You might be thinking of BitID, which tightly couples payment addresses to identity: https://github.com/bitid/bitid https://github.com/bitid/bitid – BitAuth doe

You might be thinking of BitID, which tightly couples payment addresses to identity: https://github.com/bitid/bitid https://github.com/bitid/bitid – BitAuth does not use Bitcoin keypairs. We created BitAuth as a way to avoid coupling payments with identity, which is why the keypairs are independent and include a different prefix (0x02).