Comment by red_admiral

AFAIK, it's server-based rather than p2p for DE, but the way it works is all clients/servers simulate the world in lockstep and hold a full copy of the state. That's what makes map hacks possible.

You don't need anything paxos-like for this, the game desyncs and stops if any machine messes up but you can usually restore from a save point in that case.