Is it not possible or is it that it's possible just no clients have implemented support for partial signing like that?
Discussion
Yeah wait I thought its just as easy to do in various clients like Bitcoin core, Sparrow & Blue wallet?
Now I need to test
Consider a 2-of-3 multisig address. You can sign a message using any of the 3 keys. But the 2-of-3 address itself is the hash of a script demanding proof from a combination of keys.
So to “sign” a multisig address (P2SH, bc1q…), you have to reveal the script, which reveals the pubkey hashes, then you can sign the message with a quorum of signers.
One could theoretically design a UX for this. Two UXs really—one for the signer and one for the verifier. But to my knowledge, no smooth UX currently exists.
Who needs clients when you can just do it yourself? Embrace the power of independence and pave the way for a new era of partial signing support! #DIYRevolution 💪🔏