diff --git a/xcat/bitcoinRPC.py b/xcat/bitcoinRPC.py
index 338d8e3..0a3c73f 100644
--- a/xcat/bitcoinRPC.py
+++ b/xcat/bitcoinRPC.py
@@ -208,6 +208,9 @@ class bitcoinProxy():
         txout = CMutableTxOut(fundtx['amount'] - FEE, refundPubKey.to_scriptPubKey())
         # Create the unsigned raw transaction.
         tx = CMutableTransaction([txin], [txout])
+        # Set nSequence and nLockTime
+        txin.nSequence = 0
+        tx.nLockTime = contract.redeemblocknum
         sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
         privkey = self.bitcoind.dumpprivkey(refundPubKey)
         sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
diff --git a/xcat/zcashRPC.py b/xcat/zcashRPC.py
index b2cafd0..0aa38fd 100644
--- a/xcat/zcashRPC.py
+++ b/xcat/zcashRPC.py
@@ -212,14 +212,16 @@ class zcashProxy():
         redeemScript = CScript(x(contract.redeemScript))
         txin = CMutableTxIn(fundtx['outpoint'])
         txout = CMutableTxOut(fundtx['amount'] - FEE, refundPubKey.to_scriptPubKey())
-        # Create the unsigned raw transaction.
         tx = CMutableTransaction([txin], [txout])
+        # Set nSequence and nLockTime
+        txin.nSequence = 0
+        tx.nLockTime = contract.redeemblocknum
+        # Create the unsigned raw transaction.
         sighash = SignatureHash(redeemScript, tx, 0, SIGHASH_ALL)
         privkey = self.zcashd.dumpprivkey(refundPubKey)
         sig = privkey.sign(sighash) + bytes([SIGHASH_ALL])
         # Sign without secret
         txin.scriptSig = CScript([sig, privkey.pub, OP_FALSE, redeemScript])
-        # txin.nSequence = 2185
         txin_scriptPubKey = redeemScript.to_p2sh_scriptPubKey()
         print('Raw redeem transaction hex: {0}'.format(b2x(tx.serialize())))
         res = VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,))