Let’s start here: https://github.com/nostr-protocol/nips/blob/master/57.md

No, Private is between two people. Both know who is who. No tracing needed

Anon, you use new key but you still pass your relays to propagate the zap note. If I am receiving the anon zap I (who has his own zapper with logs) can see relays and random key.

🐶🐾🫡