol.Script;
-import com.sparrowwallet.drongo.protocol.ScriptType;
-import com.sparrowwallet.drongo.protocol.Sha256Hash;
+import com.sparrowwallet.drongo.dns.DnsPayment;
+import com.sparrowwallet.drongo.dns.DnsPaymentResolver;
+import com.sparrowwallet.drongo.dns.DnsPaymentValidationException;
+import com.sparrowwallet.drongo.protocol.*;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentAddress;
+import com.sparrowwallet.drongo.uri.BitcoinURIParseException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.*;
+import java.util.concurrent.ExecutionException;
 
 import static com.sparrowwallet.drongo.protocol.ScriptType.*;
 import static com.sparrowwallet.drongo.psbt.PSBTEntry.*;
@@ -18,8 +23,13 @@ public class PSBTOutput {
     public static final byte PSBT_OUT_REDEEM_SCRIPT = 0x00;
     public static final byte PSBT_OUT_WITNESS_SCRIPT = 0x01;
     public static final byte PSBT_OUT_BIP32_DERIVATION = 0x02;
+    public static final byte PSBT_OUT_AMOUNT = 0x03;
+    public static final byte PSBT_OUT_SCRIPT = 0x04;
     public static final byte PSBT_OUT_TAP_INTERNAL_KEY = 0x05;
     public static final byte PSBT_OUT_TAP_BIP32_DERIVATION = 0x07;
+    public static final byte PSBT_OUT_SP_V0_INFO = 0x09;
+    public static final byte PSBT_OUT_SP_V0_LABEL = 0x0a;
+    public static final byte PSBT_OUT_DNSSEC_PROOF = 0x35;
     public static final byte PSBT_OUT_PROPRIETARY = (byte)0xfc;
 
     private Script redeemScript;
@@ -28,14 +38,28 @@ public class PSBTOutput {
     private final Map<String, String> proprietary = new LinkedHashMap<>();
     private Map<ECKey, Map<KeyDerivation, List<Sha256Hash>>> tapDerivedPublicKeys = new LinkedHashMap<>();
     private ECKey tapInternalKey;
+    private Map<String, byte[]> dnssecProof;
+
+    //PSBTv2-only fields
+    private Long amount;
+    private Script script;
+    private SilentPaymentAddress silentPaymentAddress;
+    private Long silentPaymentLabel;
 
     private static final Logger log = LoggerFactory.getLogger(PSBTOutput.class);
 
-    PSBTOutput() {
-        //empty constructor
+    private final PSBT psbt;
+    private int index;
+
+    PSBTOutput(PSBT psbt, int index) {
+        this.psbt = psbt;
+        this.index = index;
     }
 
-    PSBTOutput(ScriptType scriptType, Script redeemScript, Script witnessScript, Map<ECKey, KeyDerivation> derivedPublicKeys, Map<String, String> proprietary, ECKey tapInternalKey) {
+    PSBTOutput(PSBT psbt, int index, ScriptType scriptType, Long amount, Script script, Script redeemScript, Script witnessScript, Map<ECKey, KeyDerivation> derivedPublicKeys,
+               Map<String, String> proprietary, ECKey tapInternalKey, SilentPaymentAddress silentPaymentAddress, Long silentPaymentLabel, Map<String, byte[]> dnssecProof) {
+        this(psbt, index);
+
         this.redeemScript = redeemScript;
         this.witnessScript = witnessScript;
 
@@ -51,11 +75,24 @@ public class PSBTOutput {
             KeyDerivation tapKeyDerivation = derivedPublicKeys.values().iterator().next();
             tapDerivedPublicKeys.put(this.tapInternalKey, Map.of(tapKeyDerivation, Collections.emptyList()));
         }
+
+        this.silentPaymentAddress = silentPaymentAddress;
+        this.silentPaymentLabel = silentPaymentLabel;
+        this.dnssecProof = dnssecProof;
+
+        //Populate PSBTv2 fields if parent PSBT is v2
+        if(psbt.getPsbtVersion() >= 2) {
+            this.amount = amount;
+            if(!script.isEmpty() || silentPaymentAddress == null) {
+                this.script = script;
+            }
+        }
     }
 
-    PSBTOutput(List<PSBTEntry> outputEntries) throws PSBTParseException {
+    PSBTOutput(PSBT psbt, List<PSBTEntry> outputEntries, int index) throws PSBTParseException {
+        this(psbt, index);
         for(PSBTEntry entry : outputEntries) {
-            switch (entry.getKeyType()) {
+            switch((byte)entry.getKeyType()) {
                 case PSBT_OUT_REDEEM_SCRIPT:
                     entry.checkOneByteKey();
                     Script redeemScript = new Script(entry.getData());
@@ -75,6 +112,20 @@ public class PSBTOutput {
                     this.derivedPublicKeys.put(derivedPublicKey, keyDerivation);
                     log.debug("Found output bip32_derivation with master fingerprint " + keyDerivation.getMasterFingerprint() + " at path " + keyDerivation.getDerivationPath() + " public key " + derivedPublicKey);
                     break;
+                case PSBT_OUT_AMOUNT:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 8) {
+                        throw new PSBTParseException("PSBT output amount must be 8 bytes");
+                    }
+                    this.amount = Utils.readInt64(entry.getData(), 0);
+                    log.debug("Found output amount " + this.amount);
+                    break;
+                case PSBT_OUT_SCRIPT:
+                    entry.checkOneByteKey();
+                    Script script = new Script(entry.getData());
+                    this.script = script;
+                    log.debug("Found output script hex " + Utils.bytesToHex(script.getProgram()) + " script " + script);
+                    break;
                 case PSBT_OUT_PROPRIETARY:
                     proprietary.put(Utils.bytesToHex(entry.getKeyData()), Utils.bytesToHex(entry.getData()));
                     log.debug("Found proprietary output " + Utils.bytesToHex(entry.getKeyData()) + ": " + Utils.bytesToHex(entry.getData()));
@@ -97,13 +148,37 @@ public class PSBTOutput {
                         }
                     }
                     break;
+                case PSBT_OUT_SP_V0_INFO:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 66) {
+                        throw new PSBTParseException("PSBT output info data for silent payments address must contain 66 bytes");
+                    }
+                    byte[] scanKey = new byte[33];
+                    System.arraycopy(entry.getData(), 0, scanKey, 0, 33);
+                    byte[] spendKey = new byte[33];
+                    System.arraycopy(entry.getData(), 33, spendKey, 0, 33);
+                    this.silentPaymentAddress = new SilentPaymentAddress(ECKey.fromPublicOnly(scanKey), ECKey.fromPublicOnly(spendKey));
+                    log.debug("Found output silent payment address " + this.silentPaymentAddress);
+                    break;
+                case PSBT_OUT_SP_V0_LABEL:
+                    entry.checkOneByteKey();
+                    if(entry.getData().length != 4) {
+                        throw new PSBTParseException("PSBT output silent payment label must be 4 bytes");
+                    }
+                    this.silentPaymentLabel = Utils.readUint32(entry.getData(), 0);
+                    log.debug("Found output silent payment label " + this.silentPaymentLabel);
+                    break;
+                case PSBT_OUT_DNSSEC_PROOF:
+                    entry.checkOneByteKey();
+                    this.dnssecProof = parseDnssecProof(entry.getData());
+                    break;
                 default:
                     log.warn("PSBT output not recognized key type: " + entry.getKeyType());
             }
         }
     }
 
-    public List<PSBTEntry> getOutputEntries() {
+    public List<PSBTEntry> getOutputEntries(int psbtVersion) {
         List<PSBTEntry> entries = new ArrayList<>();
 
         if(redeemScript != null) {
@@ -118,6 +193,25 @@ public class PSBTOutput {
             entries.add(populateEntry(PSBT_OUT_BIP32_DERIVATION, entry.getKey().getPubKey(), serializeKeyDerivation(entry.getValue())));
         }
 
+        if(psbtVersion >= 2) {
+            if(amount != null) {
+                byte[] amountBytes = new byte[8];
+                Utils.int64ToByteArrayLE(amount, amountBytes, 0);
+                entries.add(populateEntry(PSBT_OUT_AMOUNT, null, amountBytes));
+            }
+            if(script != null) {
+                entries.add(populateEntry(PSBT_OUT_SCRIPT, null, script.getProgram()));
+            }
+            if(silentPaymentAddress != null) {
+                entries.add(populateEntry(PSBT_OUT_SP_V0_INFO, null, Utils.concat(silentPaymentAddress.getScanKey().getPubKey(), silentPaymentAddress.getSpendKey().getPubKey())));
+            }
+            if(silentPaymentLabel != null) {
+                byte[] labelBytes = new byte[4];
+                Utils.uint32ToByteArrayLE(silentPaymentLabel, labelBytes, 0);
+                entries.add(populateEntry(PSBT_OUT_SP_V0_LABEL, null, labelBytes));
+            }
+        }
+
         for(Map.Entry<String, String> entry : proprietary.entrySet()) {
             entries.add(populateEntry(PSBT_OUT_PROPRIETARY, Utils.hexToBytes(entry.getKey()), Utils.hexToBytes(entry.getValue())));
         }
@@ -132,6 +226,10 @@ public class PSBTOutput {
             entries.add(populateEntry(PSBT_OUT_TAP_INTERNAL_KEY, null, tapInternalKey.getPubKeyXCoord()));
         }
 
+        if(dnssecProof != null) {
+            entries.add(populateEntry(PSBT_OUT_DNSSEC_PROOF, null, serializeDnssecProof(dnssecProof)));
+        }
+
         return entries;
     }
 
@@ -145,13 +243,30 @@ public class PSBTOutput {
         }
 
         derivedPublicKeys.putAll(psbtOutput.derivedPublicKeys);
-        proprietary.putAll(psbtOutput.proprietary);
+
+        if(psbtOutput.amount != null) {
+            amount = psbtOutput.amount;
+        }
+
+        if(psbtOutput.script != null) {
+            script = psbtOutput.script;
+        }
 
         tapDerivedPublicKeys.putAll(psbtOutput.tapDerivedPublicKeys);
 
         if(psbtOutput.tapInternalKey != null) {
             tapInternalKey = psbtOutput.tapInternalKey;
         }
+
+        if(psbtOutput.silentPaymentAddress != null) {
+            silentPaymentAddress = psbtOutput.silentPaymentAddress;
+        }
+
+        if(psbtOutput.silentPaymentLabel != null) {
+            silentPaymentLabel = psbtOutput.silentPaymentLabel;
+        }
+
+        proprietary.putAll(psbtOutput.proprietary);
     }
 
     public Script getRedeemScript() {
@@ -178,6 +293,38 @@ public class PSBTOutput {
         return derivedPublicKeys;
     }
 
+    public Long getAmount() {
+        if(psbt.getPsbtVersion() >= 2) {
+            return amount;
+        }
+
+        return getOutput().getValue();
+    }
+
+    Long amount() {
+        return amount;
+    }
+
+    public void setAmount(Long amount) {
+        this.amount = amount;
+    }
+
+    public Script getScript() {
+        if(psbt.getPsbtVersion() >= 2) {
+            return script;
+        }
+
+        return getOutput().getScript();
+    }
+
+    Script script() {
+        return script;
+    }
+
+    public void setScript(Script script) {
+        this.script = script;
+    }
+
     public Map<String, String> getProprietary() {
         return proprietary;
     }
@@ -198,6 +345,48 @@ public class PSBTOutput {
         this.tapInternalKey = tapInternalKey;
     }
 
+    public SilentPaymentAddress getSilentPaymentAddress() {
+        return silentPaymentAddress;
+    }
+
+    public void setSilentPaymentAddress(SilentPaymentAddress silentPaymentAddress) {
+        this.silentPaymentAddress = silentPaymentAddress;
+    }
+
+    public Long getSilentPaymentLabel() {
+        return silentPaymentLabel;
+    }
+
+    public void setSilentPaymentLabel(Long silentPaymentLabel) {
+        this.silentPaymentLabel = silentPaymentLabel;
+    }
+
+    public Map<String, byte[]> getDnssecProof() {
+        return dnssecProof;
+    }
+
+    public Optional<DnsPayment> getDnsPayment() throws DnsPaymentValidationException, IOException, BitcoinURIParseException, ExecutionException, InterruptedException {
+        if(dnssecProof == null || dnssecProof.isEmpty()) {
+            return Optional.empty();
+        }
+
+        String hrn = dnssecProof.keySet().iterator().next();
+        DnsPaymentResolver resolver = new DnsPaymentResolver(hrn);
+        return resolver.resolve(dnssecProof.get(hrn));
+    }
+
+    public void setDnssecProof(Map<String, byte[]> dnssecProof) {
+        this.dnssecProof = dnssecProof;
+    }
+
+    public TransactionOutput getOutput() {
+        return psbt.getTransaction().getOutputs().get(index);
+    }
+
+    void setIndex(int index) {
+        this.index = index;
+    }
+
     public void clearNonFinalFields() {
         tapDerivedPublicKeys.clear();
     }

src/main/java/com/sparrowwallet/drongo/psbt/PSBTProofException.java

@@ -0,0 +1,19 @@
+package com.sparrowwallet.drongo.psbt;
+
+public class PSBTProofException extends PSBTParseException {
+    public PSBTProofException() {
+        super();
+    }
+
+    public PSBTProofException(String message) {
+        super(message);
+    }
+
+    public PSBTProofException(Throwable cause) {
+        super(cause);
+    }
+
+    public PSBTProofException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/InvalidSilentPaymentException.java

@@ -0,0 +1,11 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+public class InvalidSilentPaymentException extends Exception {
+    public InvalidSilentPaymentException(String message) {
+        super(message);
+    }
+
+    public InvalidSilentPaymentException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPayment.java

@@ -0,0 +1,52 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.address.P2TRAddress;
+import com.sparrowwallet.drongo.protocol.ScriptType;
+import com.sparrowwallet.drongo.wallet.Payment;
+
+import java.util.Set;
+
+public class SilentPayment extends Payment {
+    public static final Set<ScriptType> VALID_INPUT_SCRIPT_TYPES = Set.of(ScriptType.P2PKH, ScriptType.P2SH_P2WPKH, ScriptType.P2WPKH, ScriptType.P2TR);
+
+    private final SilentPaymentAddress silentPaymentAddress;
+
+    public SilentPayment(SilentPaymentAddress silentPaymentAddress, String label, long amount, boolean sendMax) {
+        this(silentPaymentAddress, getDummyAddress(), label, amount, sendMax);
+    }
+
+    public SilentPayment(SilentPaymentAddress silentPaymentAddress, String label, long amount, boolean sendMax, Type type) {
+        this(silentPaymentAddress, getDummyAddress(), label, amount, sendMax, type);
+    }
+
+    public SilentPayment(SilentPaymentAddress silentPaymentAddress, Address address, String label, long amount, boolean sendMax) {
+        this(silentPaymentAddress, address, label, amount, sendMax, Type.DEFAULT);
+    }
+
+    public SilentPayment(SilentPaymentAddress silentPaymentAddress, Address address, String label, long amount, boolean sendMax, Type type) {
+        super(address == null ? getDummyAddress() : address, label, amount, sendMax, type);
+        this.silentPaymentAddress = silentPaymentAddress;
+    }
+
+    public static Address getDummyAddress() {
+        return new P2TRAddress(new byte[32]);
+    }
+
+    public boolean isAddressComputed() {
+        return !getAddress().equals(getDummyAddress());
+    }
+
+    public SilentPaymentAddress getSilentPaymentAddress() {
+        return silentPaymentAddress;
+    }
+
+    @Override
+    public String getDisplayAddress() {
+        if(!isAddressComputed()) {
+            return silentPaymentAddress.toAbbreviatedString();
+        }
+
+        return super.getDisplayAddress();
+    }
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentAddress.java

