If you want the attestation to be technically meaningful here are few things that have to happen (and that do happen on Farcaster and elsewhere):

Everyone who followed your old key before timestamp x (time of theft) now follows your new key, automatic.

DMs sent to your old key can be read using your new key (and no longer read using your old key)

Posts from your old key show with your new avatar and handle to anyone browsing.

And 50 other things.

How are these things to happen Nostr? If what you’re suggesting is just a nostr-native alternative to an adding your NIP05 to your new key then we already know what a non-solution that is. And if you want those things above to happen then you don't need a blockchain per se but you need a hard fork.

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oh, that's where our miscommunication is. why did this take so long to get to?

i don't require that whole list of stuff. i just want to know with some confidence if someone has a new npub.

Ah okay, fair enough, though I'm not sure that's so much of a value add. The real issue is that normies will never accept a network where if you lose control of your account the best you can do is let everyone know you're starting again completely from scratch at some new account.

the expectation that you can somehow sort things out after a hack and not lose all of your history is far too engrained.