--- Day changed Fri Apr 26 2019
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00:51 < waxwing> d3spwn, i think it kinda does actually, you would get a sync after a join but before the first one, the wallet wouldn't have the new utxo recorded. i'll have to read the code again later, i always forget this, but i believe thta's how it works.
00:52 < waxwing> belcher, i notice on the finex hack coin movement thread you mentioned the same issue with wasabi as i did on mastodon the other day. did you see my thread about that?
00:56 < gmaxwell> ?     
00:58 < waxwing> gmaxwell, i'll link you belcher's version because he said it in like 1 sentence :) https://www.reddit.com/r/Bitcoin/comments/bha10i/bitcoins_from_the_bitfinex_hack_2016_moved_today/elsepj3/
00:59 < waxwing> interesting point is that registration with the server means handing over inputs with blinded outputs. (and proof of ownership of inputs iiuc)
00:59 < waxwing> so inputs come in at step 1, and that allows bifurcation or some trick perhaps.
01:00 < waxwing> https://mastodon.social/web/statuses/101907349113411975
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01:30 < gmaxwell> I'm not really fond of the server model...
01:30 < gmaxwell> otoh, it does have varrious advantages.
01:55 < waxwing> gmaxwell, right. it's clear there are limitations, it's equally clear that the practicality makes it attractive.
03:28 < belcher> waxwing i didnt, but i think you told me about the idea in person
03:30 < belcher> i certainly didnt come up with it myself
03:30 < qubenix> this is exactly why i don't trust wasabi enough to use it or suggest its use. way too much trust in nopara is needed.
03:30 < waxwing> oh, not worrying about attribution here, it's just kinda quite basic. perhaps there are finesses about when you reveal utxos tho', that's interesting.
03:31 < waxwing> like our whole podle shenanigans, but other things. coinjoin is ... hard.
03:32 < waxwing> i feel like if i were to start over i'd try to do a coinshuffle++ thing, but the mistake a lot of people made is to think that removes all these issues, it doesn't remove the incentive/coordination part or the "how do we decide on the inputs" part.
03:32 < waxwing> the individual who feels like wasabi might do this to them can take the approach suggested by one redditor, throw in some other disconnected coins.
03:33 < waxwing> on the surface that seems like a reasonable defence, at least against surreptitious attacks on blacklisted coins.
03:35 < belcher> you have to be aware of that attack, if you're using the wallet via its normal user interface then you wouldnt be doing the offer-up-multiple-utxos thing and detecting if all but one have been excluded
03:35 < belcher> maybe it could be added as a feature though
03:36 < waxwing> yes would have to be separate identities. one could also use the vitalik defence and say, ask a friend :)
03:37 < waxwing> that's why i didn't "big up" this "attack", it doesn't seem plausible at all really, it's just that there is a coercion point here, so there's a *potential* weakness.
03:39 < gmaxwell> Tim ruffing has been working on some coinshuffle++ implementation stuff using our minisketch library, which should simplify it some.
03:40 < waxwing> gmaxwell, is the finite field polynomial solving part performant enough?
03:40 < waxwing> this was like a year ago, but i remember him telling me that that was a bit of an issue.
03:40 < gmaxwell> minisketch solves that
03:41 < waxwing> oh damn yeah sorry bad memory, you told me this :)
03:42 < gmaxwell> 20ms for 256 outputs sound okay to you?
03:43 < waxwing> yes     
03:47 < gmaxwell> (also, the minisketch stuff is likely to get further speedups... less likely for some coinshuffle++ specific thing)
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