nostr:npub1xtscya34g58tk0z605fvr788k263gsu6cy9x0mhnm87echrgufzsevkk5s was pondering the question about enabling finding friends on nostr through phone numbers, and eventually realised it wasn't enough entropy to be secure

you can take phone number, name, birthday, address, bank account number, and still not even have 1/1^128 th of the security of a 256 bit elliptic curve key