In a way social security and all-caps name are that, without the privacy of course
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Well, it would not at all be private since notes are public. People would be able to see metadata like you used Uber at 5.27 p.m. But they wouldn't associate a name with it unless of course you doxxed yourself which would be all to easy to do.
Change to yer pgp public key fingerprint instead, and the public will be *verifiably* public and the private 100% private unless you are a dumbass that generates a < 4096 bit key.
You know what? I wonder if it would be possible to request a legal name change and change my name to my npub.
It's precisely like that except you never ever get the private key.