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@ salvatoshi
2025-04-26 08:35:16
Yep, you can definitely have multiple invisible cosigners!
For example, one could be self-hosted if you have an always-online machine.
Of course, since MuSig2 is an AND of all the cosigners, having more increases the chance of at least one of them failing, so in practice I expect a single cosigner managed by a professional entity to be a very popular option. In that direction, an interesting thing to explore is: how private can this be? It should be possible to combine MuSig2 with Schnorr blind signing, so that the cosigner doesn't necessarily have to learn about your transactions, while still being able to check predicates in them (this paper does it for single-sig: https://eprint.iacr.org/2022/1676 but smarter people tell me it should be generalizable for MuSig/FROST).