forking across relays is what you mean I suppose? in that case, I can resolve the fork with precision. I just need the relay to tell me I can or can't write this data. There is no other way.

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but how would the relay know if it can't know the final state? it can only allow/reject locally, unknowingly allowing a fork
all the relay needs to do is what I said above, it doesn't need to do anything else. Maybe I'm not sure what you meant