It requires to trust that the mint is NOT colluding with the npub, but still I can see it being useful!
It's conceptually similar, to waxwing (nprofile…h6x5)'s zero knowledge proof of utxo ownership.
quotingI made a cashu bond demo, people could lock ecash into their npub as a way to make your npub more acceptable. I really don't know if this could be useful.
nevent1q…6lrv
pippellia (npub176p…vgup)