--- Log opened Sun Feb 11 00:00:01 2024
--- Day changed Sun Feb 11 2024
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14:44 < Ademan_> achow101: am I stupid? (yes) can't a pubkey be both taproot internal key AND be used in a script? It seems like this can't be expressed with PSBT_IN_TAP_BIP32_DERIVATION
14:45 < Ademan_> used in tap scripts*
14:46 < achow101> yes, but if you have any tapscripts, it's fairly straightforward to check what the internal key is
14:49 < Ademan_> so basically "if there's a PSBT_IN_TAP_BIP32_DERIVATION belonging to you, also check if the derived key matches the internal key in addition to any tap script leaves" ?
14:50 < Ademan_> I suppose it's kind of weird for a signer to receive a PSBT where you're signing for the script path and the key path, even if that's what's possible
14:56 < achow101> if you can sign for the key path... why no just do that? it's unencumbered by anything else
15:01 < _aj_> achow101: if it's a multisig, maybe you want it to be encumbered by something else (that's the case for eltoo/ln-symmetry)
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15:08 < achow101> _aj_: but it wouldn't be both the internal key and be in a script
15:08 < Ademan_> _aj_: since there's a few different versions of ln-symmetry can you spell it out a bit more for me? with APO don't you just sign for the key path for state updates? with CTV+IK+CSFS you don't actually want to use the key path to begin with, right?
15:09 < Ademan_> (point being in either case, the signer is not going to be interested in signing for BOTH a script path and a key path. *if* they can use the key path, they would sign for only that and be done?)
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15:16 < _aj_> achow101: with APO, the pubkey is "OP_1" which gives the IPK as pubkey?
15:17 < _aj_> Ademan_: APO isn't available for key path spends at all, that would be a hard fork or a new witness version
15:18 < _aj_> (the point of eltoo is that you want to use "x CLTV <pk> CHECKSIG" so that only a later signature (committing to a higher nLockTime) can be used)
15:21 < _aj_> Ademan_: anytime you're signing with the IPK you "can" sign for the keypath, if the app is instructing the signer what to sign only via psbt then i think they need some way to specify? but just the fact that you've specified a script to sign for should be enough?
15:29 < achow101> you can specify a sighash type to use
15:31 < Ademan_> _aj_: thanks, ah right of course. My context is this musig-psbt library I'm working on so your multisig point was very relevant. You *wouldn't* want to sign for the key path, even though you *could* in ln-symmetry.
15:36 < Ademan_> achow101: just realized that PSBT_IN_TAP_BIP32_DERIVATION gives you an xonly pubkey, but participants in a musig aggregate key are specified as compressed pubkeys, so you can't provide the derivation path to an odd pubkey, maybe this is another argument in favor of disallowing musig(A/1/2, B/2/3) and only allow deriving from the aggregate or am I missing something (again)?
15:39 < achow101> yeah.. you can just make the participant keys xonly for the purposes of looking up derivation paths
15:40 < achow101> i.e. just ignore that evenness byte
15:45 < Ademan_> feels kinda gross, but it's unambiguous in any sane scenario
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15:47 < achow101> i think we're starting to regret doing xonly keys
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--- Log closed Mon Feb 12 00:00:52 2024