Method verify_input

code-ch08/tx.py:201–219

Returns whether the input has a valid signature

(self, input_index)

        return int.from_bytes(h256, 'big')

    def verify_input(self, input_index):
        '''Returns whether the input has a valid signature'''
        # get the relevant input
        tx_in = self.tx_ins[input_index]
        # grab the previous ScriptPubKey
        script_pubkey = tx_in.script_pubkey(testnet=self.testnet)
        # check to see if the ScriptPubkey is a p2sh using
        # Script.is_p2sh_script_pubkey()
            # the last cmd in a p2sh is the RedeemScript
            # prepend the length of the RedeemScript using encode_varint
            # parse the RedeemScript
        # otherwise RedeemScript is None
        # get the signature hash (z)
        # pass the RedeemScript to the sig_hash method
        z = self.sig_hash(input_index)
        # combine the current ScriptSig and the previous ScriptPubKey
        combined = tx_in.script_sig + script_pubkey
        # evaluate the combined script
        return combined.evaluate(z)

    def verify(self):
        '''Verify this transaction'''