@@ -0,0 +1,110 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.protocol.Bech32;
+
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+
+public class SilentPaymentAddress {
+    public static final int VERSION = 0;
+
+    private final ECKey scanAddress;
+    private final ECKey spendAddress;
+
+    public SilentPaymentAddress(ECKey scanAddress, ECKey spendAddress) {
+        this.scanAddress = scanAddress;
+        this.spendAddress = spendAddress;
+    }
+
+    public ECKey getScanKey() {
+        return scanAddress;
+    }
+
+    public ECKey getSpendKey() {
+        return spendAddress;
+    }
+
+    public String getAddress() {
+        byte[] keys = Utils.concat(scanAddress.getPubKey(), spendAddress.getPubKey());
+        return Bech32.encode(Network.get().getSilentPaymentsAddressHrp(), VERSION, Bech32.Encoding.BECH32M, keys);
+    }
+
+    public static SilentPaymentAddress from(String address) {
+        Bech32.Bech32Data data = Bech32.decode(address, 1023);
+        if(data.encoding != Bech32.Encoding.BECH32M) {
+            throw new IllegalArgumentException("Invalid silent payments address encoding");
+        }
+
+        if(!Network.get().getSilentPaymentsAddressHrp().equals(data.hrp)) {
+            throw new IllegalArgumentException("Invalid silent payments address hrp");
+        }
+
+        int witnessVersion = data.data[0];
+        if(witnessVersion != VERSION) {
+            throw new UnsupportedOperationException("Unsupported silent payments address witness version");
+        }
+
+        byte[] convertedProgram = Arrays.copyOfRange(data.data, 1, data.data.length);
+        byte[] witnessProgram = Bech32.convertBits(convertedProgram, 0, convertedProgram.length, 5, 8, false);
+
+        if(witnessProgram.length != 66) {
+            throw new IllegalArgumentException("Invalid silent payments address witness length");
+        }
+
+        ECKey scanPubKey = ECKey.fromPublicOnly(Arrays.copyOfRange(witnessProgram, 0, 33));
+        ECKey spendPubKey = ECKey.fromPublicOnly(Arrays.copyOfRange(witnessProgram, 33, 66));
+
+        return new SilentPaymentAddress(scanPubKey, spendPubKey);
+    }
+
+    @Override
+    public String toString() {
+        return getAddress();
+    }
+
+    public String toAbbreviatedString() {
+        String address = toString();
+        return address.substring(0, 24) + "..." +  address.substring(address.length() - 24);
+    }
+
+    @Override
+    public final boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(!(o instanceof SilentPaymentAddress that)) {
+            return false;
+        }
+
+        return getAddress().equals(that.getAddress());
+    }
+
+    @Override
+    public int hashCode() {
+        return getAddress().hashCode();
+    }
+
+    public byte[] serialize() {
+        ByteBuffer buffer = ByteBuffer.allocate(67);
+        buffer.put((byte)VERSION);
+        buffer.put(scanAddress.getPubKey());
+        buffer.put(spendAddress.getPubKey());
+        return buffer.array();
+    }
+
+    public static SilentPaymentAddress fromBytes(byte[] bytes) {
+        if(bytes.length != 67) {
+            throw new IllegalArgumentException("Silent payment address must be 67 bytes");
+        }
+        int version = bytes[0] & 0xff;
+        if(version != VERSION) {
+            throw new UnsupportedOperationException("Unsupported silent payments address version " + version);
+        }
+        ECKey scanPubKey = ECKey.fromPublicOnly(Arrays.copyOfRange(bytes, 1, 34));
+        ECKey spendPubKey = ECKey.fromPublicOnly(Arrays.copyOfRange(bytes, 34, 67));
+        return new SilentPaymentAddress(scanPubKey, spendPubKey);
+    }
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentScanAddress.java

@@ -0,0 +1,127 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+import com.sparrowwallet.drongo.KeyDerivation;
+import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.policy.Policy;
+import com.sparrowwallet.drongo.policy.PolicyType;
+import com.sparrowwallet.drongo.protocol.Bech32;
+import com.sparrowwallet.drongo.protocol.ScriptType;
+import com.sparrowwallet.drongo.wallet.*;
+
+import java.util.Arrays;
+
+public class SilentPaymentScanAddress extends SilentPaymentAddress {
+    public static final long CHANGE_LABEL_INDEX = 0L;
+
+    public SilentPaymentScanAddress(ECKey scanPrivateKey, ECKey spendPublicKey) {
+        super(scanPrivateKey, spendPublicKey);
+
+        if(scanPrivateKey.isPubKeyOnly()) {
+            throw new IllegalArgumentException("Scan key must be a private key");
+        }
+    }
+
+    public ECKey getChangeTweakKey() {
+        return SilentPaymentUtils.getLabelledTweakKey(getScanKey(), CHANGE_LABEL_INDEX);
+    }
+
+    public ECKey getLabelledTweakKey(long labelIndex) {
+        return SilentPaymentUtils.getLabelledTweakKey(getScanKey(), labelIndex);
+    }
+
+    public SilentPaymentScanAddress getChangeAddress() {
+        return getLabelledAddress(CHANGE_LABEL_INDEX);
+    }
+
+    public SilentPaymentScanAddress getLabelledAddress(long labelIndex) {
+        ECKey labelledSpendKey = SilentPaymentUtils.getLabelledSpendKey(getScanKey(), getSpendKey(), labelIndex);
+        return new SilentPaymentScanAddress(getScanKey(), labelledSpendKey);
+    }
+
+    public static SilentPaymentScanAddress from(DeterministicSeed deterministicSeed, int account) throws MnemonicException {
+        Wallet spWallet = new Wallet();
+        spWallet.setPolicyType(PolicyType.SINGLE_HD);
+        spWallet.setScriptType(ScriptType.P2WPKH);
+        Keystore spKeystore = Keystore.fromSeed(deterministicSeed, PolicyType.SINGLE_HD, KeyDerivation.getBip352Derivation(account));
+        spWallet.getKeystores().add(spKeystore);
+        spWallet.setDefaultPolicy(Policy.getPolicy(PolicyType.SINGLE_HD, ScriptType.P2WPKH, spWallet.getKeystores(), 1));
+
+        WalletNode spendNode = new WalletNode(spWallet, "m/0'/0");
+        WalletNode scanNode = new WalletNode(spWallet, "m/1'/0");
+
+        return from(spKeystore.getKey(scanNode), ECKey.fromPublicOnly(spKeystore.getKey(spendNode)));
+    }
+
+    public static SilentPaymentScanAddress from(ECKey scanPrivateKey, ECKey spendPublicKey) {
+        return new SilentPaymentScanAddress(scanPrivateKey, spendPublicKey);
+    }
+
+    public SilentPaymentAddress getSilentPaymentAddress() {
+        return new SilentPaymentAddress(ECKey.fromPublicOnly(getScanKey()), getSpendKey());
+    }
+
+    public SilentPaymentScanAddress copy() {
+        return new SilentPaymentScanAddress(getScanKey(), getSpendKey());
+    }
+
+    public String toKeyString() {
+        return Bech32.encode(Network.get().getSilentPaymentsScanKeyHrp(), 0, Bech32.Encoding.BECH32M, toBytes());
+    }
+
+    public byte[] toBytes() {
+        return Utils.concat(getScanKey().getPrivKeyBytes(), getSpendKey().getPubKey(true));
+    }
+
+    public static boolean isValid(String encoded) {
+        try {
+            fromKeyString(encoded);
+        } catch(Exception e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public static SilentPaymentScanAddress fromKeyString(String encoded) {
+        Bech32.Bech32Data data = Bech32.decode(encoded, 1023);
+        if(data.encoding != Bech32.Encoding.BECH32M) {
+            throw new IllegalArgumentException("Invalid silent payment key encoding");
+        }
+
+        int version = data.data[0];
+        if(version != 0) {
+            throw new UnsupportedOperationException("Unsupported silent payment key version: " + version);
+        }
+
+        byte[] payload = Bech32.convertBits(data.data, 1, data.data.length - 1, 5, 8, false);
+
+        String scanHrp = Network.get().getSilentPaymentsScanKeyHrp();
+        String spendHrp = Network.get().getSilentPaymentsSpendKeyHrp();
+        if(data.hrp.equals(scanHrp)) {
+            return fromBytes(payload);
+        } else if(data.hrp.equals(spendHrp)) {
+            if(payload.length != 64) {
+                throw new IllegalArgumentException("Invalid spspend payload length: " + payload.length);
+            }
+            ECKey scanKey = ECKey.fromPrivate(Arrays.copyOfRange(payload, 0, 32));
+            ECKey spendKey = ECKey.fromPublicOnly(ECKey.fromPrivate(Arrays.copyOfRange(payload, 32, 64)).getPubKey());
+
+            return new SilentPaymentScanAddress(scanKey, spendKey);
+        } else {
+            throw new IllegalArgumentException("Invalid silent payment key HRP: " + data.hrp);
+        }
+    }
+
+    public static SilentPaymentScanAddress fromBytes(byte[] bytes) {
+        if(bytes == null || bytes.length != 65) {
+            throw new IllegalArgumentException("Invalid silent payments scan address serialization, must be 65 bytes long");
+        }
+
+        ECKey scanKey = ECKey.fromPrivate(Arrays.copyOfRange(bytes, 0, 32));
+        ECKey spendKey = ECKey.fromPublicOnly(Arrays.copyOfRange(bytes, 32, 65));
+
+        return new SilentPaymentScanAddress(scanKey, spendKey);
+    }
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentScanMatch.java

@@ -0,0 +1,15 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+/**
+ * A single output match produced by {@link SilentPaymentUtils#scanTransactionOutputs}.
+ * <p>
+ * The {@code tweak} is the value to store on {@code WalletNode.silentPaymentTweak}: for an unlabeled
+ * receive output it is {@code t_k}; for a labeled output it is {@code (t_k + label_m_priv) mod n} —
+ * the combined scalar, so {@code Keystore.getKey/getPubKey} can derive the on-chain output key by
+ * adding it directly to the base spend key, with no label awareness in the signing path.
+ *
+ * @param outputIndex the index of the matched output within the transaction
+ * @param labelIndex {@code null} for an unlabeled receive match; {@code 0} for change; positive for labeled receive
+ * @param tweak 32-byte scalar; the value to persist as the WalletNode's silent-payment tweak
+ */
+public record SilentPaymentScanMatch(int outputIndex, Integer labelIndex, byte[] tweak) {}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentUtils.java

@@ -0,0 +1,513 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+import com.sparrowwallet.drongo.Utils;
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.protocol.*;
+import com.sparrowwallet.drongo.wallet.MnemonicException;
+import com.sparrowwallet.drongo.wallet.WalletNode;
+import org.bitcoin.NativeSecp256k1;
+import org.bitcoin.NativeSecp256k1Util;
+import org.bitcoin.Secp256k1Context;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.security.SecureRandom;
+import java.util.*;
+
+import static com.sparrowwallet.drongo.protocol.ScriptType.P2TR;
+
+public class SilentPaymentUtils {
+    private static final Logger log = LoggerFactory.getLogger(SilentPaymentUtils.class);
+
+    private static final List<ScriptType> SCRIPT_TYPES = List.of(ScriptType.P2TR, ScriptType.P2WPKH, ScriptType.P2SH, ScriptType.P2PKH);
+
+    //Alternative generator point on the secp256k1 curve (x-coordinate) generated from the SHA256 hash of "The scalar for this x is unknown"
+    private static final byte[] NUMS_H = {
+            (byte) 0x50, (byte) 0x92, (byte) 0x9b, (byte) 0x74, (byte) 0xc1, (byte) 0xa0, (byte) 0x49, (byte) 0x54, (byte) 0xb7, (byte) 0x8b, (byte) 0x4b, (byte) 0x60,
+            (byte) 0x35, (byte) 0xe9, (byte) 0x7a, (byte) 0x5e, (byte) 0x07, (byte) 0x8a, (byte) 0x5a, (byte) 0x0f, (byte) 0x28, (byte) 0xec, (byte) 0x96, (byte) 0xd5,
+            (byte) 0x47, (byte) 0xbf, (byte) 0xee, (byte) 0x9a, (byte) 0xce, (byte) 0x80, (byte) 0x3a, (byte) 0xc0
+    };
+
+    public static final String BIP_0352_INPUTS_TAG = "BIP0352/Inputs";
+    public static final String BIP_0352_SHARED_SECRET_TAG = "BIP0352/SharedSecret";
+    public static final String BIP_0352_LABEL_TAG = "BIP0352/Label";
+    public static final int K_MAX = 2323;
+
+    public static boolean isEligible(Transaction tx, Map<HashIndex, Script> spentScriptPubKeys) {
+        if(!containsTaprootOutput(tx)) {
+            return false;
+        }
+
+        if(getInputPubKeys(tx, spentScriptPubKeys).isEmpty()) {
+            return false;
+        }
+
+        if(spendsInvalidSegwitOutput(tx, spentScriptPubKeys)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public static Map<TransactionInput, ECKey> getInputPubKeys(Transaction tx, Map<HashIndex, Script> spentScriptPubKeys) {
+        Map<TransactionInput, ECKey> inputKeys = new LinkedHashMap<>();
+        for(TransactionInput input : tx.getInputs()) {
+            HashIndex hashIndex = new HashIndex(input.getOutpoint().getHash(), input.getOutpoint().getIndex());
+            Script scriptPubKey = spentScriptPubKeys.get(hashIndex);
+            if(scriptPubKey == null) {
+                throw new IllegalStateException("No scriptPubKey found for input " + input.getOutpoint().getHash() + ":" + input.getOutpoint().getIndex());
+            }
+            for(ScriptType scriptType : SCRIPT_TYPES) {
+                if(scriptType.isScriptType(scriptPubKey)) {
+                    switch(scriptType) {
+                        case P2TR:
+                            if(input.getWitness() != null && input.getWitness().getPushCount() >= 1) {
+                                List<byte[]> stack = input.getWitness().getPushes();
+                                if(stack.size() > 1 && stack.getLast().length > 0 && stack.getLast()[0] == 0x50) {  //Last item is annex
+                                    stack = stack.subList(0, stack.size() - 1);
+                                }
+
+                                if(stack.size() > 1) {
+                                    // Script path spend
+                                    byte[] controlBlock = stack.getLast();
+                                    // Control block is <control byte> <32 byte internal key> and 0 or more <32 byte hash>
+                                    if(controlBlock.length >= 33) {
+                                        byte[] internalKey = Arrays.copyOfRange(controlBlock, 1, 33);
+                                        if(Arrays.equals(internalKey, NUMS_H)) {
+                                            break;
+                                        }
+                                    }
+                                }
+
+                                ECKey pubKey = ScriptType.P2TR.getPublicKeyFromScript(scriptPubKey);
+                                if(pubKey.isCompressed()) {
+                                    inputKeys.put(input, pubKey);
+                                }
+                            }
+                            break;
+                        case P2SH:
+                            Script redeemScript = input.getScriptSig().getFirstNestedScript();
+                            if(redeemScript != null && ScriptType.P2WPKH.isScriptType(redeemScript)) {
+                                if(input.getWitness() != null && input.getWitness().getPushCount() == 2) {
+                                    byte[] pubKey = input.getWitness().getPushes().getLast();
+                                    if(pubKey != null && pubKey.length == 33) {
+                                        inputKeys.put(input, ECKey.fromPublicOnly(pubKey));
+                                    }
+                                }
+                            }
+                            break;
+                        case P2WPKH:
+                            if(input.getWitness() != null && input.getWitness().getPushCount() == 2) {
+                                byte[] pubKey = input.getWitness().getPushes().getLast();
+                                if(pubKey != null && pubKey.length == 33) {
+                                    inputKeys.put(input, ECKey.fromPublicOnly(pubKey));
+                                }
+                            }
+                            break;
+                        case P2PKH:
+                            byte[] spkHash = ScriptType.P2PKH.getHashFromScript(scriptPubKey);
+                            for(ScriptChunk scriptChunk : input.getScriptSig().getChunks()) {
+                                if(scriptChunk.isPubKey() && scriptChunk.getData().length == 33 && Arrays.equals(Utils.sha256hash160(scriptChunk.getData()), spkHash)) {
+                                    inputKeys.put(input, scriptChunk.getPubKey());
+                                    break;
+                                }
+                            }
+                            break;
+                        default:
+                            throw new IllegalStateException("Unhandled script type " + scriptType);
+                    }
+                }
+            }
+        }
+
+        return inputKeys;
+    }
+
+    public static boolean containsTaprootOutput(Transaction tx) {
+        for(TransactionOutput output : tx.getOutputs()) {
+            if(ScriptType.P2TR.isScriptType(output.getScript())) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static boolean spendsInvalidSegwitOutput(Transaction tx, Map<HashIndex, Script> spentScriptPubKeys) {
+        for(TransactionInput input : tx.getInputs()) {
+            HashIndex hashIndex = new HashIndex(input.getOutpoint().getHash(), input.getOutpoint().getIndex());
+            Script scriptPubKey = spentScriptPubKeys.get(hashIndex);
+            if(scriptPubKey == null) {
+                throw new IllegalStateException("No scriptPubKey found for input " + input.getOutpoint().getHash() + ":" + input.getOutpoint().getIndex());
+            }
+            List<ScriptChunk> chunks = scriptPubKey.getChunks();
+            if(chunks.size() == 2 && chunks.getFirst().isOpCode() && chunks.get(1).getData() != null
+                    && chunks.getFirst().getOpcode() >= ScriptOpCodes.OP_2 && chunks.getFirst().getOpcode() <= ScriptOpCodes.OP_16) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static byte[] getTweak(Transaction tx, Map<HashIndex, Script> spentScriptPubKeys) {
+        return getTweak(tx, spentScriptPubKeys, true);
+    }
+
+    public static byte[] getTweak(Transaction tx, Map<HashIndex, Script> spentScriptPubKeys, boolean compressed) {
+        if(tx.getOutputs().stream().noneMatch(output -> ScriptType.P2TR.isScriptType(output.getScript()))) {
+            return null;
+        }
+
+        if(spendsInvalidSegwitOutput(tx, spentScriptPubKeys)) {
+            return null;
+        }
+
+        Map<TransactionInput, ECKey> inputKeys = getInputPubKeys(tx, spentScriptPubKeys);
+        if(inputKeys.isEmpty()) {
+            return null;
+        }
+
+        if(!Secp256k1Context.isEnabled()) {
+            throw new IllegalStateException("libsecp256k1 is not enabled");
+        }
+
+        try {
+            byte[][] inputPubKeys = new byte[inputKeys.size()][];
+            int index = 0;
+            for (ECKey key : inputKeys.values()) {
+                inputPubKeys[index++] = key.getPubKey(true);
+            }
+            byte[] combinedPubKey = NativeSecp256k1.pubKeyCombine(inputPubKeys, true);
+            byte[] smallestOutpoint = tx.getInputs().stream().map(input -> input.getOutpoint().bitcoinSerialize()).min(new Utils.LexicographicByteArrayComparator()).orElseThrow();
+
+            byte[] inputHash = Utils.taggedHash(BIP_0352_INPUTS_TAG, Utils.concat(smallestOutpoint, combinedPubKey));
+            return NativeSecp256k1.pubKeyTweakMul(combinedPubKey, inputHash, compressed);
+        } catch(NativeSecp256k1Util.AssertFailException e) {
+            log.error("Error computing tweak", e);
+        }
+
+        return null;
+    }
+
+    /**
+     * Computes the output addresses for a list of silent payments by calculating the shared secret
+     * between scan keys, spend keys, and the summed private key derived from the provided UTXOs.
+     * Updates each silent payment instance with the corresponding address.
+     *
+     * @param silentPayments the list of silent payments containing silent payment addresses and metadata
+     * @param utxos a map of UTXOs (unspent transaction outputs) to wallet nodes, containing information
+     *              about inputs used to derive the summed private key
+     * @throws InvalidSilentPaymentException if the computed shared secrets or addresses are invalid
+     */
+    public static Map<ECKey, EcdhShareAndProof> computeOutputAddresses(List<SilentPayment> silentPayments, Map<HashIndex, WalletNode> utxos) throws InvalidSilentPaymentException {
+        ECKey summedPrivateKey = getSummedPrivateKey(utxos.values());
+        return computeOutputAddresses(silentPayments, summedPrivateKey, utxos.keySet());
+    }
+
+    public static Map<ECKey, EcdhShareAndProof> computeOutputAddresses(List<SilentPayment> silentPayments, ECKey summedPrivateKey, Set<HashIndex> outpoints) throws InvalidSilentPaymentException {
+        Map<ECKey, EcdhShareAndProof> scanKeyProofs = new LinkedHashMap<>();
+        SecureRandom random = new SecureRandom();
+        BigInteger inputHash = getInputHash(outpoints, summedPrivateKey);
+        Map<ECKey, List<SilentPayment>> scanKeyGroups = getScanKeyGroups(silentPayments);
+        for(Map.Entry<ECKey, List<SilentPayment>> scanKeyGroup : scanKeyGroups.entrySet()) {
+            ECKey scanKey = scanKeyGroup.getKey();
+            ECKey ecdhShare = scanKey.multiply(summedPrivateKey.getPrivKey(), true);
+            SilentPaymentsDLEQProof dleqProof = SilentPaymentsDLEQProof.generate(summedPrivateKey.getPrivKey(), scanKey, random);
+            scanKeyProofs.put(scanKey, new EcdhShareAndProof(ecdhShare, dleqProof));
+            ECKey sharedSecret = ecdhShare.multiply(inputHash, true);
+            int k = 0;
+            for(SilentPayment silentPayment : scanKeyGroup.getValue()) {
+                BigInteger tk = new BigInteger(1, Utils.taggedHash(BIP_0352_SHARED_SECRET_TAG,
+                        Utils.concat(sharedSecret.getPubKey(true), ByteBuffer.allocate(4).order(ByteOrder.BIG_ENDIAN).putInt(k).array())));
+                if(tk.equals(BigInteger.ZERO) || tk.compareTo(ECKey.CURVE.getN()) >= 0) {
+                    throw new InvalidSilentPaymentException("The tk value is invalid for the eligible silent payments inputs");
+                }
+                ECKey spendKey = silentPayment.getSilentPaymentAddress().getSpendKey();
+                ECKey pkm = spendKey.add(ECKey.fromPublicOnly(ECKey.publicPointFromPrivate(tk).getEncoded(true)), true);
+                silentPayment.setAddress(P2TR.getAddress(pkm.getPubKeyXCoord()));
+                k++;
+            }
+        }
+
+        return scanKeyProofs;
+    }
+
+    /**
+     * Validates that the output scripts for silent payment outputs match the expected scripts
+     * computed from the ECDH shares. This implements BIP-375 output script verification.
+     *
+     * @param silentPayments  List of silent payments sending to a common scan key
+     * @param ecdhShare       The ECDH share (a * B_scan), either global or summed from per-input
+     * @param summedPublicKey The sum of all eligible input public keys
+     * @param outpoints       Set of outpoints for eligible inputs
+     * @throws InvalidSilentPaymentException if validation fails or scripts don't match
+     */
+    public static void validateOutputAddresses(List<SilentPayment> silentPayments, ECKey ecdhShare, ECKey summedPublicKey, Set<HashIndex> outpoints) throws InvalidSilentPaymentException {
+        BigInteger inputHash = getInputHash(outpoints, summedPublicKey);
+        Map<ECKey, List<SilentPayment>> scanKeyGroups = getScanKeyGroups(silentPayments);
+        for(Map.Entry<ECKey, List<SilentPayment>> scanKeyGroup : scanKeyGroups.entrySet()) {
+            // Compute shared secret from ECDH share and input hash
+            // Instead of: sharedSecret = scanKey.multiply(inputHash).multiply(summedPrivateKey.getPrivKey())
+            // We use: sharedSecret = ecdhShare.multiply(inputHash)
+            // Because ecdhShare is already (a * B_scan)
+            ECKey sharedSecret = ecdhShare.multiply(inputHash, true);
+
+            int k = 0;
+            for(SilentPayment silentPayment : scanKeyGroup.getValue()) {
+                BigInteger tk = new BigInteger(1, Utils.taggedHash(BIP_0352_SHARED_SECRET_TAG,
+                        Utils.concat(sharedSecret.getPubKey(true), ByteBuffer.allocate(4).order(ByteOrder.BIG_ENDIAN).putInt(k).array())));
+                if(tk.equals(BigInteger.ZERO) || tk.compareTo(ECKey.CURVE.getN()) >= 0) {
+                    throw new InvalidSilentPaymentException("The tk value is invalid for the eligible silent payments inputs");
+                }
+                ECKey spendKey = silentPayment.getSilentPaymentAddress().getSpendKey();
+                ECKey pkm = spendKey.add(ECKey.fromPublicOnly(ECKey.publicPointFromPrivate(tk).getEncoded(true)), true);
+                Address expectedAddress = ScriptType.P2TR.getAddress(pkm.getPubKeyXCoord());
+                if(!silentPayment.getAddress().equals(expectedAddress)) {
+                    throw new InvalidSilentPaymentException("Silent payment output address mismatch: expected " + expectedAddress + " but got " + silentPayment.getAddress());
+                }
+                k++;
+            }
+        }
+    }
+
+    public static Map<ECKey, List<SilentPayment>> getScanKeyGroups(Collection<SilentPayment> silentPayments) {
+        Map<ECKey, List<SilentPayment>> scanKeyGroups = new LinkedHashMap<>();
+        for(SilentPayment silentPayment : silentPayments) {
+            SilentPaymentAddress address = silentPayment.getSilentPaymentAddress();
+            List<SilentPayment> scanKeyGroup = scanKeyGroups.computeIfAbsent(address.getScanKey(), _ -> new ArrayList<>());
+            scanKeyGroup.add(silentPayment);
+        }
+
+        return scanKeyGroups;
+    }
+
+    public static BigInteger getInputHash(Set<HashIndex> outpoints, ECKey summedInputKey) throws InvalidSilentPaymentException {
+        byte[] smallestOutpoint = getSmallestOutpoint(outpoints);
+        byte[] concat = Utils.concat(smallestOutpoint, summedInputKey.getPubKey(true));
+        BigInteger inputHash = new BigInteger(1, Utils.taggedHash(BIP_0352_INPUTS_TAG, concat));
+        if(inputHash.equals(BigInteger.ZERO) || inputHash.compareTo(ECKey.CURVE.getN()) >= 0) {
+            throw new InvalidSilentPaymentException("The input hash is invalid for the eligible silent payments inputs");
+        }
+
+        return inputHash;
+    }
+
+    public static ECKey getSummedPrivateKey(Collection<WalletNode> walletNodes) throws InvalidSilentPaymentException {
+        BigInteger summedPrivKey = null;
+        for(WalletNode walletNode : walletNodes) {
+            if(!walletNode.getWallet().canSendSilentPayments()) {
+                continue;
+            }
+
+            try {
+                ECKey rawKey = walletNode.getWallet().getKeystores().getFirst().getKey(walletNode);
+                ECKey privateKey = walletNode.getWallet().getScriptType().getOutputKey(walletNode.getWallet().getPolicyType(), rawKey);
+                if(walletNode.getWallet().getScriptType() == P2TR && privateKey.hasOddYCoord()) {
+                    privateKey = privateKey.negatePrivate();
+                }
+                if(summedPrivKey == null) {
+                    summedPrivKey = privateKey.getPrivKey();
+                } else {
+                    summedPrivKey = summedPrivKey.add(privateKey.getPrivKey()).mod(ECKey.CURVE.getN());
+                }
+            } catch(MnemonicException e) {
+                throw new InvalidSilentPaymentException("Invalid wallet mnemonic for sending silent payment", e);
+            }
+        }
+
+        if(summedPrivKey == null) {
+            throw new InvalidSilentPaymentException("There are no eligible inputs to derive a silent payments shared secret");
+        }
+
+        if(summedPrivKey.equals(BigInteger.ZERO)) {
+            throw new InvalidSilentPaymentException("The summed private key is zero for the eligible silent payments inputs");
+        }
+
+        return ECKey.fromPrivate(summedPrivKey);
+    }
+
+    public static ECKey getInputPublicKey(WalletNode walletNode) {
+        if(!walletNode.getWallet().canSendSilentPayments()) {
+            return null;
+        }
+
+        ECKey rawKey = walletNode.getPubKey();
+        ECKey publicKey = walletNode.getWallet().getScriptType().getOutputKey(walletNode.getWallet().getPolicyType(), rawKey);
+        if(walletNode.getWallet().getScriptType() == P2TR && publicKey.hasOddYCoord()) {
+            publicKey = publicKey.negate();
+        }
+
+        return publicKey;
+    }
+
+    public static ECKey getSummedPublicKey(Collection<ECKey> publicKeys) {
+        ECKey summedKey = null;
+
+        for(ECKey publicKey : publicKeys) {
+            if(publicKey != null) {
+                if(summedKey == null) {
+                    summedKey = publicKey;
+                } else {
+                    summedKey = summedKey.add(publicKey, true);
+                }
+            }
+        }
+
+        return summedKey;
+    }
+
+    public static byte[] getSmallestOutpoint(Set<HashIndex> outpoints) {
+        return outpoints.stream().map(outpoint -> new TransactionOutPoint(outpoint.getHash(), outpoint.getIndex())).map(TransactionOutPoint::bitcoinSerialize)
+                .min(new Utils.LexicographicByteArrayComparator()).orElseThrow(() -> new IllegalArgumentException("No inputs provided to calculate silent payments input hash"));
+    }
+
+    public static ECKey getLabelledSpendKey(ECKey scanPrivateKey, ECKey spendPublicKey, long labelIndex) {
+        return spendPublicKey.add(getLabelledTweakKey(scanPrivateKey, labelIndex), true);
+    }
+
+    public static ECKey getLabelledTweakKey(ECKey scanPrivateKey, long labelIndex) {
+        return ECKey.fromPublicOnly(ECKey.publicPointFromPrivate(getLabelledTweakScalar(scanPrivateKey, labelIndex)).getEncoded(true));
+    }
+
+    public static BigInteger getLabelledTweakScalar(ECKey scanPrivateKey, long labelIndex) {
+        return new BigInteger(1, Utils.taggedHash(BIP_0352_LABEL_TAG, Utils.concat(scanPrivateKey.getPrivKeyBytes(), ByteBuffer.allocate(4).order(ByteOrder.BIG_ENDIAN).putInt((int)labelIndex).array())));
+    }
+
+    /**
+     * Scans the outputs of a transaction for silent-payment outputs paying to the receiver identified by
+     * {@code scanPrivateKey} and {@code spendPublicKey}, given the per-transaction {@code tweakKey}
+     * (= input_hash * A_sum) supplied by the indexer.
+     * <p>
+     * Implements the BIP352 receive-side algorithm: ECDH against the tweak key, k-iteration with
+     * tagged-hash derivation, unlabeled-then-labeled match per output, terminating when no output
+     * matches at the current k. Both label 0 (change) and any caller-supplied positive labels are
+     * scanned for.
+     * <p>
+     * For labeled matches the returned {@code tweak} is the combined scalar
+     * {@code (t_k + label_m_priv) mod n}, ready for direct storage on a {@code WalletNode}.
+     *
+     * @param scanPrivateKey the receiver's scan private key (b_scan)
+     * @param spendPublicKey the receiver's spend public key (B_spend), 33-byte compressed
+     * @param labelIndices additional positive label indices to scan for; m=0 (change) is always included
+     * @param tweakKey the 33-byte compressed pubkey input_hash * A_sum from the indexer
+     * @param outputs the full list of outputs in the transaction (non-P2TR outputs are ignored)
+     * @return matches in ascending outputIndex order, or empty if none (including server false positives)
+     * @throws IllegalArgumentException if any required input is null or {@code tweakKey} is malformed
+     * @throws InvalidSilentPaymentException if a derived {@code t_k} scalar is invalid (zero or {@code >= n}), per BIP352
+     */
+    public static List<SilentPaymentScanMatch> scanTransactionOutputs(ECKey scanPrivateKey, ECKey spendPublicKey, Set<Integer> labelIndices, byte[] tweakKey, List<TransactionOutput> outputs) throws InvalidSilentPaymentException {
+        if(scanPrivateKey == null || spendPublicKey == null || labelIndices == null || tweakKey == null || outputs == null) {
+            throw new IllegalArgumentException("All arguments must be non-null");
+        }
+        if(tweakKey.length != 33) {
+            throw new IllegalArgumentException("tweakKey must be 33 bytes (compressed pubkey)");
+        }
+
+        ECKey tweakKeyPoint;
+        try {
+            tweakKeyPoint = ECKey.fromPublicOnly(tweakKey);
+        } catch(Exception e) {
+            throw new IllegalArgumentException("tweakKey is not a valid compressed pubkey", e);
+        }
+
+        // shared_secret = scan_priv * tweak_key (point multiplication)
+        ECKey sharedSecret = tweakKeyPoint.multiply(scanPrivateKey.getPrivKey(), true);
+        byte[] sharedSecretCompressed = sharedSecret.getPubKey(true);
+
+        // Precompute label keys for {0} ∪ labelIndices.
+        Set<Integer> allLabels = new TreeSet<>(labelIndices);
+        allLabels.add(0);
+        List<LabelEntry> labelEntries = new ArrayList<>();
+        for(int m : allLabels) {
+            labelEntries.add(new LabelEntry(m, ECKey.fromPrivate(getLabelledTweakScalar(scanPrivateKey, m))));
+        }
+
+        // Filter to P2TR outputs, keeping their original indices and x-only pubkeys.
+        List<ScanMatchCandidate> remaining = new ArrayList<>();
+        for(int i = 0; i < outputs.size(); i++) {
+            Script script = outputs.get(i).getScript();
+            if(P2TR.isScriptType(script)) {
+                byte[] xOnly = P2TR.getPublicKeyFromScript(script).getPubKeyXCoord();
+                remaining.add(new ScanMatchCandidate(i, xOnly));
+            }
+        }
+
+        List<SilentPaymentScanMatch> matches = new ArrayList<>();
+        int k = 0;
+
+        // BIP352 termination: stop when an entire pass over the remaining outputs at a given k
+        // produces no match. k advances only on a match.
+        while(!remaining.isEmpty() && k < K_MAX) {
+            byte[] tkBytes = Utils.taggedHash(BIP_0352_SHARED_SECRET_TAG, Utils.concat(sharedSecretCompressed, ByteBuffer.allocate(4).order(ByteOrder.BIG_ENDIAN).putInt(k).array()));
+            BigInteger tk = new BigInteger(1, tkBytes);
+            if(tk.equals(BigInteger.ZERO) || tk.compareTo(ECKey.CURVE.getN()) >= 0) {
+                throw new InvalidSilentPaymentException("The tk value is invalid for the eligible silent payments inputs");
+            }
+
+            ECKey tkPoint = ECKey.fromPrivate(tk);              // tkPoint.pub == t_k * G
+            ECKey pK = spendPublicKey.add(tkPoint, true);       // P_k = B_spend + t_k * G
+
+            int matchedIndex = -1;
+            Integer matchedLabel = null;
+            byte[] matchedTweak = null;
+
+            for(ScanMatchCandidate candidate : remaining) {
+                // Unlabeled: x_only(P_k) == output x-only?
+                if(Arrays.equals(pK.getPubKeyXCoord(), candidate.xOnly())) {
+                    matchedIndex = candidate.index();
+                    matchedLabel = null;
+                    matchedTweak = Utils.bigIntegerToBytes(tk, 32);
+                    break;
+                }
+                // Labeled: x_only(P_k + label_m * G) == output x-only?
+                for(LabelEntry label : labelEntries) {
+                    ECKey pkLabeled = pK.add(label.key(), true);
+                    if(Arrays.equals(pkLabeled.getPubKeyXCoord(), candidate.xOnly())) {
+                        matchedIndex = candidate.index();
+                        matchedLabel = label.index();
+                        BigInteger combined = tk.add(label.key().getPrivKey()).mod(ECKey.CURVE.getN());
+                        matchedTweak = Utils.bigIntegerToBytes(combined, 32);
+                        break;
+                    }
+                }
+                if(matchedIndex >= 0) {
+                    break;
+                }
+            }
+
+            if(matchedIndex < 0) {
+                break;
+            }
+
+            matches.add(new SilentPaymentScanMatch(matchedIndex, matchedLabel, matchedTweak));
+            int finalMatchedIndex = matchedIndex;
+            remaining.removeIf(c -> c.index() == finalMatchedIndex);
+            k++;
+        }
+
+        matches.sort(Comparator.comparingInt(SilentPaymentScanMatch::outputIndex));
+        return matches;
+    }
+
+    public static byte[] getSecp256k1PubKey(ECKey ecKey) {
+        return getSecp256k1PubKey(ecKey.getPubKey(false));
+    }
+
+    public static byte[] getSecp256k1PubKey(byte[] uncompressedKey) {
+        byte[] key = new byte[64];
+        System.arraycopy(uncompressedKey, 1, key, 32, 32);
+        System.arraycopy(uncompressedKey, 33, key, 0, 32);
+        return Utils.reverseBytes(key);
+    }
+
+    public record EcdhShareAndProof(ECKey ecdhShare, SilentPaymentsDLEQProof dleqProof) {}
+
+    private record LabelEntry(int index, ECKey key) {}
+
+    private record ScanMatchCandidate(int index, byte[] xOnly) {}
+}

