One that’s tied to your main?
Discussion
BIp85 style is a good start, some ratchet would be even better
You may like this. nostr:nprofile1qqsrqe24lmjyxdvzkvhk63h3rdjymgecjev4q95f8476rrr4l4la7yspzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtcpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtcpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhs7getup has a solution that uses BIP-85 and proofs for making multiple for-purpose identities that can attest to each other's reputation, without revealing the association