diff --git a/base58.c b/base58.c
index ef67dae..ea3343f 100644
--- a/base58.c
+++ b/base58.c
@@ -46,7 +46,6 @@ size_t blkmk_address_to_script(void *out, size_t outsz, const char *addr) {
 	addrver = b58check(addrbin, sizeof(addrbin), addr, b58sz);
 	switch (addrver) {
 		case   0:  // Bitcoin pubkey hash
-		case  30:  // Segnet  pubkey hash
 		case 111:  // Testnet pubkey hash
 			if (outsz < (rv = 25))
 				return rv;
@@ -58,7 +57,6 @@ size_t blkmk_address_to_script(void *out, size_t outsz, const char *addr) {
 			cout[24] = 0xac;  // OP_CHECKSIG
 			return rv;
 		case   5:  // Bitcoin script hash
-		case  50:  // Segnet  script hash
 		case 196:  // Testnet script hash
 			if (outsz < (rv = 23))
 				return rv;
diff --git a/blkmaker.h b/blkmaker.h
index 9de20b2..0a0895c 100644
--- a/blkmaker.h
+++ b/blkmaker.h
@@ -13,7 +13,7 @@ extern "C" {
 
 #define BLKMAKER_VERSION (7L)
 #define BLKMAKER_MAX_BLOCK_VERSION (0x3fffffff)
-#define BLKMAKER_MAX_PRERULES_BLOCK_VERSION (5)
+#define BLKMAKER_MAX_PRERULES_BLOCK_VERSION (4)
 
 extern const char *blkmk_supported_rules[];
 extern bool blkmk_supports_rule(const char *rulename);