Disguise a Nostr event, ask the server to blindly sign, then unblind & post!

Schnorr signatures let a signer prove they signed a message using their secret key. Blind signatures take this a step further -- you can sign a message without ever knowing the contents of what you are signing.

A user disguises their message, has the server sign the disguised message, then unblinds the result -- producing a valid signature that the server can't link back to the message it signed.

This is powerful for privacy: a server can act as an authority while remaining blind to the contents of the data it is authorizing.