It would be good for nostr to support multisig keys.
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Discussion
Since nostr uses Schnorr signatures, it already supports n-of-n multisig. Though in this case I guess you're thinking of something where not all users need to sign?
Yes, I was thinking any nsec owner can post without the others signing. I guess we all own the private key then & don't need to be fancy? (Thinking out loud here)
But if all users want the post to pass muster, then they all need to sign & that's a different option, hmmm, which is better...