code: def start(cls, originator_id, quorum_size, network_uid):
          
          assert isinstance(quorum_size, int), "Not an integer: {}".format(quorum_size)
          return cls.__create__(
              event_class=cls.Started,
              originator_id=originator_id,
              quorum_size=quorum_size,
              network_uid=network_uid
          )
docs: Factory method that returns a new Paxos aggregate.