2016-05-07.log

--- Log opened Sat May 07 00:00:07 2016
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amilleris anyone working on N-party lightning08:36
amilleras a way of reducing collateral costs08:36
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katuamiller: is there something particularly stopping a payment channel to be a multisig one?08:47
instagibbsamiller, you could do it with a janky softfork, yes08:49
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instagibbsin Bitcoin, I asked you a while ago to try and do it in ethereum as-is, it might be possible08:49
* amiller forgot lol08:50
instagibbshah!08:50
instagibbsbusy with interviews IIRC08:50
amilleri don't think i understood what the goal would be until just now :)08:50
instagibbsah, right, it's pretty simple what the benefits are, but the negatives can also get quite high with higher N08:50
instagibbsa native Ethereum N party would be something to play with, as you wouldn't have to lobby for a softfork(which has ~0% chance of being deployed)08:51
amilleryeah, once it's clear what the behavior should be with an eth prototype, then we can try to figure out how to stuff it into utxos and cltv08:52
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xcthulhuHi!  In understand that in principle public keys can be can be recovered from signatures, and that BitCoin Core has entertained implementing this in the past.  Now that block space is scarce, are they doing this now?  Sorry if this is a n00b question11:44
belcherits believed satoshi didnt know about this feature so bitcoin signatures dont use it11:46
belchersegwit probably allows it to be used11:46
xcthulhuThat’s a pity.  Thank you.11:48
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Taekcan you do that with Schnorr?11:48
xcthulhuHopefully the segwit soft fork takes advantage of this…11:48
adam3usTaek yes11:48
adam3usthe problem is schnorr supports batch signatures which requires the public key and verifies about 2x faster if i recall in libsecp11:49
adam3usso if you omitted the pubkey you'd lose the ability to do fast batch sig verification11:49
Taekdepends on where the bottleneck ends up I suppose. If 3 years from now we have 32 core computers it might not be an issue11:50
adam3usthe other thing is schnorr signature aggregation if used across transaction inputs reduces average transaction size by 30% about.11:50
Taekstill wrapping my head around this, it's new to me, but I don't think you would lose signature aggregation11:50
adam3usand it's coin join compatible so if you coin join all transactions in a block you get almost 50% smaller transactions.11:50
Taekoh nvm you can't combine signatures without having all the pubkeys, because someone could make inverse pubkeys to omit signatures11:51
adam3usso the point with schnorr aggregation is it reduces the number of signatures used at all.  if you coinjoin everything there is one signature in the entire block.  if you aggregate across your own inputs only it's 30% smaller not sure what ratio fewer sigs that is.11:51
adam3usTaek yes you still need the pubkeys after aggregation11:52
adam3usaggregation is possible because you can add schnorr pub keys and schnorr signatures and they still verify.11:52
adam3usTaek did you figure out the inverted pubkeys on the fly ;) or you remembering from before?11:52
Taeksipa told me about it at one point11:53
Taeka good memory goes a long way :)11:53
adam3usbut what you could do i was thinking is have miners omit the pubkeys optionally.11:56
adam3useg if the blocks were under pressure they could tradeoff size for verification speed.11:56
adam3usrecalling you can still verify, just without the 50% batch verification speed improvement11:56
adam3usgmaxwell was also saying you could send the pubkey instead of pubkeyhash + pubkey, that would be somewhere in between in size.11:57
adam3usTaek ie currently with p2sh it is sending pubkeyhash, and then pubkey+sig; using key recovery it would send pubkeyhash, then sig; with gmaxwell 3rd variant it could send pubkey, then sig which is still batch verifiable and in between in size between the 2 other options.11:59
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Taekbut then you lose privacy on the pubkey, which imho is important for doomsday stuff12:00
adam3usTaek yes i like pubkeyhash only as the window for discrete log is then very short.12:00
Taekbecause we only store pubkey hases before spending outputs, we can hard-fork in a guy-fawkes signature12:00
xcthulhuIf you have key recovery then you’ve already lost privacy12:01
