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This is literally a degenerate CRDT. Central server for tie-breaking goes back to Google Wave.

Any algorithm that uses a central server as a tie-breaker could easily be replaced by one where client ids are used for the tie-breaker.

If you used UUIDv7 you get time-ordered UUID and could use that for a tie breaker.

Don’t you have to be confident the clocks are sufficiently synced across the system?

And you know.. simultaneity is not a thing in reality...

It's even less of a thing in distributed systems, but you have to pick something to show the user and clocks are often good enough :D

I miss Wave a lot, very quirky in a good way imo. We ran a few D&D games over it. RIP