def GetScriptHashesForVerifying(self):
        """
        Get the script hash used for verification.

        Raises:
            Exception: if the verification script is invalid, or no header could be retrieved from the Blockchain.

        Returns:
            list: with a single UInt160 representing the next consensus node.
        """
        # if this is the genesis block, we dont have a prev hash!
        if self.PrevHash.Data == bytearray(32):
            #            logger.info("verificiation script %s"  %(self.Script.ToJson()))
            if type(self.Script.VerificationScript) is bytes:
                return [bytearray(self.Script.VerificationScript)]
            elif type(self.Script.VerificationScript) is bytearray:
                return [self.Script.VerificationScript]
            else:
                raise Exception('Invalid Verification script')

        prev_header = GetBlockchain().GetHeader(self.PrevHash.ToBytes())
        if prev_header is None:
            raise Exception('Invalid operation')
        return [prev_header.NextConsensus]
Get the script hash used for verification.

        Raises:
            Exception: if the verification script is invalid, or no header could be retrieved from the Blockchain.

        Returns:
            list: with a single UInt160 representing the next consensus node.