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12:08 < achow101> Ademan_: was re-reviewing the psbt bip, and it occurred to me that the aggregate key should probably be the full key rather than xonly. do you have any thoughts on that, as the only person I know who is implementing this currently?
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14:50 < Ademan> achow101: I'll have to think about that a bit, Ive paged a lot of the musig stuff out of memory lol. my instinct is xonly is fine (that's what's generally used throughout the libsecp256k1-zkp API and will be natural to the majority of implementors who are probably using libsecp) ESPECIALLY since it's only used as a search key. But I'll give it a bit of thought.
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14:51 < achow101> It's necessary to do any bip32 derivation from an aggregate key, and I'm expecting derivation to be something that happens a lot
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14:57 < Ademan> achow101: where are you referring to the agg pubkey? at least in my implementation I never just take the agg pk from the psbt, I either have it already or calculate it from PSBT_IN_MUSIG2_PARTICIPANT_PUBKEYS.
14:58 < achow101> it's used in the participant pubkeys and the partial sigs as an identifier
15:00 < achow101> but when the tx has a derived key, then how do you know that it was derived from an aggregate key? the way that psbt suggests you do this is by looking at the fingerprint in psbt_in_tap_bip32_derivation and comparing that to known fingerprints, possibly of things already in the psbt
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15:00 < achow101> but in order to have the fingerprint of the aggregate pubkey, it can't be xonly
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15:07 < Ademan> hrm, you're probably right then. I mean you could still recover the full pubkey by aggregating the participant pubkeys yourself, but that's obviously undesirable.
15:08 < Ademan> My usage comes with so much context I always know exactly what keys I'm signing for ahead of time. Wish I had more time to flesh it out for other uses, suppose I can at least file some bugs for myself...
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16:22 < _aj_> achow101: i'm not sure, i thought the idea was to do full pubkeys and only go x-only when doing the final signature
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19:24 < achow101> _aj_: right, so having the full pubkey in the psbt would follow
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--- Log closed Tue Jan 16 00:00:31 2024