Thread - Hyper

If a relay published a white list as a bloom filter, is it possible for clients to prove their user is inside of the list without revealing the pubkey to the relay? It would be nice to evolve nip42 auth in a way that doesn't require exposing the user signing in.

Replies (4)

il_lost_ 🛡️ 6 hours ago

I had an idea to ask the relays for an id and the answers from Alice Bob and Carol is something like that possible?

SatsAndSports 5 hours ago

In cashu, you can use your public key to get an "Auth token", but it's blinded Therefore, when you log in later, the server can't link the token to any particular pubkey And, if the user requests multiple tokens in advance and uses a separate token for each session, then those sessions can't be linked to each other

NUT-22 - Blind authentication - Cashu NUTs Specifications

ben 🛡️ 4 hours ago

a bloom filter would allow you to assert a pk is definitely NOT in the set. you cant prove it’s in the set due to false positives

Max 🛡️ 4 mins ago

Yes.