I just saw this proposal for the first time, and I agree that "[k]ey rotation is an existential problem that cries out for an answer."
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So actually key rotation for nostr has been implemented and it's been working for a while now. You can go to the "Explore" tab at
to interact with some cold storage identities, or use the "Toy Identity" wizard to make a trial identity of your own.
Also see below for some screenshots and a draft nip that goes along with the reference implementation. ๐
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