def check_script(vouts):
        """
        Looks into the vouts list of a transaction
        and returns the ``op_return`` if one exists.

        Args;
            vouts (list): List of outputs of a transaction.

        Returns:
            str: String representation of the ``op_return``.

        Raises:
            Exception: If no ``vout`` having a supported
                verb (:attr:`supported_actions`) is found.

        """
        for vout in [v for v in vouts[::-1] if v['hex'].startswith('6a')]:
            verb = BlockchainSpider.decode_op_return(vout['hex'])
            action = Spoolverb.from_verb(verb).action
            if action in Spoolverb.supported_actions:
                return verb
        raise Exception("Invalid ascribe transaction")
Looks into the vouts list of a transaction
        and returns the ``op_return`` if one exists.

        Args;
            vouts (list): List of outputs of a transaction.

        Returns:
            str: String representation of the ``op_return``.

        Raises:
            Exception: If no ``vout`` having a supported
                verb (:attr:`supported_actions`) is found.