src/main/java/com/sparrowwallet/drongo/silentpayments/SilentPaymentsDLEQProof.java

@@ -0,0 +1,150 @@
+package com.sparrowwallet.drongo.silentpayments;
+
+import com.sparrowwallet.drongo.crypto.DLEQProof;
+import com.sparrowwallet.drongo.crypto.ECKey;
+
+import java.math.BigInteger;
+import java.security.SecureRandom;
+import java.util.Arrays;
+
+/**
+ * Represents a BIP-375 Silent Payments DLEQ proof.
+ *
+ * This class wraps a 64-byte DLEQ proof that proves the discrete logarithm
+ * equivalency between a public key and an ECDH share, as used in BIP-375
+ * Silent Payments for PSBTs.
+ */
+public class SilentPaymentsDLEQProof {
+    private final byte[] proof;
+
+    /**
+     * Private constructor that validates and stores the proof bytes.
+     *
+     * @param proofBytes The 64-byte DLEQ proof
+     * @throws IllegalArgumentException if proof is not exactly 64 bytes
+     */
+    private SilentPaymentsDLEQProof(byte[] proofBytes) {
+        if(proofBytes == null) {
+            throw new IllegalArgumentException("DLEQ proof cannot be null");
+        }
+        if(proofBytes.length != 64) {
+            throw new IllegalArgumentException("DLEQ proof must be exactly 64 bytes, got " + proofBytes.length);
+        }
+        this.proof = Arrays.copyOf(proofBytes, proofBytes.length);
+    }
+
+    public static SilentPaymentsDLEQProof generate(BigInteger privateKey, ECKey scanKey, SecureRandom random) throws InvalidSilentPaymentException {
+        byte[] auxRand = new byte[32];
+        random.nextBytes(auxRand);
+        return generate(privateKey, scanKey, auxRand);
+    }
+
+    /**
+     * Generate a DLEQ proof for Silent Payments according to BIP-375.
+     *
+     * This method generates a proof that the ECDH share (a⋅B_scan) and the public key (a⋅G)
+     * were both generated from the same private key a without revealing a.
+     *
+     * @param privateKey The private key (a) - either a single input's private key or the sum of the private keys for all eligible inputs
+     * @param scanKey The scan public key (B_scan) from the silent payment address
+     * @param auxRand 32 bytes of auxiliary random data (should be fresh randomness for each proof)
+     * @return A new SilentPaymentsDLEQProof instance
+     * @throws IllegalArgumentException if scanKey is not a public-only key, or if auxRand is not 32 bytes
+     * @throws InvalidSilentPaymentException if proof generation fails
+     */
+    public static SilentPaymentsDLEQProof generate(BigInteger privateKey, ECKey scanKey, byte[] auxRand) throws InvalidSilentPaymentException {
+        if(auxRand == null || auxRand.length != 32) {
+            throw new IllegalArgumentException("Auxiliary random data must be exactly 32 bytes");
+        }
+
+        if(!scanKey.isPubKeyOnly()) {
+            throw new IllegalArgumentException("Scan key must be a public key only");
+        }
+
+        // Generate the proof using BIP-374 GenerateProof with:
+        // - a: the private key
+        // - B: the scan key
+        // - r: auxiliary random data
+        // - G: null (uses default secp256k1 generator)
+        // - m: null (no message for BIP-375)
+        byte[] proofBytes = DLEQProof.generateProof(privateKey, scanKey, auxRand, null, null);
+
+        if(proofBytes == null) {
+            throw new InvalidSilentPaymentException("Failed to generate DLEQ proof");
+        }
+
+        return new SilentPaymentsDLEQProof(proofBytes);
+    }
+
+    /**
+     * Create a SilentPaymentsDLEQProof from existing proof bytes.
+     *
+     * @param proofBytes The 64-byte DLEQ proof
+     * @return A new SilentPaymentsDLEQProof instance
+     * @throws IllegalArgumentException if proof is not exactly 64 bytes
+     */
+    public static SilentPaymentsDLEQProof fromBytes(byte[] proofBytes) {
+        return new SilentPaymentsDLEQProof(proofBytes);
+    }
+
+    /**
+     * Verify this DLEQ proof according to BIP-375.
+     *
+     * This verifies that the ECDH share was generated from the same private key
+     * as the public key, without revealing the private key.
+     *
+     * @param publicKey The public key of the input, or the sum of the public keys of all eligible inputs (A = a⋅G)
+     * @param scanKey The scan public key (B_scan) from the silent payment address
+     * @param ecdhShare The ECDH share for the input, or the ECDH share for all inputs (C = a⋅B_scan)
+     * @return true if the proof is valid, false otherwise
+     * @throws IllegalArgumentException if any key is not a public-only key
+     */
+    public boolean verify(ECKey publicKey, ECKey scanKey, ECKey ecdhShare) {
+        if(!publicKey.isPubKeyOnly() || !scanKey.isPubKeyOnly() || !ecdhShare.isPubKeyOnly()) {
+            throw new IllegalArgumentException("All keys for verification must be public keys only");
+        }
+
+        // Verify the proof using BIP-374 VerifyProof with:
+        // - A: the public key
+        // - B: the scan key
+        // - C: the ECDH share
+        // - proof: this proof
+        // - G: null (uses default secp256k1 generator)
+        // - m: null (no message for BIP-375)
+        return DLEQProof.verifyProof(publicKey, scanKey, ecdhShare, proof, null, null);
+    }
+
+    /**
+     * Get the raw 64-byte proof.
+     *
+     * @return A copy of the proof bytes
+     */
+    public byte[] getBytes() {
+        return Arrays.copyOf(proof, proof.length);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(!(o instanceof SilentPaymentsDLEQProof that)) {
+            return false;
+        }
+        return Arrays.equals(proof, that.proof);
+    }
+
+    @Override
+    public int hashCode() {
+        return Arrays.hashCode(proof);
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        for(byte b : proof) {
+            sb.append(String.format("%02x", b));
+        }
+        return sb.toString();
+    }
+}

src/main/java/com/sparrowwallet/drongo/uri/BitcoinURI.java

@@ -1,7 +1,11 @@
 package com.sparrowwallet.drongo.uri;
 
+import com.sparrowwallet.drongo.Network;
+import com.sparrowwallet.drongo.Utils;
 import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.address.InvalidAddressException;
+import com.sparrowwallet.drongo.silentpayments.SilentPayment;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentAddress;
 import com.sparrowwallet.drongo.wallet.Payment;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -66,6 +70,7 @@ public class BitcoinURI {
     public static final String FIELD_PAYMENT_REQUEST_URL = "r";
     public static final String FIELD_PAYJOIN_URL = "pj";
     public static final String FIELD_PAYJOIN_OUTPUT_SUBSTITUTION = "pjos";
+    public static final String FIELD_SILENT_PAYMENTS_ADDRESS = Network.get().getSilentPaymentsAddressHrp();
 
     public static final String BITCOIN_SCHEME = "bitcoin";
     private static final String ENCODED_SPACE_CHARACTER = "%20";
@@ -75,6 +80,8 @@ public class BitcoinURI {
     public static final DecimalFormat BTC_FORMAT = new DecimalFormat("0", DecimalFormatSymbols.getInstance(Locale.ENGLISH));
     public static final int SMALLEST_UNIT_EXPONENT = 8;
 
+    private final String uriString;
+
     /**
      * Contains all the parameters in the order in which they were processed
      */
@@ -135,9 +142,7 @@ public class BitcoinURI {
             }
         }
 
-        if(addressToken.isEmpty() && getPaymentRequestUrl() == null) {
-            throw new BitcoinURIParseException("No address and no r= parameter found");
-        }
+        this.uriString = input;
     }
 
     /**
@@ -271,10 +276,10 @@ public class BitcoinURI {
         if(payjoinUrl != null) {
             try {
                 URI uri = new URI(payjoinUrl);
-                if(uri.getScheme().equals("https") || uri.getHost().endsWith(".onion")) {
+                if(Utils.isSecureUrl(uri)) {
                     return uri;
                 } else {
-                    log.error("Insecure payjoin URL provided, must be https or .onion: " + payjoinUrl);
+                    log.error("Insecure payjoin URL provided, must be https or http .onion: " + payjoinUrl);
                 }
             } catch(URISyntaxException e) {
                 log.error("Invalid payjoin URL provided", e);
@@ -291,6 +296,22 @@ public class BitcoinURI {
         return !"0".equals(parameterMap.get(FIELD_PAYJOIN_OUTPUT_SUBSTITUTION));
     }
 
