Vernor Vinge's A Fire Upon the Deep (1992) depicts a galaxy of countless highly advanced civilizations in the far future - and describes its "net" as "the net of a million lies". However, it also depicts every message with an AI's best judgement of its reliability - for example:

>From: Sandor Arbitration Intelligence at the Zoo [A known military corporation of the High Beyond. If this is a masquerade, somebody is living dangerously.]

More examples here: https://hur.st/afutd.html (spoilers if you read more than the From lines)