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21:03 < jeremyrubin> from the CTV WG, we're looking at how Eltoo works and curious how pinning works with APOAS
21:03 < jeremyrubin> As far as we understand, with APOAS, anyone can add inputs in all sighash modes
21:04 < jeremyrubin> this is confirmed by http://yakshaver.org/2021/07/26/first.html
21:04 < jeremyrubin> If either sighash APO or APOAS are used, then the signature behaves as if SIGHASH_ANYONECANPAY is used and allows additional inputs to be added to the transaction without invalidating the signature used for the input signed with these new sighashes. This feature is used by the eltoo transactions to add an additional input for transaction fees.
21:04 < jeremyrubin> if this is the case, then how are eltoo channel updates immune to "fat witness" pinning attacks?
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21:25 < _aj_> i don't think they are immune to pinning attacks
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22:32 < jeremyrubin> 😬
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23:39 < realtbast[m]> Yes, eltoo doesn't improve anything AFAIK regarding pinning. It does have a lot of other improvements though ;)
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23:50 < jeremyrubin> hmmmm
23:51 < jeremyrubin> it seems that this type of pinning, where you can't even stop someone froma dding an input, is concretely worse than the status quo
23:53 < realtbast[m]> I don't understand what you're referring to. Anyone broadcasting a tx would still sign with SIGHASH_ALL, right?
23:54 < jeremyrubin> what does sighash_all sign?
23:54 < jeremyrubin> https://rubin.io/bitcoin/2021/07/09/bip-118-sighash-chart/
23:54 < jeremyrubin> according to my chart, it does not sign the prevouts
23:59 < jeremyrubin> this means anyone can "stuff" in any number of extra inputs into your txn
23:59 < realtbast[m]> I mean `sighash_all`, not `APO | sighash_all`...? Or am I missing something?
--- Log closed Fri Apr 29 00:00:05 2022