[zzzcpan]

With CRDTs log entries can be purged once they synchronize with everyone, no need to keep them just in case. Although it's rather implementation specific.

[ryuuseijin]

Thanks, I did address that when I said you can solve it if you know all actors in a n-n system, but I should have been clearer by pointing out the solution, which is (as you already said) every known actor acknowledging it.

In an unbounded n-n system I still don't see a solution.