--- Log opened Fri Aug 04 00:00:18 2023
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15:04 < stevenroose> I don't think the taproot sighash is an improvement compared to the segwit one. It tries to be smarter but then it makes the internal structure very dependent on the sighash flags. While the segwit one keeps the structure and just puts zero bytes in places where there is nothing to commit.
15:05 < stevenroose> Also, the lack of explicit commitment to the prevout is annoying. There is the prevouts hash and a input index, but that complicates things too.
15:05 < stevenroose> Just some points of (obviously too late) feedback, but I'll try be around reviewing when we ever get to a new sighash construction :)
15:08 < stevenroose> I had some fun implementing double spend detection in Liquid script (Bitcoin script + CHECKSIGFROMSTACK), which was remarkably easy for segwit: https://github.com/stevenroose/doubletake/blob/master/docs/design.md
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16:10 < andytoshi> interesting observation that we could've been "generic over the sighash flags"
16:11 < andytoshi> i don't think it ever crossed our minds that somebody would want to support multiple flags at once for something like this
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18:51 < stevenroose> andytoshi: I imagine haha, yeah segwit will always serialize the same structure of data, as in length of bytes etc, which is kinda nice. I think for taproot, I can do a path for ANYONECANSPEND and a path for not ANYONECANSPEND (and when it comes to double spends, I think it'd be fair to just outlaw ANYONECANSPEND, so any sighash using ANYONECANSPEND could be considered a violation of a
18:51 < stevenroose> double spend bond, IMO, thoughts?)
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--- Log closed Sat Aug 05 00:00:19 2023