+    /**
+     * @return The silent payments address in the URI, if provided
+     */
+    public final SilentPaymentAddress getSilentPaymentAddress() {
+        String address = (String)parameterMap.get(FIELD_SILENT_PAYMENTS_ADDRESS);
+        if(address != null) {
+            try {
+                return SilentPaymentAddress.from(address);
+            } catch(Exception e) {
+                log.error("Invalid silent payments address provided", e);
+            }
+        }
+
+        return null;
+    }
+
     /**
      * @param name The name of the parameter
      * @return The parameter value, or null if not present
@@ -315,8 +336,16 @@ public class BitcoinURI {
         return builder.toString();
     }
 
+    public String toURIString() {
+        return uriString;
+    }
+
     public Payment toPayment() {
         long amount = getAmount() == null ? -1 : getAmount();
+        SilentPaymentAddress silentPaymentAddress = getSilentPaymentAddress();
+        if(getAddress() == null && silentPaymentAddress != null) {
+            return new SilentPayment(silentPaymentAddress, getLabel(), amount, false);
+        }
         return new Payment(getAddress(), getLabel(), amount, false);
     }
 

src/main/java/com/sparrowwallet/drongo/wallet/FinalizingPSBTWallet.java

@@ -10,8 +10,6 @@ import com.sparrowwallet.drongo.psbt.PSBT;
 import com.sparrowwallet.drongo.psbt.PSBTInput;
 
 import java.util.*;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
 
 /**
  * This is a special wallet that is used solely to finalize a fully signed PSBT by reading from the partial signatures and UTXO scriptPubKey
@@ -67,7 +65,7 @@ public class FinalizingPSBTWallet extends Wallet {
         setGapLimit(0);
         purposeNode.setChildren(new TreeSet<>());
 
-        setPolicyType(numSignatures == 1 ? PolicyType.SINGLE : PolicyType.MULTI);
+        setPolicyType(numSignatures == 1 ? PolicyType.SINGLE_HD : PolicyType.MULTI_HD);
     }
 
     @Override
@@ -100,6 +98,11 @@ public class FinalizingPSBTWallet extends Wallet {
         return signedInputNodes;
     }
 
+    @Override
+    public Map<PSBTInput, WalletNode> getSigningNodes(PSBT psbt, boolean useDerivationFallback) {
+        return signedInputNodes;
+    }
+
     @Override
     public ECKey getPubKey(WalletNode node) {
         return signedNodeKeys.get(node).get(0);

src/main/java/com/sparrowwallet/drongo/wallet/Keystore.java

@@ -9,12 +9,11 @@ import com.sparrowwallet.drongo.bip47.PaymentCode;
 import com.sparrowwallet.drongo.crypto.*;
 import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.ScriptType;
+import com.sparrowwallet.drongo.silentpayments.SilentPaymentScanAddress;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
+import java.util.*;
 
 public class Keystore extends Persistable {
     private static final Logger log = LoggerFactory.getLogger(Keystore.class);
@@ -28,6 +27,8 @@ public class Keystore extends Persistable {
     private KeyDerivation keyDerivation;
     private ExtendedKey extendedPublicKey;
     private PaymentCode externalPaymentCode;
+    private SilentPaymentScanAddress silentPaymentScanAddress;
+    private byte[] deviceRegistration;
     private MasterPrivateExtendedKey masterPrivateExtendedKey;
     private DeterministicSeed seed;
 
@@ -36,6 +37,7 @@ public class Keystore extends Persistable {
 
     //Avoid performing repeated expensive seed derivation checks
     private transient boolean extendedPublicKeyChecked;
+    private transient boolean silentPaymentScanAddressChecked;
 
     public Keystore() {
         this(DEFAULT_LABEL);
@@ -50,6 +52,9 @@ public class Keystore extends Persistable {
     }
 
     public String getBaseLabel() {
+        if(walletModel != null && label.startsWith(walletModel.toDisplayString()) && label.substring(walletModel.toDisplayString().length()).matches("( \\d*)?$")) {
+            return walletModel.toDisplayString();
+        }
         return label.replaceAll(" \\d*$", "");
     }
 
@@ -102,6 +107,23 @@ public class Keystore extends Persistable {
         this.externalPaymentCode = paymentCode;
     }
 
+    public SilentPaymentScanAddress getSilentPaymentScanAddress() {
+        return silentPaymentScanAddress;
+    }
+
+    public void setSilentPaymentScanAddress(SilentPaymentScanAddress silentPaymentScanAddress) {
+        this.silentPaymentScanAddress = silentPaymentScanAddress;
+        this.silentPaymentScanAddressChecked = false;
+    }
+
+    public byte[] getDeviceRegistration() {
+        return deviceRegistration;
+    }
+
+    public void setDeviceRegistration(byte[] deviceRegistration) {
+        this.deviceRegistration = deviceRegistration;
+    }
+
     public boolean hasMasterPrivateExtendedKey() {
         return masterPrivateExtendedKey != null;
     }
@@ -191,14 +213,34 @@ public class Keystore extends Persistable {
     }
 
     public ExtendedKey getExtendedPrivateKey() throws MnemonicException {
+        return getExtendedPrivateKey(true);
+    }
+
+    public ExtendedKey getExtendedPrivateKey(boolean resetPathToDerivedDepth) throws MnemonicException {
         List<ChildNumber> derivation = getKeyDerivation().getDerivation();
         DeterministicKey derivedKey = getExtendedMasterPrivateKey().getKey(derivation);
         ExtendedKey xprv = new ExtendedKey(derivedKey, derivedKey.getParentFingerprint(), derivation.isEmpty() ? ChildNumber.ZERO : derivation.get(derivation.size() - 1));
-        //Recreate from xprv string to reset path to single ChildNumber at the derived depth
-        return ExtendedKey.fromDescriptor(xprv.toString());
+        if(resetPathToDerivedDepth) {
+            //Recreate from xprv string to reset path to single ChildNumber at the derived depth
+            return ExtendedKey.fromDescriptor(xprv.toString());
+        } else {
+            return xprv;
+        }
     }
 
     public ECKey getKey(WalletNode walletNode) throws MnemonicException {
+        if(silentPaymentScanAddress != null && walletNode.getWallet().getPolicyType() == PolicyType.SINGLE_SP) {
+            ECKey spendPrivKey = getSpendPrivateKey(Collections.emptyMap());
+            byte[] tweak = walletNode.getSilentPaymentTweak();
+            if(tweak == null) {
+                if(walletNode.isPurposeNode()) {
+                    return spendPrivKey;
+                }
+                throw new IllegalStateException("Silent payment tweak is required for address node " + walletNode.getDerivationPath());
+            }
+            return spendPrivKey.addPrivate(ECKey.fromPrivate(tweak));
+        }
+
         if(source == KeystoreSource.SW_PAYMENT_CODE) {
             try {
                 if(walletNode.getKeyPurpose() != KeyPurpose.RECEIVE) {
@@ -222,6 +264,19 @@ public class Keystore extends Persistable {
     }
 
     public ECKey getPubKey(WalletNode walletNode) {
+        if(silentPaymentScanAddress != null && walletNode.getWallet().getPolicyType() == PolicyType.SINGLE_SP) {
+            ECKey spendKey = silentPaymentScanAddress.getSpendKey();
+            byte[] tweak = walletNode.getSilentPaymentTweak();
+            if(tweak == null) {
+                if(walletNode.isPurposeNode()) {
+                    return spendKey;
+                }
+                throw new IllegalStateException("Silent payment tweak is required for address node " + walletNode.getDerivationPath());
+            }
+            ECKey tweakPoint = ECKey.fromPublicOnly(ECKey.fromPrivate(tweak));
+            return spendKey.add(tweakPoint, true);
+        }
+
         if(source == KeystoreSource.SW_PAYMENT_CODE) {
             try {
                 PaymentAddress paymentAddress = getPaymentAddress(walletNode.getKeyPurpose(), walletNode.getIndex());
@@ -244,7 +299,7 @@ public class Keystore extends Persistable {
     }
 
     public ECKey getPubKeyForDerivation(KeyDerivation keyDerivation) {
-        if(keyDerivation != null) {
+        if(keyDerivation != null && extendedPublicKey != null) {
             List<ChildNumber> derivation = keyDerivation.getDerivation();
             String fingerprint = Utils.bytesToHex(this.extendedPublicKey.getKey().getFingerprint());
             if(derivation.size() > this.keyDerivation.getDerivation().size()) {
@@ -263,6 +318,33 @@ public class Keystore extends Persistable {
         return null;
     }
 
+    public ECKey getSpendPrivateKey(Map<ECKey, KeyDerivation> spendDerivations) throws MnemonicException {
+        String masterFingerprint = getKeyDerivation().getMasterFingerprint();
+        for(Map.Entry<ECKey, KeyDerivation> entry : spendDerivations.entrySet()) {
+            if(masterFingerprint.equals(entry.getValue().getMasterFingerprint())) {
+                DeterministicKey derivedKey = getExtendedMasterPrivateKey().getKey(entry.getValue().getDerivation());
+                ECKey spendPrivKey = ECKey.fromPrivate(derivedKey.getPrivKeyBytes(), true);
+
+                if(!Arrays.equals(spendPrivKey.getPubKey(), entry.getKey().getPubKey())) {
+                    throw new IllegalStateException("Derived spend private key does not match PSBT spend public key");
+                }
+
+                return spendPrivKey;
+            }
+        }
+
+        List<ChildNumber> spendDerivation = KeyDerivation.getBip352SpendDerivation(getKeyDerivation().getDerivation());
+        DeterministicKey derivedKey = getExtendedMasterPrivateKey().getKey(spendDerivation);
+        ECKey spendPrivKey = ECKey.fromPrivate(derivedKey.getPrivKeyBytes(), true);
+
+        ECKey expectedSpendPubKey = getSilentPaymentScanAddress().getSpendKey();
+        if(!Arrays.equals(spendPrivKey.getPubKey(), expectedSpendPubKey.getPubKey())) {
+            throw new IllegalStateException("Derived spend private key does not match keystore spend public key");
+        }
+
+        return spendPrivKey;
+    }
+
     public boolean isValid() {
         try {
             checkKeystore();
@@ -290,8 +372,8 @@ public class Keystore extends Persistable {
             throw new InvalidKeystoreException("No key derivation specified");
         }
 
-        if(extendedPublicKey == null) {
-            throw new InvalidKeystoreException("No extended public key specified");
+        if(extendedPublicKey == null && silentPaymentScanAddress == null) {
+            throw new InvalidKeystoreException("No extended public key or silent payment scan address specified");
         }
 
         if(label.isEmpty()) {
@@ -315,7 +397,7 @@ public class Keystore extends Persistable {
                 throw new InvalidKeystoreException("Source of " + source + " but no seed or master private key is present");
             }
 
-            if(!extendedPublicKeyChecked && ((seed != null && !seed.isEncrypted()) || (masterPrivateExtendedKey != null && !masterPrivateExtendedKey.isEncrypted()))) {
+            if(!extendedPublicKeyChecked && extendedPublicKey != null && ((seed != null && !seed.isEncrypted()) || (masterPrivateExtendedKey != null && !masterPrivateExtendedKey.isEncrypted()))) {
                 try {
                     List<ChildNumber> derivation = getKeyDerivation().getDerivation();
                     DeterministicKey derivedKey = getExtendedMasterPrivateKey().getKey(derivation);
@@ -329,6 +411,21 @@ public class Keystore extends Persistable {
                     throw new InvalidKeystoreException("Invalid mnemonic specified for seed", e);
                 }
             }
+
+            if(!silentPaymentScanAddressChecked && silentPaymentScanAddress != null && ((seed != null && !seed.isEncrypted()) || (masterPrivateExtendedKey != null && !masterPrivateExtendedKey.isEncrypted()))) {
+                try {
+                    List<ChildNumber> derivation = getKeyDerivation().getDerivation();
+                    DeterministicKey derivedScanKey = getExtendedMasterPrivateKey().getKey(KeyDerivation.getBip352ScanDerivation(derivation));
+                    DeterministicKey derivedSpendKey = getExtendedMasterPrivateKey().getKey(KeyDerivation.getBip352SpendDerivation(derivation));
+                    SilentPaymentScanAddress derivedScanAddress = new SilentPaymentScanAddress(derivedScanKey, derivedSpendKey);
+                    if(!derivedScanAddress.equals(getSilentPaymentScanAddress())) {
+                        throw new InvalidKeystoreException("Specified silent payments scan address does not match scan and spend keys derived from seed");
+                    }
+                    silentPaymentScanAddressChecked = true;
+                } catch(MnemonicException e) {
+                    throw new InvalidKeystoreException("Invalid mnemonic specified for seed", e);
+                }
+            }
         }
 
         if(source == KeystoreSource.SW_PAYMENT_CODE) {
@@ -365,43 +462,54 @@ public class Keystore extends Persistable {
         if(bip47ExtendedPrivateKey != null) {
             copy.setBip47ExtendedPrivateKey(bip47ExtendedPrivateKey.copy());
         }
+        if(silentPaymentScanAddress != null) {
+            copy.setSilentPaymentScanAddress(silentPaymentScanAddress.copy());
+        }
         return copy;
     }
 
-    public static Keystore fromSeed(DeterministicSeed seed, List<ChildNumber> derivation) throws MnemonicException {
+    public static Keystore fromSeed(DeterministicSeed seed, PolicyType policyType, List<ChildNumber> derivation) throws MnemonicException {
         Keystore keystore = new Keystore();
         keystore.setSeed(seed);
         keystore.setLabel(seed.getType().name());
-        rederiveKeystoreFromMaster(keystore, derivation);
+        rederiveKeystoreFromMaster(keystore, policyType, derivation);
         return keystore;
     }
 
-    public static Keystore fromMasterPrivateExtendedKey(MasterPrivateExtendedKey masterPrivateExtendedKey, List<ChildNumber> derivation) throws MnemonicException {
+    public static Keystore fromMasterPrivateExtendedKey(MasterPrivateExtendedKey masterPrivateExtendedKey, PolicyType policyType, List<ChildNumber> derivation) throws MnemonicException {
         Keystore keystore = new Keystore();
         keystore.setMasterPrivateExtendedKey(masterPrivateExtendedKey);
         keystore.setLabel("Master Key");
-        rederiveKeystoreFromMaster(keystore, derivation);
+        rederiveKeystoreFromMaster(keystore, policyType, derivation);
         return keystore;
     }
 
-    private static void rederiveKeystoreFromMaster(Keystore keystore, List<ChildNumber> derivation) throws MnemonicException {
+    private static void rederiveKeystoreFromMaster(Keystore keystore, PolicyType policyType, List<ChildNumber> derivation) throws MnemonicException {
         ExtendedKey xprv = keystore.getExtendedMasterPrivateKey();
         String masterFingerprint = Utils.bytesToHex(xprv.getKey().getFingerprint());
-        DeterministicKey derivedKey = xprv.getKey(derivation);
-        DeterministicKey derivedKeyPublicOnly = derivedKey.dropPrivateBytes().dropParent();
-        ExtendedKey xpub = new ExtendedKey(derivedKeyPublicOnly, derivedKey.getParentFingerprint(), derivation.isEmpty() ? ChildNumber.ZERO : derivation.get(derivation.size() - 1));
 
         keystore.setSource(KeystoreSource.SW_SEED);
         keystore.setWalletModel(WalletModel.SPARROW);
         keystore.setKeyDerivation(new KeyDerivation(masterFingerprint, KeyDerivation.writePath(derivation)));
-        keystore.setExtendedPublicKey(ExtendedKey.fromDescriptor(xpub.toString()));
 
