docs: def tx_output_has_data(output, blockchain='bitcoin', **blockchain_opts):
      """
      Give a blockchain name and a tx output, determine whether or not it is a
      data-bearing script--i.e. one with data for the state engine.
  
      Return True if so
      Return False if not
      """
      if blockchain == 'bitcoin':
          return btc_tx_output_has_data(output, **blockchain_opts)
      else:
          return ValueError('Unknown blockchain "{}"'.format(blockchain))