#bitcoin-wizards on 2018-06-11 — 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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04:35 <domain> hey guys, was wondering how valuable a domain like coinmarkets.com is

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11:08 <adlai> domain: wrong channel, and i doubt #bitcoin is the right one either.

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13:50 <kanzure> "Practical constant-size ring signature" https://link.springer.com/article/10.1007/s11390-018-1838-z

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15:00 <mesquka> Hello

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15:01 <mesquka> I'm trying to dump the Bitcoin UTXO to CSV at a given block height for some chainalysis stuff.

15:02 <mesquka> Any help would be appreciated

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15:08 <kanzure> can you leak chainalysis's source code?

15:08 <kanzure> you would be doing a great service to the world

15:10 <mesquka> lol no, I don't work for chainalysis

15:10 <mesquka> I'm trying to do some chain analysis myself

15:11 <mesquka> I would if I had access though

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19:15 <waxwing> kanzure, huh i only just realised we talked about that ring sig in here before, about 1 mth ago i think.

19:18 <waxwing> somebody called a87ry5 linked it and you posted this link (i presume you'd copied it or something): http://diyhpl.us/~bryan/papers2/bitcoin/Practical%20constant-size%20ring%20signature.pdf

19:23 <waxwing> (and andytoshi pointed out that it states it needs a TTP for the accumulator, top p536)

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21:22 <waxwing> so if i grok correctly, musig with 2 rounds where you start by sharing R and then when shared, share sigs, is not provably secure according to 417.pdf because (ELI5 territory) since all signers haven't committed their Rs in advance of revealing, the reduction in the security proof (programming the RO) doesn't work. or something.

21:23 <waxwing> so switching to 3 round where you commit to R before reveal makes the security proof sound. is this basically it sipa ?

21:23 <waxwing> (or anyone around here who knows)

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21:23 <waxwing> and, in practice, is it fair to say that isn't a huge deal? i guess it really depends on what practical model of interactivity we imagine.

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22:04 <andytoshi> waxwing: yep, correct on all counts

22:04 <andytoshi> not a big deal but it's pretty annoying, esp given that the scheme is Obviously Secure without the extra round

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