--- Log opened Wed Feb 08 00:00:38 2023
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08:03 < michaelfolkson> I'm confused. You want to redesign Taproot to not allow the same leaf script on multiple levels of the Taproot tree. https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2023-February/021458.html
08:04 < michaelfolkson> Let's say you have leaf script A on level 1 of the tree (on the left side of the tree). Then you repeat leaf script A along with leaf script B, C and D on the right side of the tree
08:06 < michaelfolkson> How does "signing the entire tapbranch instead of the tapleaf." stop leaf script A from being repeated on the right hand side of the tree?
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08:23 < _aj_> i think he means signing the entire merkle path, rather than just the leaf
08:30 < michaelfolkson> _aj_: Thanks, I don't even think that would work. I guess a better example would be having leaf script A and B on Level 2 of the tree (on the left side). Then repeating A along with leaf script C, D and E on Level 3 of the tree (on the right side)
08:31 < michaelfolkson> If you spend A from say the left side you don't ever reveal that A also existed on the right side
08:31 < michaelfolkson> Or vice versa. If you spend A from the right side you don't ever reveal that A also existed on the left side
08:32 < _aj_> (AB) ((AC) (DE))  -- then A on the left has the path #A #B #ACDE while A on the right has path #A #C #DE #AB so would result in two different commitments
08:39 < michaelfolkson> Right, these paths only get revealed at spending time. And if you spent the A on the left you wouldn't be forced to reveal that A ever existed on the right too
08:42 < michaelfolkson> You could force the revealing of the hash of every leaf in the tree at spending time to prevent repeated A's but that would be very inefficient
08:44 < _aj_> you don't have to reveal anything additional
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08:53 < michaelfolkson> I don't get it then. I want to stop A being spent from if A is repeated in the tree anywhere else. A is spent from the left of the tree, I never find out A was also repeated on the right of the tree because the only hash I see is #ACDE
08:54 < michaelfolkson> I don't ever see #A existed on the right side of the tree
08:55 < michaelfolkson> Hence how can my hypothetical new Taproot rules identify A was on both sides of the tree and hence stop it being spent from a leaf script A
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17:52 < ghost43> michaelfolkson: if the merkle path to the tapleaf was signed, it would not be interesting whether there is a duplicate tapleaf in the tree. the issue is that as the tapleaf path is not signed, if the tapleaf is duplicated, anyone with knowledge of the taptree can "rebind" the spend to refer to the other matching tapleaf. it is sort of a malleability. if the path to the leaf was signed, this would not be possible.
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--- Log closed Thu Feb 09 00:00:35 2023