Taekxcthulhu: you have to reveal the pubkey when you make the signature anyway. The privacy is for before you sign anything12:01
adam3usxcthulhu Taek means it delays knowledge of the pubkey so you cant try to do a huge discrete log attack, as you cant start the DL attack until you know the pubkey (and people shouldnt be reusing pub keys)12:02
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xcthulhuHeh.  I worked on Ethereum (just the mining algo, nothing else really).  I love how we never gave a damn about any of these concerns…12:04
xcthulhuNot that they aren’t valid12:04
xcthulhuIt’s just Ethereum is a dog and pony show12:05
xcthulhuOff-topic12:05
xcthulhuThanks for the discussion, guys.12:05
TaekEthereum is doing a fair number of innovative things, and they've done a good job of getting nontechnical people excited about blockchains12:06
MaxSan_innovation is one thing but the whole "built it and they will come" is long dead. Its a good way to get an angry mob if promises are made about expectations of a platform that dont live up to requirements.12:09
xcthulhuIt’s a nice short term investment.12:12
MaxSan_Not what I am about and I feel everything it offers is better done in different ways.12:13
TaekFwiw, Ethereum has had fewer angry mobs than Bitcoin. Though, they are younger12:13
MaxSan_Anyone that offers "blockchain" solutions and smart contracts together their architectural  logic of the platform is probably dreadful or a marketing scam.12:14
xcthulhuHehe, I was at the head of one of those angry mobs a while back :D12:14
xcthulhu(for Ethereum)12:14
belcherdo angry mobs really happen? wouldnt people just exit by selling?12:14
belcheri dont think there have been any angry mobs in other altcoins12:14
xcthulhuAh, it was before launch12:14
xcthulhuAnyway, I currently have a little contract work to do the crypto for an alt-coin.  Should I consider supporting Schnorr’s algorithm?12:17
xcthulhuI’ll ask somewhere else if that’s off-topic here.12:17
xcthulhuBy Schnorr’s algorithm I mean Schnorr signatures.12:18
adam3usprobably easiest thing to do is wait until bitcoin does it soon and copy it.12:18
xcthulhulol12:18
xcthulhuYeah that was my plan… except I want to include a bit to recover the PubKey from my ECDSA signatures which is harmless.12:19
xcthulhubitcoinj has the code in there for this already tbh it’s just dead.12:19
xcthulhulol and ethereumj is just copy-pasta of bitcoinj I love how moronic those guys are.12:20
xcthulhuAnyway, thanks adam3us12:21
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waxwingisn't the interactivity of doing aggregated schnorr going to be a problem?12:30
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adam3uswell 30% of the potential ~50% compression comes from aggregating the inputs from your own multi-input transactions.12:35
adam3uswhich you can do locally.12:35
waxwinggood point, true12:40
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adam3uswaxwing the interactivity is compatible with coinjoin interaction12:44
waxwingtrue, no doubt about that12:44
waxwingi was more interested when you were talking about aggregating whole blocks together :)12:44
waxwing"interested", i mean i was wondering about it12:45
waxwingbut these other cases are clear cut in terms of advantages, and that's enough...12:45
waxwingstill quite fascinated about the effectively infinite "compression" achieved by this aggregation. feels like a free lunch somehow.12:46
waxwingand yet the algebra is clear enough12:46
adam3uswaxwing well it doesnt totally get rid of the pubkey+sig because you have to retain all the pubkeys12:47
waxwingsure. still surprising. except in as much as schnorr is pretty much what a digital signature "should" be from first principles, at least seems that way12:48
waxwingso i guess the simplest possible construction is the one most likely to have nice "symmetries" or whatever12:48
adam3uswaxwing yeah i believe dsa never would have existed except us gov cheaped out on buying the now expired patent from prof klaus schnorr12:49
adam3usan nsa guy twiddled with it enough claim no patent coverage and the resulting more complicated less flexible result was dsa12:50
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waxwingi still can't quite believe i live in a world where people own equations12:51
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maakuThe fact that something as trivial as Schnorr can be patented says much about our system13:45
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sipaohai.15:25
fluffyponyola15:25
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