but that's what I mean, if you say "I publish these event kind in relay A" then you can scope the chain to that relay and have a locally enforced chain that works (this is why I wanted to add the `relay` tag to the NIP-60 wallet event) because it makes the state of a known number of relays authoritative.

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