sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<waxwing_>
sipa, very good point to distinguish commitment soundness from spend-ability ... i was of the opinion that you just want to get some clear statement about the former being negligible enough, and ignore the latter (like, if i can't collide it, no need to worry about what properties a collision has)
<waxwing_>
sanket1729, re: "would output H(P_i || S'')", presumably you mean H(P_i || S'')G , also a bit confused on notation, is S'' a pre-chosen script you want to forge on? why is the first (pre-existing) Q = P' + H(P'||S') with ' ? probably doesn't matter, just checking
<waxwing_>
re: hiding property of commitment, that's a good point also, i felt like it should be ignored, in the sense that i thought we had to be sure that taproot script path was secure independent of attacker's knowledge of P, S.
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<sipa>
waxwing_: well we want taproot for privacy, in that all outputs should look indistinguishable
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<sipa>
it's easy to prove that is the case when either the internal pubkey or the script are sufficiently random/unknown to the attacker
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