This is pretty cool (schnorr key aggregation is black magic), but what applications do you think could benefit from relaying over Nostr? If you know the person you're joining a multisig with, couldn't you do the communication over any encrypted channel?
Could this be used for some sort of mixing service? For example all users in a pool deposit into an n-of-n multisig and at some point in the future start withdrawing (not sure if this would yield privacy benefits)