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timeout: 260 seconds] 07:26 -!- zwischenzug [~zwischenz@189.221.45.150.cable.dyn.cableonline.com.mx] has quit [Ping timeout: 240 seconds] 07:31 -!- King_Rex [~King_Rex@unaffiliated/king-rex/x-3258444] has quit [Remote host closed the connection] 08:08 -!- shangzhou [uid156782@gateway/web/irccloud.com/x-fuxgtxfmtikdzmuk] has quit [Quit: Connection closed for inactivity] 08:27 -!- kmels [~kmels@190.106.223.101] has joined #bitcoin-wizards 08:29 -!- Starduster [~SD@unaffiliated/starduster] has joined #bitcoin-wizards 08:30 -!- Guest74405 [~t800@77.117.118.114.wireless.dyn.drei.com] has quit [Ping timeout: 276 seconds] 08:36 < amiller> is anyone working on N-party lightning 08:36 < amiller> as a way of reducing collateral costs 08:36 -!- t800 [~t800@77.117.10.246.wireless.dyn.drei.com] has joined #bitcoin-wizards 08:37 -!- t800 is now known as Guest92640 08:47 < katu> amiller: is there something particularly stopping a payment channel to be a multisig one? 08:49 < instagibbs> amiller, you could do it with a janky softfork, yes 08:49 -!- King_Rex [~King_Rex@unaffiliated/king-rex/x-3258444] has joined #bitcoin-wizards 08:49 < instagibbs> in Bitcoin, I asked you a while ago to try and do it in ethereum as-is, it might be possible 08:50 * amiller forgot lol 08:50 < instagibbs> hah! 08:50 < instagibbs> busy with interviews IIRC 08:50 < amiller> i don't think i understood what the goal would be until just now :) 08:50 < instagibbs> ah, right, it's pretty simple what the benefits are, but the negatives can also get quite high with higher N 08:51 < instagibbs> a 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) 08:52 < amiller> yeah, 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 cltv 08:54 -!- belcher [~user@unaffiliated/belcher] has quit [Read error: Connection reset by peer] 08:55 -!- belcher 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-!- MaxSan_ [~one@78.129.153.58] has joined #bitcoin-wizards 11:42 -!- xcthulhu [~mpwd@pine.noqsi.com] has joined #bitcoin-wizards 11:44 < xcthulhu> Hi! 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 question 11:46 < belcher> its believed satoshi didnt know about this feature so bitcoin signatures dont use it 11:46 < belcher> segwit probably allows it to be used 11:48 < xcthulhu> That’s a pity. Thank you. 11:48 -!- alpalp [~allen@unaffiliated/alpalp] has quit [Ping timeout: 240 seconds] 11:48 < Taek> can you do that with Schnorr? 11:48 < xcthulhu> Hopefully the segwit soft fork takes advantage of this… 11:48 < adam3us> Taek yes 11:49 < adam3us> the problem is schnorr supports batch signatures which requires the public key and verifies about 2x faster if i recall in libsecp 11:49 < adam3us> so if you omitted the pubkey you'd lose the ability to do fast batch sig verification 11:50 < Taek> depends on where the bottleneck ends up I suppose. If 3 years from now we have 32 core computers it might not be an issue 11:50 < adam3us> the other thing is schnorr signature aggregation if used across transaction inputs reduces average transaction size by 30% about. 11:50 < Taek> still wrapping my head around this, it's new to me, but I don't think you would lose signature aggregation 11:50 < adam3us> and it's coin join compatible so if you coin join all transactions in a block you get almost 50% smaller transactions. 11:51 < Taek> oh nvm you can't combine signatures without having all the pubkeys, because someone could make inverse pubkeys to omit signatures 11:51 < adam3us> so 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. 11:52 < adam3us> Taek yes you still need the pubkeys after aggregation 11:52 < adam3us> aggregation is possible because you can add schnorr pub keys and schnorr signatures and they still verify. 11:52 < adam3us> Taek did you figure out the inverted pubkeys on the fly ;) or you remembering from before? 11:53 < Taek> sipa told me about it at one point 11:53 < Taek> a good memory goes a long way :) 11:56 < adam3us> but what you could do i was thinking is have miners omit the pubkeys optionally. 11:56 < adam3us> eg if the blocks were under pressure they could tradeoff size for verification speed. 11:56 < adam3us> recalling you can still verify, just without the 50% batch verification speed improvement 11:57 < adam3us> gmaxwell was also saying you could send the pubkey instead of pubkeyhash + pubkey, that would be somewhere in between in size. 11:59 < adam3us> Taek 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 -!- nuke1989 [~nuke@178-139-213.dynamic.cyta.gr] has joined #bitcoin-wizards 12:00 < Taek> but then you lose privacy on the pubkey, which imho is important for doomsday stuff 12:00 < adam3us> Taek yes i like pubkeyhash only as the window for discrete log is then very short. 