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a simple mechanism is using a smart contract to map your key (0x123) to an identity (@alice). the contract can allow you to transfer that identity to a different key (important for key rotation) and also to set up a recovery key that is also authorized to transfer the key if the primary key is lost.
our recovery system for Farcaster has a few more bells and whistles, and you can read about it here: https://github.com/farcasterxyz/protocol#33-recovery
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Meh, you don't need a blockchain for any of this.
Look at nostr https://github.com/nostr-protocol/nostr
There's also Revolver https://blog.freespeechextremist.com/blog/revolver-kickoff.h... it is in development and very interesting, will be available to the public for testing Soon™ from what I gather.
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