TODO add docstring

def add_data_blob(self, rawtx, hexdata, dust_limit=common.DUST_LIMIT):
        """TODO add docstring"""
        tx = deserialize.tx(rawtx)
        data = deserialize.binary(hexdata)
        tx = control.add_data_blob(tx, data, dust_limit=dust_limit)
        return serialize.tx(tx)