#bitcoin-wizards on 2017-12-12 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 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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17:21 <nsh> https://getmonero.org/2017/12/07/Monero-Compatible-Bulletproofs.html

17:21 <nsh> ( https://github.com/monero-project/monero/pull/2883 )

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17:24 <nsh> pretty skinny commit considering the cumulative effect... 11 changed files with 195 additions and 64 deletions.

17:25 <kanzure> do they use secp256k1-zkp repository?

17:25 <andytoshi> no, monero uses ed25519

17:25 <kanzure> no, right, different curve

17:26 <nsh> oh no, this is the full merge https://github.com/monero-project/monero/commit/782a84f7b490baa10afef94dd6954d6ab50d020b

17:26 <nsh> (25 changed files with 1,911 additions and 95 deletions.)

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17:35 <maaku> sipa: I went looking for the real reason for BIP 66 (the security vulnerability it fixed), and was surprised to find it not documented in BIP 66. Perhaps it would be appropriate to update the BIP after the fact?

17:36 <maaku> > This is, approximately, an 80% reduction in transaction size, which then translates to an 80% reduction in fees as well <-- fluffypony you're not weighting by computation?

17:37 <maaku> > Further, our initial testing shows that the time to verify a bulletproof is lower than for the existing range proofs, meaning speedier blockchain validation.

17:37 <maaku> <-- per rangeproof, yes, not per-byte

17:38 <maaku> oh sorry that is dealt with that later in the blog post

17:39 <andytoshi> i had the same impression, it might be worth rewording it somehow. perhaps start the sentence with "we have to move away from a byte-proportional transaction weight" or something

17:42 <fluffypony> if there's a better way to phrase feel free to submit a PR directly or open an issue

17:42 <fluffypony> https://github.com/monero-project/monero-site/blob/master/_posts/2017-12-07-Monero-Compatible-Bulletproofs.md

17:42 <maaku> It's probably appropriate for everyone except the 5-ish people that already understand bulletproofs. Someone not knowing the math wouldn't have been like "wait, isn't the verification time non-linear?!"

17:42 <fluffypony> lol

17:44 <maaku> similarly I was disappointed there wasn't a technical description of how bulletproofs had to be adopted to be compatible with ringCT, but also the wrong audience for that

17:44 <andytoshi> maaku: right now they only use the bulletproof rangeproofs, which are independent of ringCT

17:44 <andytoshi> i believe ruffCT is a bulletproof-like (also bootle inspired) replacement of ringCT

17:45 <maaku> ah

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