--- Log opened Wed Oct 11 00:00:52 2023
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06:34 < instagibbs> [bitcoin-dev] Proposed BIP for MuSig2 PSBT Fields https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-October/021988.html musig2 fields
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10:36 < Ademan> achow101: oh no, I sat on my proposal too long! I did not (and do not) consider this ready to share on the list, but I have a partial rust implementation based on rust-bitcoin, and have (poorly) documented it https://github.com/Ademan/rust-musig-psbt/blob/wip/bip-0000.mediawiki
10:36 < Ademan> I at least consider this a concept ack though ;-)
10:40 < Ademan> I will have to think about the places where our proposals differ but I would tend heavily to defer to you haha. I'd love to contribute something to the effort, even if it's just adapting my implementation to your draft.
10:43 < Ademan> actually the README probably is a better summary of the design at this point https://github.com/Ademan/rust-musig-psbt/tree/wip#readme
10:45 < Ademan> I was starting to tidy up this week, but I'd like to contribute something if I can so I'm sharing a bit early
10:53 < Ademan> I wanted to use my little cli tool to sign a signet tx before I announced it heh
11:01 < Ademan> plus the tests are anemic
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11:14 < Ademan> PSBT_IN_MUSIG2_PUB_NONCE the tap leaf hash is optional right? partial sig is clear on that
11:16 < achow101> ah yes, good point
11:16 < achow101> made the change
11:17 < achow101> there's no implementation yet, so the proposed fields might be insufficient
11:17 < achow101> it's pretty much just what I think should work
11:18 < Ademan> it's very close, but a superset, of what I'm doing (I limited myself to keyspends only to keep things managable for the peanut brain)
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11:19 < Ademan> I did separate PSBT_IN_MUSIG2_PARTICPANT_PUBKEYS out into a series of index,pubkey key/values instead of one single key/value with an array value. My half-baked reasoning was that if you were running a protocol where you might need to evict a participant it would be slightly easier to update the psbt *shrug*
11:20 < Ademan> oh, PSBT_OUT_MUSIG2_PARTICPANT_PUBKEYS is misnamed PSBT_IN_MUSIG2_PARTICPANT_PUBKEYS
11:20 < achow101> oops
11:20 < achow101> spelling is my worst enemy
11:22 < Ademan> I would definitely like to see PSBT_OUT_MUSIG2_PARTICPANT_PUBKEYS be individual key/value pairs so that psbts can be passed around to aggregate, but I can't remember if that is valid in v0, since you wouldn't have a witness script until you're done aggregating
11:23 < achow101> setting up the musig is considered out of scope
11:23 < achow101> by the time you're spending, the participants have to already be known since the aggregate key was created in order to receive in the first place
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11:31 < Ademan> my use case is combining several parties' UTXOs into a single musig output and signing a refund and an "execute" transaction from there. I'm imagining PSBT_OUT_MUSIG2_PARTICPANT_PUBKEYS being used to coordinate that musig output. Since the first transaction isnt' signed or broadcast until the two dependent transactions are signed, I expect there will be a lot of shuffling around of participants in 
11:31 < Ademan> the musig. I was thinking it would be nice to be able to use the psbt itself to coordinate that, I suppose that's not the real purpose you had in mind for PSBT_OUT_MUSIG2_PARTICPANT_PUBKEYS (more for validation?)
11:33 < Ademan> (and also fair enough if you still think that should be out of scope)
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11:38 < achow101> that sounds like you should have separate fields for specifically that use case
11:39 < achow101> this is more generically "i have an output with musig, how do i spend it"
11:47 < Ademan> "To determine whether a signer is a participant in the MuSig2 aggregate key, the signer should first ~~check~~ look at all PSBT_IN_MUSIG2_PARTICIPANT_PUBKEYS"
11:48 < Ademan> would you rather a PR for the nit picking?
11:49 < Ademan> we'll see if I find any more nits anyway
11:55 < Ademan> The second paragraph of Signer seems to imply that generating multiple nonces is a problem, isn't it reusing a nonce?
11:55 < Ademan> Should that paragraph also say that the signer should add its pub nonce if it's already generated but missing?
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13:32 < achow101> it's not totally clear to me which things with nonces are problematic
13:32 < achow101> so that section could use some help from cryptogrphaers
13:44 < instagibbs> I wouldn't put too much detail into how/when/why they're added as that's a sensitive wallet detail, but I'd have to give it more thought likely 
13:45 < Ademan> some kind of explicit caution about never producing two partial signatures with the same priv/pub nonce is warranted imho
13:46 < instagibbs> "Please see BIP327 for best practices on nonce generation and usage"
13:48 < Ademan> I'd strengthen it to something like "Improper nonce usage can compromise private keys. Please see BIP327 for best practices on nonce generation and usage."
13:48 < Ademan> I'm an expert in being an idiot, the brighter the warning is the better ;-)
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