-        int account = ScriptType.getScriptTypesForPolicyType(PolicyType.SINGLE).stream()
-                .mapToInt(scriptType -> scriptType.getAccount(keystore.getKeyDerivation().getDerivationPath())).filter(idx -> idx > -1).findFirst().orElse(0);
-        List<ChildNumber> bip47Derivation = KeyDerivation.getBip47Derivation(account);
-        DeterministicKey bip47Key = xprv.getKey(bip47Derivation);
-        ExtendedKey bip47ExtendedPrivateKey = new ExtendedKey(bip47Key, bip47Key.getParentFingerprint(), bip47Derivation.get(bip47Derivation.size() - 1));
-        keystore.setBip47ExtendedPrivateKey(ExtendedKey.fromDescriptor(bip47ExtendedPrivateKey.toString()));
+        if(policyType == PolicyType.SINGLE_SP) {
+            DeterministicKey scanKey = xprv.getKey(KeyDerivation.getBip352ScanDerivation(derivation));
+            DeterministicKey spendKey = xprv.getKey(KeyDerivation.getBip352SpendDerivation(derivation));
+            SilentPaymentScanAddress spScanAddress = new SilentPaymentScanAddress(ECKey.fromPrivate(scanKey.getPrivKey()), ECKey.fromPublicOnly(spendKey));
+            keystore.setSilentPaymentScanAddress(spScanAddress);
+        } else {
+            DeterministicKey derivedKey = xprv.getKey(derivation);
+            DeterministicKey derivedKeyPublicOnly = derivedKey.dropPrivateBytes().dropParent();
+            ExtendedKey xpub = new ExtendedKey(derivedKeyPublicOnly, derivedKey.getParentFingerprint(), derivation.isEmpty() ? ChildNumber.ZERO : derivation.get(derivation.size() - 1));
+            keystore.setExtendedPublicKey(ExtendedKey.fromDescriptor(xpub.toString()));
+
+            int account = ScriptType.getScriptTypesForPolicyType(PolicyType.SINGLE_HD).stream()
+                    .mapToInt(scriptType -> scriptType.getAccount(keystore.getKeyDerivation().getDerivationPath())).filter(idx -> idx > -1).findFirst().orElse(0);
+            List<ChildNumber> bip47Derivation = KeyDerivation.getBip47Derivation(account);
+            DeterministicKey bip47Key = xprv.getKey(bip47Derivation);
+            ExtendedKey bip47ExtendedPrivateKey = new ExtendedKey(bip47Key, bip47Key.getParentFingerprint(), bip47Derivation.get(bip47Derivation.size() - 1));
+            keystore.setBip47ExtendedPrivateKey(ExtendedKey.fromDescriptor(bip47ExtendedPrivateKey.toString()));
+        }
     }
 
     public boolean isEncrypted() {

src/main/java/com/sparrowwallet/drongo/wallet/MasterPrivateExtendedKey.java

@@ -24,6 +24,12 @@ public class MasterPrivateExtendedKey extends Persistable implements Encryptable
         this.encryptedKey = encryptedKey;
     }
 
+    public MasterPrivateExtendedKey(DeterministicKey key) {
+        this.privateKey = key.getPrivKeyBytes();
+        this.chainCode = key.getChainCode();
+        this.encryptedKey = null;
+    }
+
     public DeterministicKey getPrivateKey() {
         return HDKeyDerivation.createMasterPrivKeyFromBytes(privateKey, chainCode);
     }

src/main/java/com/sparrowwallet/drongo/wallet/Payment.java

@@ -1,6 +1,13 @@
 package com.sparrowwallet.drongo.wallet;
 
 import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.address.P2AAddress;
+import com.sparrowwallet.drongo.dns.DnsPayment;
+import com.sparrowwallet.drongo.dns.DnsPaymentCache;
+
+import java.util.Arrays;
+import java.util.Locale;
+import java.util.stream.Collectors;
 
 public class Payment {
     private Address address;
@@ -15,10 +22,10 @@ public class Payment {
 
     public Payment(Address address, String label, long amount, boolean sendMax, Type type) {
         this.address = address;
-        this.label = label;
+        this.label = label == null && address instanceof P2AAddress ? address.getOutputScriptDataType() : label;
         this.amount = amount;
         this.sendMax = sendMax;
-        this.type = type;
+        this.type = type == Type.DEFAULT && address instanceof P2AAddress ? Type.ANCHOR : type;
     }
 
     public Address getAddress() {
@@ -62,6 +69,26 @@ public class Payment {
     }
 
     public enum Type {
-        DEFAULT, WHIRLPOOL_FEE, FAKE_MIX, MIX;
+        DEFAULT, WHIRLPOOL_FEE, FAKE_MIX, MIX, ANCHOR;
+
+        public String toDisplayString() {
+            return Arrays.stream(this.toString().toLowerCase(Locale.ROOT).split("_"))
+                    .map(w -> Character.toUpperCase(w.charAt(0)) + w.substring(1))
+                    .collect(Collectors.joining(" "));
+        }
+    }
+
+    public String getDisplayAddress() {
+        return address.toString();
+    }
+
+    @Override
+    public String toString() {
+        DnsPayment dnsPayment = DnsPaymentCache.getDnsPayment(this);
+        if(dnsPayment != null) {
+            return dnsPayment.toString();
+        }
+
+        return getDisplayAddress();
     }
 }

src/main/java/com/sparrowwallet/drongo/wallet/Persistable.java

@@ -1,6 +1,8 @@
 package com.sparrowwallet.drongo.wallet;
 
 public class Persistable {
+    public static final int MAX_LABEL_LENGTH = 255;
+
     private Long id;
 
     public Long getId() {

src/main/java/com/sparrowwallet/drongo/wallet/SortDirection.java

@@ -0,0 +1,5 @@
+package com.sparrowwallet.drongo.wallet;
+
+public enum SortDirection {
+    ASCENDING, DESCENDING
+}

src/main/java/com/sparrowwallet/drongo/wallet/TableType.java

@@ -0,0 +1,5 @@
+package com.sparrowwallet.drongo.wallet;
+
+public enum TableType {
+    TRANSACTIONS, UTXOS, RECEIVE_ADDRESSES, CHANGE_ADDRESSES, SEARCH_WALLET, WALLET_SUMMARY
+}

src/main/java/com/sparrowwallet/drongo/wallet/TransactionParameters.java

@@ -0,0 +1,41 @@
+package com.sparrowwallet.drongo.wallet;
+
+import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.protocol.Transaction;
+
+import java.util.List;
+import java.util.Optional;
+import java.util.Set;
+
+public record TransactionParameters(List<UtxoSelector> utxoSelectors, List<TxoFilter> txoFilters, List<Payment> payments, List<byte[]> opReturns,
+                                    Set<WalletNode> excludedChangeNodes, double feeRate, double longTermFeeRate, double minRelayFeeRate, Long fee,
+                                    Integer currentBlockHeight, boolean groupByAddress, boolean includeMempoolOutputs, boolean allowRbf) {
+
+    public boolean containsSendMaxPayment() {
+        return payments.stream().anyMatch(Payment::isSendMax);
+    }
+
+    public Optional<Payment> getFirstSendMaxPayment() {
+        return payments.stream().filter(Payment::isSendMax).findFirst();
+    }
+
+    public List<Address> getPaymentAddresses() {
+        return payments.stream().map(Payment::getAddress).toList();
+    }
+
+    public long getTotalPaymentAmount() {
+        return payments.stream().mapToLong(Payment::getAmount).sum();
+    }
+
+    public long getTotalPaymentAmountLessExcluded(Payment excludedPayment) {
+        return payments.stream().filter(payment -> !excludedPayment.equals(payment)).mapToLong(Payment::getAmount).sum();
+    }
+
+    public boolean isMinRelayRate() {
+        return ((feeRate == minRelayFeeRate && minRelayFeeRate > 0d) || feeRate == Transaction.DEFAULT_MIN_RELAY_FEE) && fee == null;
+    }
+
+    public long getRequiredFeeAmount(double virtualSize) {
+        return fee == null ? (long)Math.floor(feeRate * virtualSize) : fee;
+    }
+}

src/main/java/com/sparrowwallet/drongo/wallet/WalletModel.java

@@ -5,18 +5,19 @@ import java.util.Locale;
 public enum WalletModel {
     SEED, SPARROW, BITCOIN_CORE, ELECTRUM, TREZOR_1, TREZOR_T, COLDCARD, LEDGER_NANO_S, LEDGER_NANO_X, DIGITALBITBOX_01, KEEPKEY, SPECTER_DESKTOP, COBO_VAULT,
     BITBOX_02, SPECTER_DIY, PASSPORT, BLUE_WALLET, KEYSTONE, SEEDSIGNER, CARAVAN, GORDIAN_SEED_TOOL, JADE, LEDGER_NANO_S_PLUS, EPS, TAPSIGNER, SATSCARD, LABELS,
-    BSMS, KRUX, SATOCHIP, TRANSACTIONS, AIRGAP_VAULT, TREZOR_SAFE_3, SATSCHIP, SAMOURAI, TREZOR_SAFE_5;
+    BSMS, KRUX, SATOCHIP, TRANSACTIONS, AIRGAP_VAULT, TREZOR_SAFE_3, SATSCHIP, SAMOURAI, TREZOR_SAFE_5, LEDGER_STAX, LEDGER_FLEX, ONEKEY_CLASSIC_1S, ONEKEY_PRO,
+    KEYCARD_SHELL, KEYCARD, TREZOR_SAFE_7, LEDGER_NANO_GEN5;
 
     public static WalletModel getModel(String model) {
         return valueOf(model.toUpperCase(Locale.ROOT));
     }
 
     public String getType() {
-        if(this == TREZOR_1 || this == TREZOR_T || this == TREZOR_SAFE_3 || this == TREZOR_SAFE_5) {
+        if(this == TREZOR_1 || this == TREZOR_T || this == TREZOR_SAFE_3 || this == TREZOR_SAFE_5 || this == TREZOR_SAFE_7) {
             return "trezor";
         }
 
-        if(this == LEDGER_NANO_S || this == LEDGER_NANO_X || this == LEDGER_NANO_S_PLUS) {
+        if(this == LEDGER_NANO_S || this == LEDGER_NANO_X || this == LEDGER_NANO_S_PLUS || this == LEDGER_STAX || this == LEDGER_FLEX || this == LEDGER_NANO_GEN5) {
             return "ledger";
         }
 
@@ -52,11 +53,20 @@ public enum WalletModel {
             return "airgapvault";
         }
 
+        if(this == ONEKEY_CLASSIC_1S || this == ONEKEY_PRO) {
+            return "onekey";
+        }
+
+        if(this == KEYCARD_SHELL || this == KEYCARD) {
+            return "keycard";
+        }
+
         return this.toString().toLowerCase(Locale.ROOT);
     }
 
     public boolean alwaysIncludeNonWitnessUtxo() {
-        if(this == COLDCARD || this == COBO_VAULT || this == PASSPORT || this == KEYSTONE || this == GORDIAN_SEED_TOOL || this == SEEDSIGNER || this == KRUX) {
+        if(this == COLDCARD || this == COBO_VAULT || this == PASSPORT || this == KEYSTONE || this == GORDIAN_SEED_TOOL || this == SEEDSIGNER || this == KRUX || this == JADE ||
+           this == TAPSIGNER || this == SATOCHIP || this == KEYCARD_SHELL || this == KEYCARD) {
             return false;
         }
 
@@ -64,20 +74,20 @@ public enum WalletModel {
     }
 
     public boolean requiresPinPrompt() {
-        return (this == TREZOR_1 || this == KEEPKEY);
+        return (this == TREZOR_1 || this == KEEPKEY || this == ONEKEY_CLASSIC_1S);
     }
 
     public boolean externalPassphraseEntry() {
-        return (this == TREZOR_1 || this == KEEPKEY);
+        return (this == TREZOR_1 || this == KEEPKEY || this == ONEKEY_CLASSIC_1S);
     }
 
     public boolean isCard() {
-        return (this == TAPSIGNER || this == SATSCHIP || this == SATSCARD || this == SATOCHIP);
+        return (this == TAPSIGNER || this == SATSCHIP || this == SATSCARD || this == SATOCHIP || this == KEYCARD);
     }
 
     public boolean hasUsb() {
-        return (this == TREZOR_1 || this == TREZOR_T || this == TREZOR_SAFE_3 || this == TREZOR_SAFE_5 || this == LEDGER_NANO_S || this == LEDGER_NANO_X || this == LEDGER_NANO_S_PLUS ||
-                this == DIGITALBITBOX_01 || this == BITBOX_02 || this == COLDCARD || this == KEEPKEY || this == JADE);
+        return (this == TREZOR_1 || this == TREZOR_T || this == TREZOR_SAFE_3 || this == TREZOR_SAFE_5 || this == TREZOR_SAFE_7 || this == LEDGER_NANO_S || this == LEDGER_NANO_X || this == LEDGER_NANO_S_PLUS ||
+                this == LEDGER_STAX || this == LEDGER_FLEX || this == LEDGER_NANO_GEN5 || this == DIGITALBITBOX_01 || this == BITBOX_02 || this == COLDCARD || this == KEEPKEY || this == JADE || this == ONEKEY_CLASSIC_1S || this == ONEKEY_PRO);
     }
 
     public int getMinPinLength() {
@@ -89,7 +99,9 @@ public enum WalletModel {
     }
 
     public int getMaxPinLength() {
-        if(this == SATOCHIP) {
+        if(this == KEYCARD) {
+            return 6;
+        } else if(this == SATOCHIP) {
             return 16;
         } else {
             return 32;
@@ -104,8 +116,16 @@ public enum WalletModel {
         }
     }
 
+    public boolean hasZeroInPin() {
+        if(this == ONEKEY_CLASSIC_1S) {
+            return true;
+        } else {
+            return false;
+        }
+    }
+
     public boolean requiresSeedInitialization() {
-        if(this == SATOCHIP) {
+        if(this == SATOCHIP || this == KEYCARD) {
             return true;
         } else {
             return false;
@@ -113,7 +133,7 @@ public enum WalletModel {
     }
 
     public boolean supportsBackup() {
-        if(this == SATOCHIP || this == SATSCHIP) {
+        if(this == SATOCHIP || this == SATSCHIP || this == KEYCARD) {
             return false;
         } else {
             return true;
@@ -161,10 +181,20 @@ public enum WalletModel {
         for(String word : words) {
             if(word.equals("1")) {
                 word = "one";
+            } else if(Character.isDigit(word.charAt(0))) {
+                word = word.toUpperCase(Locale.ROOT);
+            } else if(BITBOX_02.getType().startsWith(word)) {
+                word = "BitBox";
+            } else if(word.equals(ONEKEY_PRO.getType())) {
+                word = "OneKey";
+            } else if(word.equals("diy")) {
+                word = "DIY";
             }
             builder.append(Character.toUpperCase(word.charAt(0)));
             builder.append(word.substring(1));
-            builder.append(" ");
+            if(this != BLUE_WALLET) {
+                builder.append(" ");
+            }
         }
 
         return builder.toString().trim();

src/main/java/com/sparrowwallet/drongo/wallet/WalletNode.java

@@ -5,6 +5,7 @@ import com.sparrowwallet.drongo.KeyPurpose;
 import com.sparrowwallet.drongo.address.Address;
 import com.sparrowwallet.drongo.crypto.ChildNumber;
 import com.sparrowwallet.drongo.crypto.ECKey;
+import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.Script;
 
 import java.util.*;
@@ -14,6 +15,7 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
     private final String derivationPath;
     private String label;
     private Address address;
+    private byte[] silentPaymentTweak;
     private TreeSet<WalletNode> children = new TreeSet<>();
     private TreeSet<BlockTransactionHashIndex> transactionOutputs = new TreeSet<>();
 
