docs: def send(self, wifs, txouts, change_address=None, lock_time=0, fee=10000):
          """TODO add doc string"""
          # FIXME test!!
          rawtx = self.create_tx(txouts=txouts, lock_time=lock_time)
          rawtx = self.add_inputs(rawtx, wifs, change_address=change_address,
                                  fee=fee)
          return self.publish(rawtx)