I just spent 15 minutes with perplexity ai trying to figure out if SeedXOR can be applied to nsec keys, and it seems very plausible. Not sure if this is helpful or even in the right direction.
Is it possible to take an nsec you already have and split it into 3 somehow, give one shard to each server and then they somehow collaborate to make a signature? I think you can't do MuSig2 for that, but maybe some other, simpler (less safe?) algorithm? I've asked nostr:npub1vadcfln4ugt2h9ruwsuwu5vu5am4xaka7pw6m7axy79aqyhp6u5q9knuu7 this once but he never answered.
