Yeah but it is a weird flow, I generate key and give user the string, they then need to sign and give back to me. Would be better if the user could generate the string in their app and give me the private key along with all the other info, then there's no need for all the back and forth.
Discussion
NIP-26 is dead guys, almost no client supports it, almost no relay supports, relays that were supporting it earlier stopped supporting it
plus its trust model is borked