diff --git a/pybtc/blockchain.py b/pybtc/blockchain.py
index 2d59f6f..ff731c9 100644
--- a/pybtc/blockchain.py
+++ b/pybtc/blockchain.py
@@ -335,7 +335,7 @@ class Transaction():
         return 'Transaction object [%s] [%s]'% (hexlify(self.hash[::-1]),id(self))
 
 
-    def serialize(self, segwit = False, hex = False):
+    def serialize(self, segwit = True, hex = False):
         version = self.version.to_bytes(4,'little')
         ninputs = to_var_int(self.tx_in_count)
         inputs = []
@@ -377,7 +377,9 @@ class Transaction():
         scriptCode += b'\x14' + pubkey_hash160 + OPCODE["OP_EQUALVERIFY"] + OPCODE["OP_CHECKSIG"]
         self.tx_in[input_index].sig_script = Script(b'\x16\x00\x14' + pubkey_hash160) # P2WPKHredeemScript
         sighash = self.sighash_segwit(sighash_type, input_index, scriptCode, amount)
+        print(sighash)
         signature = sign_message(sighash, private_key) + sighash_type.to_bytes(1,'little')
+        print(signature)
         self.witness[input_index] = Witness([signature, pubkey])
         self.recalculate_txid()