But is there federation between instances of this and the official signal servers?

	▲	loeg a few seconds ago \| parent \| next [-]
		Well, obviously not. Official Signal does not support federation.
	▲	tptacek 7 minutes ago \| parent \| prev [-]
		There will likely never be federation between Signal's official servers and any other servers. Signal introduces privacy features semiregularly; we all saw with Matrix how difficult that is in a highly-federated environment.