@@ -98,6 +100,10 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
         return derivation;
     }
 
+    public boolean isPurposeNode() {
+        return getDerivation().size() == 1;
+    }
+
     public String getLabel() {
         return label;
     }
@@ -106,6 +112,14 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
         this.label = label;
     }
 
+    public byte[] getSilentPaymentTweak() {
+        return silentPaymentTweak;
+    }
+
+    public void setSilentPaymentTweak(byte[] silentPaymentTweak) {
+        this.silentPaymentTweak = silentPaymentTweak;
+    }
+
     public Long getValue() {
         if(transactionOutputs == null) {
             return null;
@@ -220,6 +234,10 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
     }
 
     public synchronized Set<WalletNode> fillToIndex(int index) {
+        if(wallet.getPolicyType() == PolicyType.SINGLE_SP) {
+            return Collections.emptySet();
+        }
+
         //Optimization to check if child nodes already monotonically increment to the desired index
         int indexCheck = 0;
         for(WalletNode childNode : getChildren()) {
@@ -245,6 +263,25 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
         return newNodes;
     }
 
+    public synchronized WalletNode addSilentPaymentChild(Wallet wallet, int index, byte[] tweak) {
+        if(children.stream().anyMatch(n -> n.getIndex() == index)) {
+            return null;
+        }
+
+        WalletNode node = new WalletNode(wallet, getKeyPurpose(), index);
+        node.setSilentPaymentTweak(tweak);
+        children.add(node);
+
+        if(wallet.isValid() && !wallet.getDetachedLabels().isEmpty()) {
+            String label = wallet.getDetachedLabels().remove(node.getAddress().toString());
+            if(label != null && (node.getLabel() == null || node.getLabel().isEmpty())) {
+                node.setLabel(label);
+            }
+        }
+
+        return node;
+    }
+
     /**
      * @return The highest used index, or null if no addresses are used
      */
@@ -353,6 +390,7 @@ public class WalletNode extends Persistable implements Comparable<WalletNode> {
         copy.setId(getId());
         copy.setLabel(label);
         copy.setAddress(address);
+        copy.setSilentPaymentTweak(silentPaymentTweak);
 
         for(WalletNode child : getChildren()) {
             copy.children.add(child.copy(walletCopy));

src/main/java/com/sparrowwallet/drongo/wallet/WalletNodePayment.java

@@ -0,0 +1,18 @@
+package com.sparrowwallet.drongo.wallet;
+
+public class WalletNodePayment extends Payment {
+    private final WalletNode walletNode;
+
+    public WalletNodePayment(WalletNode walletNode, String label, long amount, boolean sendMax) {
+        this(walletNode, label, amount, sendMax, Type.DEFAULT);
+    }
+
+    public WalletNodePayment(WalletNode walletNode, String label, long amount, boolean sendMax, Type type) {
+        super(walletNode.getAddress(), label, amount, sendMax, type);
+        this.walletNode = walletNode;
+    }
+
+    public WalletNode getWalletNode() {
+        return walletNode;
+    }
+}

src/main/java/com/sparrowwallet/drongo/wallet/WalletTable.java

@@ -0,0 +1,61 @@
+package com.sparrowwallet.drongo.wallet;
+
+public class WalletTable extends Persistable {
+    private final TableType tableType;
+    private final Double[] widths;
+    private final int sortColumn;
+    private final SortDirection sortDirection;
+
+    public WalletTable(TableType tableType, Double[] widths, int sortColumn, SortDirection sortDirection) {
+        this.tableType = tableType;
+        this.widths = widths;
+        this.sortColumn = sortColumn;
+        this.sortDirection = sortDirection;
+    }
+
+    public WalletTable(TableType tableType, Double[] widths, Sort sort) {
+        this.tableType = tableType;
+        this.widths = widths;
+        this.sortColumn = sort.sortColumn;
+        this.sortDirection = sort.sortDirection;
+    }
+
+    public TableType getTableType() {
+        return tableType;
+    }
+
+    public Double[] getWidths() {
+        return widths;
+    }
+
+    public int getSortColumn() {
+        return sortColumn;
+    }
+
+    public SortDirection getSortDirection() {
+        return sortDirection;
+    }
+
+    public Sort getSort() {
+        return new Sort(sortColumn, sortDirection);
+    }
+
+    @Override
+    public final boolean equals(Object o) {
+        if(this == o) {
+            return true;
+        }
+        if(!(o instanceof WalletTable that)) {
+            return false;
+        }
+
+        return tableType == that.tableType;
+    }
+
+    @Override
+    public int hashCode() {
+        return tableType.hashCode();
+    }
+
+    public record Sort(int sortColumn, SortDirection sortDirection) {}
+}

src/main/java/com/sparrowwallet/drongo/wallet/WalletTransaction.java

@@ -1,10 +1,15 @@
 package com.sparrowwallet.drongo.wallet;
 
 import com.sparrowwallet.drongo.address.Address;
+import com.sparrowwallet.drongo.dns.DnsPayment;
+import com.sparrowwallet.drongo.dns.DnsPaymentCache;
+import com.sparrowwallet.drongo.policy.PolicyType;
 import com.sparrowwallet.drongo.protocol.*;
 import com.sparrowwallet.drongo.psbt.PSBT;
+import com.sparrowwallet.drongo.silentpayments.SilentPayment;
 
 import java.util.*;
+import java.util.stream.Collectors;
 
 /**
  * WalletTransaction contains a draft transaction along with associated metadata. The draft transaction has empty signatures but is otherwise complete.
@@ -21,17 +26,19 @@ public class WalletTransaction {
     private final Map<Sha256Hash, BlockTransaction> inputTransactions;
     private final List<Output> outputs;
 
-    private Map<Wallet, Map<Address, WalletNode>> addressNodeMap = new HashMap<>();
-
-    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, long fee) {
-        this(wallet, transaction, utxoSelectors, selectedUtxoSets, payments, Collections.emptyMap(), fee);
+    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, List<Output> outputs, long fee) {
+        this(wallet, transaction, utxoSelectors, selectedUtxoSets, payments, outputs, Collections.emptyMap(), fee);
     }
 
-    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, Map<WalletNode, Long> changeMap, long fee) {
-        this(wallet, transaction, utxoSelectors, selectedUtxoSets, payments, changeMap, fee, Collections.emptyMap());
+    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, List<Output> outputs, Map<WalletNode, Long> changeMap, long fee) {
+        this(wallet, transaction, utxoSelectors, selectedUtxoSets, payments, outputs, changeMap, fee, Collections.emptyMap());
     }
 
-    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, Map<WalletNode, Long> changeMap, long fee, Map<Sha256Hash, BlockTransaction> inputTransactions) {
+    public WalletTransaction(Wallet wallet, Transaction transaction, List<UtxoSelector> utxoSelectors, List<Map<BlockTransactionHashIndex, WalletNode>> selectedUtxoSets, List<Payment> payments, List<Output> outputs, Map<WalletNode, Long> changeMap, long fee, Map<Sha256Hash, BlockTransaction> inputTransactions) {
+        if(!outputs.stream().map(Output::getTransactionOutput).collect(Collectors.toSet()).containsAll(transaction.getOutputs())) {
+            throw new IllegalArgumentException("Transaction output list does not contain all outputs from the transaction");
+        }
+
         this.wallet = wallet;
         this.transaction = transaction;
         this.utxoSelectors = utxoSelectors;
@@ -40,7 +47,7 @@ public class WalletTransaction {
         this.changeMap = changeMap;
         this.fee = fee;
         this.inputTransactions = inputTransactions;
-        this.outputs = calculateOutputs();
+        this.outputs = outputs;
 
         for(Payment payment : payments) {
             payment.setLabel(getOutputLabel(payment));
@@ -110,7 +117,7 @@ public class WalletTransaction {
     }
 
     public List<Output> getOutputs() {
-        return outputs;
+        return Collections.unmodifiableList(outputs);
     }
 
     /**
@@ -129,10 +136,6 @@ public class WalletTransaction {
         return !utxoSelectors.isEmpty() && utxoSelectors.get(0) instanceof StonewallUtxoSelector;
     }
 
-    public boolean isConsolidationSend(Payment payment) {
-        return isWalletSend(getWallet(), payment);
-    }
-
     public boolean isPremixSend(Payment payment) {
         return isWalletSend(StandardAccount.WHIRLPOOL_PREMIX, payment);
     }
@@ -159,7 +162,7 @@ public class WalletTransaction {
             return false;
         }
 
-        return getAddressNodeMap(wallet).get(payment.getAddress()) != null;
+        return wallet.getWalletAddresses().get(payment.getAddress()) != null;
     }
 
     private String getOutputLabel(Payment payment) {
@@ -168,7 +171,7 @@ public class WalletTransaction {
         }
 
         if(payment.getType() == Payment.Type.WHIRLPOOL_FEE) {
-            return "Whirlpool fee";
+            return payment.getType().toDisplayString();
         } else if(isPremixSend(payment)) {
             int premixIndex = getOutputIndex(payment.getAddress(), payment.getAmount(), Collections.emptySet()) - 2;
             return "Premix #" + premixIndex;
@@ -189,9 +192,14 @@ public class WalletTransaction {
     public Wallet getToWallet(Collection<Wallet> wallets, Payment payment) {
         for(Wallet openWallet : wallets) {
             if(openWallet != getWallet() && openWallet.isValid()) {
-                WalletNode addressNode = openWallet.getWalletAddresses().get(payment.getAddress());
-                if(addressNode != null) {
-                    return addressNode.getWallet();
+                if(openWallet.getPolicyType() == PolicyType.SINGLE_SP && payment instanceof SilentPayment silentPayment
+                        && silentPayment.getSilentPaymentAddress().equals(openWallet.getSilentPaymentScanAddress().getSilentPaymentAddress())) {
+                    return openWallet;
+                } else {
+                    WalletNode addressNode = openWallet.getWalletAddresses().get(payment.getAddress());
+                    if(addressNode != null) {
+                        return addressNode.getWallet();
+                    }
                 }
             }
         }
@@ -200,63 +208,17 @@ public class WalletTransaction {
     }
 
     public boolean isDuplicateAddress(Payment payment) {
-        return getPayments().stream().filter(p -> payment != p).anyMatch(p -> payment.getAddress() != null && payment.getAddress().equals(p.getAddress()));
+        return getPayments().stream().filter(p -> payment != p && !(payment instanceof SilentPayment))
+                .anyMatch(p -> payment.getAddress() != null && payment.getAddress().equals(p.getAddress()));
     }
 
-    public void updateAddressNodeMap(Map<Wallet, Map<Address, WalletNode>> addressNodeMap, Wallet wallet) {
-        this.addressNodeMap = addressNodeMap;
-        getAddressNodeMap(wallet);
+    public boolean isConsolidation(Payment payment) {
+        return payment instanceof WalletNodePayment || (wallet != null && wallet.getPolicyType() == PolicyType.SINGLE_SP
+                && payment instanceof SilentPayment silentPayment && wallet.getSilentPaymentScanAddress().getSilentPaymentAddress().equals(silentPayment.getSilentPaymentAddress()));
     }
 
-    public Map<Address, WalletNode> getAddressNodeMap() {
-        return getAddressNodeMap(getWallet());
-    }
-
-    public Map<Address, WalletNode> getAddressNodeMap(Wallet wallet) {
-        Map<Address, WalletNode> walletAddresses = null;
-
-        Map<Address, WalletNode> walletAddressNodeMap = addressNodeMap.computeIfAbsent(wallet, w -> new LinkedHashMap<>());
-        for(Payment payment : payments) {
-            if(walletAddressNodeMap.containsKey(payment.getAddress())) {
-                continue;
-            }
-
-            if(payment.getAddress() != null && wallet != null) {
-                if(walletAddresses == null) {
-                    walletAddresses = wallet.getWalletAddresses();
-                }
-
-                WalletNode walletNode = walletAddresses.get(payment.getAddress());
-                walletAddressNodeMap.put(payment.getAddress(), walletNode);
-            }
-        }
-
-        return walletAddressNodeMap;
-    }
-
-    private List<Output> calculateOutputs() {
-        List<Output> outputs = new ArrayList<>();
-
-        for(int i = 0, paymentIndex = 0; i < transaction.getOutputs().size(); i++) {
-            TransactionOutput txOutput = transaction.getOutputs().get(i);
-            Address address = txOutput.getScript().getToAddress();
-            if(address == null) {
-                outputs.add(new NonAddressOutput(txOutput));
-            } else if(paymentIndex < payments.size()) {
-                Payment payment = payments.get(paymentIndex++);
-                outputs.add(new PaymentOutput(txOutput, payment));
-            }
-        }
-
-        Set<Integer> seenIndexes = new HashSet<>();
-        for(Map.Entry<WalletNode, Long> changeEntry : changeMap.entrySet()) {
-            int outputIndex = getOutputIndex(changeEntry.getKey().getAddress(), changeEntry.getValue(), seenIndexes);
-            TransactionOutput txOutput = transaction.getOutputs().get(outputIndex);
-            seenIndexes.add(outputIndex);
-            outputs.add(outputIndex, new ChangeOutput(txOutput, changeEntry.getKey(), changeEntry.getValue()));
-        }
-
-        return outputs;
+    public List<WalletNodePayment> getWalletNodePayments() {
+        return payments.stream().filter(payment -> payment instanceof WalletNodePayment).map(payment -> (WalletNodePayment)payment).collect(Collectors.toList());
     }
 
     public static class Output {
@@ -269,6 +231,10 @@ public class WalletTransaction {
         public TransactionOutput getTransactionOutput() {
             return transactionOutput;
         }
+
+        public Map<String, byte[]> getDnsSecProof() {
+            return null;
+        }
     }
 
     public static class NonAddressOutput extends Output {
@@ -288,13 +254,48 @@ public class WalletTransaction {
         public Payment getPayment() {
             return payment;
         }
+
+        public Map<String, byte[]> getDnsSecProof() {
+            DnsPayment dnsPayment = DnsPaymentCache.getDnsPayment(payment);
+            if(dnsPayment != null) {
+                if(dnsPayment.hasAddress()) {
+                    return Map.of(dnsPayment.hrn(), dnsPayment.proofChain());
+                } else if(dnsPayment.hasSilentPaymentAddress()) {
+                    return Map.of(dnsPayment.hrn(), dnsPayment.proofChain());
+                }
+            }
+
+            return super.getDnsSecProof();
+        }
     }
 
