docs: 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")