diff --git a/blockchain/standalone/go.mod b/blockchain/standalone/go.mod
index aae36991..ed332320 100644
--- a/blockchain/standalone/go.mod
+++ b/blockchain/standalone/go.mod
@@ -4,8 +4,5 @@ go 1.11
 
 require (
 	github.com/decred/dcrd/chaincfg/chainhash v1.0.2
-	github.com/decred/dcrd/txscript/v3 v3.0.0-20200611204838-4c5825cf9054
 	github.com/decred/dcrd/wire v1.4.0
 )
-
-replace github.com/decred/dcrd/txscript/v3 => ../../txscript
diff --git a/blockchain/standalone/go.sum b/blockchain/standalone/go.sum
index 4ce8aeeb..d90765a1 100644
--- a/blockchain/standalone/go.sum
+++ b/blockchain/standalone/go.sum
@@ -1,28 +1,8 @@
-github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 h1:w1UutsfOrms1J05zt7ISrnJIXKzwaspym5BTKGx93EI=
-github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412/go.mod h1:WPjqKcmVOxf0XSf3YxCJs6N6AOSrOx3obionmG7T0y0=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dchest/siphash v1.2.1 h1:4cLinnzVJDKxTCl9B01807Yiy+W7ZzVHj/KIroQRvT4=
-github.com/dchest/siphash v1.2.1/go.mod h1:q+IRvb2gOSrUnYoPqHiyHXS0FOBBOdl6tONBlVnOnt4=
-github.com/decred/base58 v1.0.3 h1:KGZuh8d1WEMIrK0leQRM47W85KqCAdl2N+uagbctdDI=
-github.com/decred/base58 v1.0.3/go.mod h1:pXP9cXCfM2sFLb2viz2FNIdeMWmZDBKG3ZBYbiSM78E=
 github.com/decred/dcrd/chaincfg/chainhash v1.0.2 h1:rt5Vlq/jM3ZawwiacWjPa+smINyLRN07EO0cNBV6DGU=
 github.com/decred/dcrd/chaincfg/chainhash v1.0.2/go.mod h1:BpbrGgrPTr3YJYRN3Bm+D9NuaFd+zGyNeIKgrhCXK60=
-github.com/decred/dcrd/chaincfg/v3 v3.0.0 h1:+TFbu7ZmvBwM+SZz5mrj6cun9ts/6DAL5sqnsaFBHGQ=
-github.com/decred/dcrd/chaincfg/v3 v3.0.0/go.mod h1:EspyubQ7D2w6tjP7rBGDIE7OTbuMgBjR2F2kZFnh31A=
 github.com/decred/dcrd/crypto/blake256 v1.0.0 h1:/8DMNYp9SGi5f0w7uCm6d6M4OU2rGFK09Y2A4Xv7EE0=
 github.com/decred/dcrd/crypto/blake256 v1.0.0/go.mod h1:sQl2p6Y26YV+ZOcSTP6thNdn47hh8kt6rqSlvmrXFAc=
-github.com/decred/dcrd/crypto/ripemd160 v1.0.1 h1:TjRL4LfftzTjXzaufov96iDAkbY2R3aTvH2YMYa1IOc=
-github.com/decred/dcrd/crypto/ripemd160 v1.0.1/go.mod h1:F0H8cjIuWTRoixr/LM3REB8obcWkmYx0gbxpQWR8RPg=
-github.com/decred/dcrd/dcrec v1.0.0 h1:W+z6Es+Rai3MXYVoPAxYr5U1DGis0Co33scJ6uH2J6o=
-github.com/decred/dcrd/dcrec v1.0.0/go.mod h1:HIaqbEJQ+PDzQcORxnqen5/V1FR3B4VpIfmePklt8Q8=
-github.com/decred/dcrd/dcrec/edwards/v2 v2.0.1 h1:V6eqU1crZzuoFT4KG2LhaU5xDSdkHuvLQsj25wd7Wb4=
-github.com/decred/dcrd/dcrec/edwards/v2 v2.0.1/go.mod h1:d0H8xGMWbiIQP7gN3v2rByWUcuZPm9YsgmnfoxgbINc=
-github.com/decred/dcrd/dcrec/secp256k1/v3 v3.0.0 h1:sgNeV1VRMDzs6rzyPpxyM0jp317hnwiq58Filgag2xw=
-github.com/decred/dcrd/dcrec/secp256k1/v3 v3.0.0/go.mod h1:J70FGZSbzsjecRTiTzER+3f1KZLNaXkuv+yeFTKoxM8=
-github.com/decred/dcrd/dcrutil/v3 v3.0.0 h1:n6uQaTQynIhCY89XsoDk2WQqcUcnbD+zUM9rnZcIOZo=
-github.com/decred/dcrd/dcrutil/v3 v3.0.0/go.mod h1:iVsjcqVzLmYFGCZLet2H7Nq+7imV9tYcuY+0lC2mNsY=
 github.com/decred/dcrd/wire v1.4.0 h1:KmSo6eTQIvhXS0fLBQ/l7hG7QLcSJQKSwSyzSqJYDk0=
 github.com/decred/dcrd/wire v1.4.0/go.mod h1:WxC/0K+cCAnBh+SKsRjIX9YPgvrjhmE+6pZlel1G7Ro=
-github.com/decred/slog v1.1.0 h1:uz5ZFfmaexj1rEDgZvzQ7wjGkoSPjw2LCh8K+K1VrW4=
-github.com/decred/slog v1.1.0/go.mod h1:kVXlGnt6DHy2fV5OjSeuvCJ0OmlmTF6LFpEPMu/fOY0=
diff --git a/blockchain/standalone/tx.go b/blockchain/standalone/tx.go
index 157f6003..6f0963f6 100644
--- a/blockchain/standalone/tx.go
+++ b/blockchain/standalone/tx.go
@@ -9,10 +9,20 @@ import (
 	"math"
 
 	"github.com/decred/dcrd/chaincfg/chainhash"
-	"github.com/decred/dcrd/txscript/v3"
 	"github.com/decred/dcrd/wire"
 )
 
+const (
+	// These constants are opcodes are defined here to avoid a dependency on
+	// txscript.  They are used in consensus code which can't be changed without
+	// a vote anyway, so not referring to them directly via txscript is safe.
+	opData12 = 0x0c
+	opReturn = 0x6a
+	opTAdd   = 0xc1
+	opTSpend = 0xc2
+	opTGen   = 0xc3
+)
+
 var (
 	// zeroHash is the zero value for a chainhash.Hash and is defined as a
 	// package level variable to avoid the need to create a new instance every
@@ -70,9 +80,9 @@ func IsCoinBaseTx(tx *wire.MsgTx, isTreasuryEnabled bool) bool {
 		// TSpends have a TSpend opcode as the last byte of TxIn 0 and
 		// an OP_RETURN followed by at least one OP_TGEN in the zeroth
 		// TxOut script.
-		if tx.TxIn[0].SignatureScript[l-1] == txscript.OP_TSPEND &&
-			tx.TxOut[0].PkScript[0] == txscript.OP_RETURN &&
-			tx.TxOut[1].PkScript[0] == txscript.OP_TGEN {
+		if tx.TxIn[0].SignatureScript[l-1] == opTSpend &&
+			tx.TxOut[0].PkScript[0] == opReturn &&
+			tx.TxOut[1].PkScript[0] == opTGen {
 			return false
 		}
 	}
@@ -96,13 +106,13 @@ func IsTreasuryBase(tx *wire.MsgTx) bool {
 	}
 
 	if len(tx.TxOut[0].PkScript) != 1 ||
-		tx.TxOut[0].PkScript[0] != txscript.OP_TADD {
+		tx.TxOut[0].PkScript[0] != opTAdd {
 		return false
 	}
 
 	if len(tx.TxOut[1].PkScript) != 14 ||
-		tx.TxOut[1].PkScript[0] != txscript.OP_RETURN ||
-		tx.TxOut[1].PkScript[1] != txscript.OP_DATA_12 {
+		tx.TxOut[1].PkScript[0] != opReturn ||
+		tx.TxOut[1].PkScript[1] != opData12 {
 		return false
 	}