12:00 < Taek> because we only store pubkey hases before spending outputs, we can hard-fork in a guy-fawkes signature 12:01 < xcthulhu> If you have key recovery then you’ve already lost privacy 12:01 < Taek> xcthulhu: you have to reveal the pubkey when you make the signature anyway. The privacy is for before you sign anything 12:02 < adam3us> xcthulhu 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) 12:03 -!- GAit [~GAit@2-230-161-158.ip202.fastwebnet.it] has quit [Quit: Leaving.] 12:04 < xcthulhu> Heh. 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 < xcthulhu> Not that they aren’t valid 12:05 < xcthulhu> It’s just Ethereum is a dog and pony show 12:05 < xcthulhu> Off-topic 12:05 < xcthulhu> Thanks for the discussion, guys. 12:06 < Taek> Ethereum is doing a fair number of innovative things, and they've done a good job of getting nontechnical people excited about blockchains 12:09 < 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. 12:12 < xcthulhu> It’s a nice short term investment. 12:13 < MaxSan_> Not what I am about and I feel everything it offers is better done in different ways. 12:13 < Taek> Fwiw, Ethereum has had fewer angry mobs than Bitcoin. Though, they are younger 12:14 < 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 < xcthulhu> Hehe, I was at the head of one of those angry mobs a while back :D 12:14 < xcthulhu> (for Ethereum) 12:14 < belcher> do angry mobs really happen? wouldnt people just exit by selling? 12:14 < belcher> i dont think there have been any angry mobs in other altcoins 12:14 < xcthulhu> Ah, it was before launch 12:17 < xcthulhu> Anyway, I currently have a little contract work to do the crypto for an alt-coin. Should I consider supporting Schnorr’s algorithm? 12:17 < xcthulhu> I’ll ask somewhere else if that’s off-topic here. 12:18 < xcthulhu> By Schnorr’s algorithm I mean Schnorr signatures. 12:18 < adam3us> probably easiest thing to do is wait until bitcoin does it soon and copy it. 12:18 < xcthulhu> lol 12:19 < xcthulhu> Yeah that was my plan… except I want to include a bit to recover the PubKey from my ECDSA signatures which is harmless. 12:19 < xcthulhu> bitcoinj has the code in there for this already tbh it’s just dead. 12:20 < xcthulhu> lol and ethereumj is just copy-pasta of bitcoinj I love how moronic those guys are. 12:21 < xcthulhu> Anyway, thanks adam3us 12:23 -!- xcthulhu [~mpwd@pine.noqsi.com] has quit [Quit: xcthulhu] 12:27 -!- laurentmt [~Thunderbi@176.158.157.202] has joined #bitcoin-wizards 12:28 -!- laurentmt [~Thunderbi@176.158.157.202] has quit [Client Quit] 12:29 -!- alpalp [~allen@unaffiliated/alpalp] has joined #bitcoin-wizards 12:30 < waxwing> isn't the interactivity of doing aggregated schnorr going to be a problem? 12:32 -!- King_Rex [~King_Rex@unaffiliated/king-rex/x-3258444] has joined #bitcoin-wizards 12:35 < adam3us> well 30% of the potential ~50% compression comes from aggregating the inputs from your own multi-input transactions. 12:35 < adam3us> which you can do locally. 12:40 < waxwing> good point, true 12:43 -!- dEBRUYNE [~dEBRUYNE@unaffiliated/debruyne] has joined #bitcoin-wizards 12:44 < adam3us> waxwing the interactivity is compatible with coinjoin interaction 12:44 < waxwing> true, no doubt about that 12:44 < waxwing> i was more interested when you were talking about aggregating whole blocks together :) 12:45 < waxwing> "interested", i mean i was wondering about it 12:45 < waxwing> but these other cases are clear cut in terms of advantages, and that's enough... 12:46 < waxwing> still quite fascinated about the effectively infinite "compression" achieved by this aggregation. feels like a free lunch somehow. 12:46 < waxwing> and yet the algebra is clear enough 12:47 < adam3us> waxwing well it doesnt totally get rid of the pubkey+sig because you have to retain all the pubkeys 12:48 < waxwing> sure. still surprising. except in as much as schnorr is pretty much what a digital signature "should" be from first principles, at least seems that way 12:48 < waxwing> so i guess the simplest possible construction is the one most likely to have nice "symmetries" or whatever 12:49 < adam3us> waxwing yeah i believe dsa never would have existed except us gov cheaped out on buying the now expired patent from prof klaus schnorr 12:50 < adam3us> an nsa guy twiddled with it enough claim no patent coverage and the resulting more complicated less flexible result was dsa 12:51 -!- dEBRUYNE [~dEBRUYNE@unaffiliated/debruyne] has quit [Quit: Leaving] 12:51 < waxwing> i still can't quite believe i live in a world where people own equations 12:56 -!- ThomasV [~ThomasV@unaffiliated/thomasv] has quit [Ping timeout: 265 seconds] 13:09 -!- 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