diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -486,7 +486,7 @@
     tx.vout.erase(tx.vout.begin() + outIdx);
 }
 
-static const unsigned int N_SIGHASH_OPTS = 6;
+static const unsigned int N_SIGHASH_OPTS = 12;
 static const struct {
     const char *flagStr;
     int flags;
@@ -497,6 +497,15 @@
     {"ALL|ANYONECANPAY", SIGHASH_ALL | SIGHASH_ANYONECANPAY},
     {"NONE|ANYONECANPAY", SIGHASH_NONE | SIGHASH_ANYONECANPAY},
     {"SINGLE|ANYONECANPAY", SIGHASH_SINGLE | SIGHASH_ANYONECANPAY},
+    {"ALL|FORKID", SIGHASH_ALL | SIGHASH_FORKID},
+    {"NONE|FORKID", SIGHASH_NONE | SIGHASH_FORKID},
+    {"SINGLE|FORKID", SIGHASH_SINGLE | SIGHASH_FORKID},
+    {"ALL|FORKID|ANYONECANPAY",
+     SIGHASH_ALL | SIGHASH_FORKID | SIGHASH_ANYONECANPAY},
+    {"NONE|FORKID|ANYONECANPAY",
+     SIGHASH_NONE | SIGHASH_FORKID | SIGHASH_ANYONECANPAY},
+    {"SINGLE|FORKID|ANYONECANPAY",
+     SIGHASH_SINGLE | SIGHASH_FORKID | SIGHASH_ANYONECANPAY},
 };
 
 static bool findSighashFlags(int &flags, const std::string &flagStr) {
@@ -548,7 +557,7 @@
 }
 
 static void MutateTxSign(CMutableTransaction &tx, const std::string &flagStr) {
-    int nHashType = SIGHASH_ALL;
+    int nHashType = SIGHASH_ALL | SIGHASH_FORKID;
 
     if ((flagStr.size() > 0) && !findSighashFlags(nHashType, flagStr)) {
         throw std::runtime_error("unknown sighash flag/sign option");
@@ -651,7 +660,9 @@
 
     const CKeyStore &keystore = tempKeystore;
 
-    bool fHashSingle = ((nHashType & ~SIGHASH_ANYONECANPAY) == SIGHASH_SINGLE);
+    bool fHashSingle =
+        ((nHashType & ~(SIGHASH_ANYONECANPAY | SIGHASH_FORKID)) ==
+         SIGHASH_SINGLE);
 
     // Sign what we can:
     for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
@@ -684,7 +695,8 @@
         UpdateTransaction(mergedTx, i, sigdata);
 
         if (!VerifyScript(
-                txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS,
+                txin.scriptSig, prevPubKey,
+                STANDARD_SCRIPT_VERIFY_FLAGS | SCRIPT_ENABLE_SIGHASH_FORKID,
                 MutableTransactionSignatureChecker(&mergedTx, i, amount))) {
             fComplete = false;
         }