I don’t know of a library, but it’s also not too difficult to roll from scratch. The only crypto primitive is the hash function, for which one could use any off-the-shelf SHA256 implementation.
nostr:npub1mxrssnzg8y9zjr6a9g6xqwhxfa23xlvmftluakxqatsrp6ez9gjssu0htc , nostr:npub1vadcfln4ugt2h9ruwsuwu5vu5am4xaka7pw6m7axy79aqyhp6u5q9knuu7 : do you know any library that can do this sort of challenge response protocol? "Proof of storage" is probably a good way to describe it, but I'm not sure.
I'd like to build something on top, but would very much prefer if the crypto primitives are already taken care of.
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