code: def verify_transaction(signed_hextx, op_return_value):
      
      logging.info('verifying op_return value for transaction')
      op_return_hash = signed_hextx[-72:-8]
      result = (op_return_value == op_return_hash)
      if not result:
          error_message = 'There was a problem verifying the transaction'
          raise UnverifiedTransactionError(error_message)
      logging.info('verified OP_RETURN')
docs: Verify OP_RETURN field in transaction
      :param signed_hextx:
      :param op_return_value:
      :return: