--- Log opened Fri Jul 28 00:00:12 2023
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06:28 < instagibbs> 255 times out of 256 times it works every time
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14:42 < ademan[m]> I realized my ad-hoc protocol for building transactions with musig could probably be more extensible (enables a use case I'm planning on anyway) if I just use PSBTs, but I'm not sure what that would look like...
14:44 < ademan[m]> I have a participant and a coordinator role. The participant proposes a transaction which funds a taproot keypath-only address which is a 2-of-2 musig between the coordinator and participant. How would I "mark" that output as the one the coordinator and participant are both signing for? How would I (or should I?) permit the participant and coordinator to attach their public nonces and partial signatures to that output?
14:50 < ademan[m]> whoops, kind of smashed the two steps together in my description there. participant creates an unsigned tx to this musig output, then the coordinator and participant spend that to a time locked refund tx, as well as an "execution" tx. Obviously the signing for musig occurs in these steps, not in the first tx
14:52 < ademan[m]> so the nonces and partial signatures would be on the input side of the refund and execute transactions naturally
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14:55 < ademan[m]> my current protocol works fine for 1 participant 1 coordinator, but aggregating ends up being much much lighter weight on chain so I'd like to support n participants and 1 coordinator, and I'd need to make major changes to support that, so I think just switching to PSBTs now will make the protocol mostly the same in either case. (If I can figure out how to best represent the necessary context in the PSBT)
15:02 < ademan[m]> I guess the input of concern can be identified with PSBT_IN_TAP_INTERNAL_KEY does that seem reasonable? (signers can obviously match that against their own aggregate public keys) I suppose I have to use proprietary keys for the public nonces and partial signatures, does that even make sense to do, or should I just stick that data in my json payload instead?
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--- Log closed Sat Jul 29 00:00:13 2023