-    public static class ChangeOutput extends Output {
+    public static class SilentPaymentOutput extends PaymentOutput {
+        public SilentPaymentOutput(TransactionOutput transactionOutput, SilentPayment silentPayment) {
+            super(transactionOutput, silentPayment);
+        }
+
+        public SilentPayment getSilentPayment() {
+            return (SilentPayment)getPayment();
+        }
+    }
+
+    public static class SilentPaymentChangeOutput extends SilentPaymentOutput {
+        public SilentPaymentChangeOutput(TransactionOutput transactionOutput, SilentPayment silentPayment) {
+            super(transactionOutput, silentPayment);
+        }
+    }
+
+    public static class SilentPaymentConsolidationOutput extends SilentPaymentOutput {
+        public SilentPaymentConsolidationOutput(TransactionOutput transactionOutput, SilentPayment silentPayment) {
+            super(transactionOutput, silentPayment);
+        }
+    }
+
+    public static class WalletNodeOutput extends Output {
         private final WalletNode walletNode;
         private final Long value;
 
-        public ChangeOutput(TransactionOutput transactionOutput, WalletNode walletNode, Long value) {
+        public WalletNodeOutput(TransactionOutput transactionOutput, WalletNode walletNode, Long value) {
             super(transactionOutput);
             this.walletNode = walletNode;
             this.value = value;
@@ -308,4 +309,23 @@ public class WalletTransaction {
             return value;
         }
     }
+
+    public static class ConsolidationOutput extends WalletNodeOutput {
+        private final WalletNodePayment walletNodePayment;
+
+        public ConsolidationOutput(TransactionOutput transactionOutput, WalletNodePayment walletNodePayment, Long value) {
+            super(transactionOutput, walletNodePayment.getWalletNode(), value);
+            this.walletNodePayment = walletNodePayment;
+        }
+
+        public WalletNodePayment getWalletNodePayment() {
+            return walletNodePayment;
+        }
+    }
+
+    public static class ChangeOutput extends WalletNodeOutput {
+        public ChangeOutput(TransactionOutput transactionOutput, WalletNode walletNode, Long value) {
+            super(transactionOutput, walletNode, value);
+        }
+    }
 }

src/main/java/com/sparrowwallet/drongo/wallet/bip93/Codex32.java

@@ -0,0 +1,227 @@
+package com.sparrowwallet.drongo.wallet.bip93;
+
+import com.sparrowwallet.drongo.protocol.Bech32;
+import com.sparrowwallet.drongo.protocol.ProtocolException;
+import com.sparrowwallet.drongo.wallet.MnemonicException;
+
+import java.math.BigInteger;
+import java.util.Arrays;
+import java.util.Locale;
+
+public class Codex32 {
+
+    private static final String HRP = "ms";
+    private static final char SPECIAL_SHARE_INDEX = 's';
+    private static final int CODEX32_ID_LEN = 4;
+
+    public static class Codex32Data {
+        public final byte[] rawData;
+        public final ChecksumType checksumType;
+
+        public Codex32Data(byte[] rawData, ChecksumType checksumType) {
+            this.rawData = rawData;
+            this.checksumType = checksumType;
+        }
+
+        public byte getThreshold() {
+            return rawData[0];
+        }
+
+        public int getThresholdAsInt() {
+            return Bech32.CHARSET.charAt(getThreshold()) - '0';
+        }
+
+        public byte[] getIdentifier() {
+            return Arrays.copyOfRange(rawData, 1, 5);
+        }
+
+        public String identifierAsString() {
+            byte[] id = getIdentifier();
+
+            StringBuilder sb = new StringBuilder(CODEX32_ID_LEN);
+            for(byte b : id) {
+                sb.append(Bech32.CHARSET.charAt(b));
+            }
+            return sb.toString();
+        }
+
+        public byte getShareIndex() {
+            return rawData[5];
+        }
+
+        public boolean isUnsharedSecret() {
+            return getShareIndex() == Bech32.CHARSET_REV[SPECIAL_SHARE_INDEX];
+        }
+
+        public byte[] getPayload() {
+            return Arrays.copyOfRange(rawData, 6, rawData.length);
+        }
+
+        public byte[] payloadToBip32Secret() throws MnemonicException {
+            if(!isUnsharedSecret()) {
+                throw new MnemonicException("Trying to get secret from non-secret share");
+            }
+            byte[] payload = getPayload();
+            return Bech32.convertBits(payload, 0, payload.length, 5, 8, false, false);
+        }
+    }
+
+    public static String encode(Codex32Data data) throws MnemonicException {
+        byte[] checksum = createChecksum(data.rawData, data.checksumType);
+
+        StringBuilder sb = new StringBuilder();
+        sb.append(Codex32.HRP);
+        sb.append(Bech32.BECH32_SEPARATOR);
+        for(byte b : data.rawData) {
+            sb.append(Bech32.CHARSET.charAt(b));
+        }
+        for(byte b : checksum) {
+            sb.append(Bech32.CHARSET.charAt(b));
+        }
+        String result =  sb.toString();
+        validate(result, 2);
+        return result;
+    }
+
+    public static Codex32Data decode(String str) throws MnemonicException {
+        final int separatorPos = str.lastIndexOf(Bech32.BECH32_SEPARATOR);
+
+        validate(str, separatorPos);
+
+        byte[] rawData = Bech32.rawDecode(str, separatorPos);
+        int dataLen = rawData.length;
+
+        ChecksumType checksumType = verifyChecksum(rawData);
+
+        byte[] dataPart = new byte[dataLen - checksumType.length];
+        System.arraycopy(rawData, 0, dataPart, 0, dataLen - checksumType.length);
+
+        return new Codex32Data(dataPart, checksumType);
+    }
+
+    public static void validate(String str, int separatorPos) throws MnemonicException {
+        if(str.length() < 48 || str.length() > 127) {
+            throw new MnemonicException("Input invalid length: " + str.length());
+        }
+
+        try {
+            // Can set checksum len to zero, since we validate if string is too short above
+            Bech32.validate(str, 127, separatorPos, 0);
+        } catch(ProtocolException e) {
+            throw new MnemonicException("Input is not valid Bech32 string: " + e.getMessage());
+        }
+
+        String hrp = str.substring(0, separatorPos).toLowerCase(Locale.ROOT);
+        if(!HRP.equals(hrp)) {
+            throw new MnemonicException("Input does not have Codex32 \"ms\" human-readable part: " + hrp);
+        }
+
+        if(str.charAt(3) == '0' && str.toLowerCase(Locale.ROOT).charAt(8) != SPECIAL_SHARE_INDEX) {
+            throw new MnemonicException("Non zero threshold with unshared secret share: " + str.charAt(8));
+        }
+
+        int threshold = str.charAt(3) - '0';
+        if(!((threshold == 0) || (2 <= threshold && threshold <= 9))) {
+            throw new MnemonicException("Threshold not in range: " + threshold);
+        }
+    }
+
+    private static ChecksumType verifyChecksum(final byte[] values) throws MnemonicException {
+        int dataLen = values.length;
+
+        ChecksumType checksumType;
+        if(dataLen <= 92) {
+            checksumType = ChecksumType.CODEX32;
+        } else if(dataLen >= 96 && dataLen <= 124) {
+            checksumType = ChecksumType.CODEX32_LONG;
+        } else {
+            throw new MnemonicException("Data part invalid length: " + dataLen);
+        }
+
+        int payloadLen = dataLen - 6 - checksumType.length;
+        if((payloadLen * 5) % 8 > 4) {
+            throw new MnemonicException("Payload invalid length, incomplete group greater than 4 bits");
+        }
+        boolean verified = checksumType.polymod(values).equals(checksumType.constant);
+        if(!verified) {
+            throw new MnemonicException("Invalid Checksum");
+        }
+
+        return checksumType;
+    }
+
+    private static byte[] createChecksum(final byte[] values, ChecksumType checksumType) {
+        BigInteger polymodInt = checksumType.polymod(Arrays.copyOf(values, values.length + checksumType.length));
+        polymodInt = polymodInt.xor(checksumType.constant);
+        byte[] buffer = new byte[checksumType.length];
+        for(int i = 0; i < checksumType.length; i++) {
+            byte[] intermediate = polymodInt.shiftRight(5 * (checksumType.length - 1 - i)).toByteArray();
+            buffer[i] = (byte) (intermediate[intermediate.length - 1] & (byte) 31);
+        }
+        return buffer;
+    }
+
+    public enum ChecksumType {
+        CODEX32(new BigInteger("10ce0795c2fd1e62a", 16), 13) {
+            @Override
+            public BigInteger polymod(final byte[] values) {
+                BigInteger gen0 = new BigInteger("19dc500ce73fde210", 16);
+                BigInteger gen1 = new BigInteger("1bfae00def77fe529", 16);
+                BigInteger gen2 = new BigInteger("1fbd920fffe7bee52", 16);
+                BigInteger gen3 = new BigInteger("1739640bdeee3fdad", 16);
+                BigInteger gen4 = new BigInteger("07729a039cfc75f5a", 16);
+
+                BigInteger sixtyOnes = new BigInteger("0fffffffffffffff", 16);
+                BigInteger residue = new BigInteger("23181b3", 16);
+
+                for(byte v_i : values) {
+                    BigInteger b = residue.shiftRight(60);
+                    residue = residue.and(sixtyOnes).shiftLeft(5);
+                    residue = residue.xor(BigInteger.valueOf(v_i));
+                    if(b.shiftRight(0).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen0);
+                    if(b.shiftRight(1).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen1);
+                    if(b.shiftRight(2).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen2);
+                    if(b.shiftRight(3).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen3);
+                    if(b.shiftRight(4).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen4);
+                }
+                return residue;
+            }
+        },
+        CODEX32_LONG(new BigInteger("43381e570bf4798ab26", 16), 15) {
+            public BigInteger polymod(final byte[] values) {
+                BigInteger gen0 = new BigInteger("3d59d273535ea62d897", 16);
+                BigInteger gen1 = new BigInteger("7a9becb6361c6c51507", 16);
+                BigInteger gen2 = new BigInteger("543f9b7e6c38d8a2a0e", 16);
+                BigInteger gen3 = new BigInteger("0c577eaeccf1990d13c", 16);
+                BigInteger gen4 = new BigInteger("1887f74f8dc71b10651", 16);
+
+                BigInteger seventyOnes = new BigInteger("3fffffffffffffffff", 16);
+                BigInteger residue = new BigInteger("23181b3", 16);
+
+                for(byte v_i : values) {
+                    BigInteger b = residue.shiftRight(70);
+                    residue = residue.and(seventyOnes).shiftLeft(5);
+                    residue = residue.xor(BigInteger.valueOf(v_i));
+                    if(b.shiftRight(0).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen0);
+                    if(b.shiftRight(1).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen1);
+                    if(b.shiftRight(2).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen2);
+                    if(b.shiftRight(3).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen3);
+                    if(b.shiftRight(4).and(BigInteger.ONE).equals(BigInteger.ONE)) residue = residue.xor(gen4);
+                }
+                return residue;
+            }
+        };
+
+        public final BigInteger constant;
+        public final int length;
+
+        ChecksumType(BigInteger constant, int length) {
+            this.constant = constant;
+            this.length = length;
+        }
+
+        public BigInteger polymod(final byte[] values) {
+            return BigInteger.ZERO;
+        }
+    }
+}

src/main/java/module-info.java

@@ -6,7 +6,8 @@ open module com.sparrowwallet.drongo {
     requires org.slf4j;
     requires ch.qos.logback.core;
     requires ch.qos.logback.classic;
-    requires json.simple;
+    requires org.dnsjava;
+    requires com.github.benmanes.caffeine;
     exports com.sparrowwallet.drongo;
     exports com.sparrowwallet.drongo.psbt;
     exports com.sparrowwallet.drongo.protocol;
@@ -17,6 +18,9 @@ open module com.sparrowwallet.drongo {
     exports com.sparrowwallet.drongo.policy;
     exports com.sparrowwallet.drongo.uri;
     exports com.sparrowwallet.drongo.bip47;
+    exports com.sparrowwallet.drongo.dns;
+    exports com.sparrowwallet.drongo.wallet.bip93;
     exports com.sparrowwallet.drongo.wallet.slip39;
+    exports com.sparrowwallet.drongo.silentpayments;
     exports org.bitcoin;
 }

src/main/java/org/bitcoin/Secp256k1Context.java

@@ -4,6 +4,7 @@ import com.sparrowwallet.drongo.NativeUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.File;
 import java.io.IOException;
 
 public class Secp256k1Context {
@@ -33,23 +34,47 @@ public class Secp256k1Context {
     }
 
     private static boolean loadLibrary() {
+        String osName = System.getProperty("os.name");
+        String osArch = System.getProperty("os.arch");
+        String libName;
+        if(osName.startsWith("Windows")) {
+            libName = "libsecp256k1-0.dll";
+        } else if(osName.startsWith("Mac")) {
+            libName = "libsecp256k1.dylib";
+        } else {
+            libName = "libsecp256k1.so";
+        }
+
+        // Try loading from the application image lib/ directory
+        String javaHome = System.getProperty("java.home");
+        if(javaHome != null) {
+            File libFile = new File(javaHome, "lib" + java.io.File.separator + libName);
+            if(libFile.exists()) {
+                try {
+                    System.load(libFile.getAbsolutePath());
+                    return true;
+                } catch(UnsatisfiedLinkError e) {
+                    log.debug("Could not load libsecp256k1 from java.home, falling back to JAR extraction", e);
+                }
+            }
+        }
+
+        // Fallback: extract from JAR
         try {
-            String osName = System.getProperty("os.name");
-            String osArch = System.getProperty("os.arch");
             if(osName.startsWith("Mac") && osArch.equals("aarch64")) {
-                NativeUtils.loadLibraryFromJar("/native/osx/aarch64/libsecp256k1.dylib");
+                NativeUtils.loadLibraryFromJar("/native/osx/aarch64/" + libName);
             } else if(osName.startsWith("Mac")) {
-                NativeUtils.loadLibraryFromJar("/native/osx/x64/libsecp256k1.dylib");
+                NativeUtils.loadLibraryFromJar("/native/osx/x64/" + libName);
             } else if(osName.startsWith("Windows")) {
-                NativeUtils.loadLibraryFromJar("/native/windows/x64/libsecp256k1-0.dll");
+                NativeUtils.loadLibraryFromJar("/native/windows/x64/" + libName);
             } else if(osArch.equals("aarch64")) {
-                NativeUtils.loadLibraryFromJar("/native/linux/aarch64/libsecp256k1.so");
+                NativeUtils.loadLibraryFromJar("/native/linux/aarch64/" + libName);
             } else {
-                NativeUtils.loadLibraryFromJar("/native/linux/x64/libsecp256k1.so");
+                NativeUtils.loadLibraryFromJar("/native/linux/x64/" + libName);
             }
 
             return true;
-        } catch(IOException e) {
+        } catch(UnsatisfiedLinkError | IOException e) {
             log.error("Error loading libsecp256k1 library", e);
         }
 

src/main/resources/gpg/Calin_Culianu_(NilacTheGrim)_calin.culianu_gmail.com.asc

@@ -0,0 +1,38 @@
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+=PElt
+-----END PGP PUBLIC KEY BLOCK-----

src/main/resources/gpg/Christian_Decker_decker.christian_gmail.com.asc

@@ -0,0 +1,88 @@
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