I think Nostr App notifications when your meta events are updated from another source could be useful.

Profile to detect general changes, but perhaps also lud/zap payment details too.

Maybe notifications for contact list could be noisy - but maybe a toggle.

And for relay 10002 events, it could tell you the changes.

Then if anything unexpected, you select an old event saved locally in app and then republish a new event with the same content.

And if your zap details changed, likely your account is compromised.

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I had considered this as a relay service, however I think client apps can do it well enough.

The gap being your meta changed, but published to relays you don’t read from - so it’s a blind spot. Seems like an edge case anyway.

And perhaps meta events should also have some r (relay) tags too. Then if you have a recent meta, you at least have some relays to query if a newer replacement exists.

This is all a limitation because we don’t have an append only log or concept of HEAD in Nostr - which is mostly awesome, we just need to herd the places it’s less friendly.