2016-05-29.log

--- Log opened Sun May 29 00:00:14 2016
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fluffyponynsh: I take it we would read the paper(s) before the hangout?00:32
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da2ce7hello all :)01:23
da2ce7A bitcoin-history question: What was the original behavour of the Satoshi client for dealing with replacement transctions. Was the first clients first-seen-safe?01:26
phantomcircuitda2ce7, blindly replace by sequence number i believe01:31
phantomcircuitwhich was only disabled because it was a trivial denial of service issue01:31
da2ce7without the sequence number feild set it was first-seen-safe?01:31
phantomcircuiti really don't like calling anything that's relying on unconfirmed transactions safe01:32
phantomcircuitsince they're the exact opposie01:32
phantomcircuitopposite*01:32
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da2ce7I completely agree. I'm wondering what the behavour was, whatever you call it.01:34
da2ce7I suppose it just ignored replacement transcations without a sequence number01:35
phantomcircuitda2ce7, i believe the mempool logic rigidly followed the sequence number01:35
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da2ce7cool; thankyou. :)01:36
* da2ce7 goes into the git time-mashine.01:36
da2ce7*machine01:37
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nshfluffypony, yeah, decided in advance02:05
nshmaybe more than one paper per session depending on length/difficulty02:06
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fluffyponynsh: awesome - I'm so in02:22
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nshokay, grand. i'll write a thing and make a place for suggestions for papers to cover and most accessible time to have the hangout (unless we find a better forum)02:24
fluffyponyMumble might be an option, low bandwidth requirements and its audio only02:25
smoothbsm117532: there is a lot of history with many alts that people use pools regardless of just about anything02:37
smoothyou could get a block an hour, people still use pools02:37
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nsh.title https://docs.google.com/document/d/10kTyCmGPhvZy94F7VWyS-dQ4lsBacR2dUgGTtV98C40/edit#03:52
yoleauxA Call for a Temporary Moratorium on “The DAO” - Google Docs03:52
EmmyNoetherA Call for a Temporary Moratorium on “The DAO” - Google Docs03:52
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nsh(argues broken incentive/voting mechanisms)03:52
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kanzure"NIZKs with an untrusted CRS: Security in the face of parameter subversion" http://eprint.iacr.org/2016/372.pdf08:16
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* nsh frowns08:20
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kanzure"‘Quasilinear-size zero knowledge from linear-algebraic PCPs" http://eprint.iacr.org/2016/021.pdf08:23
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nsh.to zooko thoughts on this? http://eprint.iacr.org/2016/372.pdf09:10
yoleauxnsh: I'll pass your message to zooko.09:10
zookonsh: I don't understand it very well. I know that Zcash scientists are working on proof systems09:11
yoleaux16:10Z <nsh> zooko: thoughts on this? http://eprint.iacr.org/2016/372.pdf09:11
zookowithout subvertible CRSes.09:11
kanzure"The unreasonable effectiveness of address clustering" http://arxiv.org/pdf/1605.06369.pdf09:11
nshzooko, anything i can look at?09:11
nshi think this paper is just defining known results a little more auti^Wclearly09:12
zookoThe other ref kanzure posted above is the latest result from Zcash scientists AFAIK.09:12
zookoIt's possible they've done more and I don't know about it. ☺09:12
zookohttp://eprint.iacr.org/2016/021.pdf09:13
nshcool. thanks!09:13
zookoI also don't understand that one very deeply.09:13
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kanzure"Extractable witness encryption and timed-release encryption from bitcoin" https://www.semanticscholar.org/paper/Extractable-Witness-Encryption-and-Timed-release-Liu-Kakvi/e4d287fb4672bfbbe7bf438df3e1f8aa97c8edb109:18
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kanzure"Analysis of the blockchain protocol in asynchronous networks" http://eprint.iacr.org/2016/454.pdf09:26
bsm117532smooth: Do you understand this dynamic of people using pools?  Is it psychology or something? Because if you make a block an hour, variance is not an argument to use a pool.09:30
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nshamiller, are you the Miller that the authors of this extractable witness encryption and timed-release encrpytion from bitcoin paper mention having a discussion with? the references seem to have been cut from the preprint09:39
nshoh no, i misread. they only refer to discussion in a public chatroom (likely here)09:39
amillernsh, yes09:39
nshhave you considered the paper? looks interesting09:39
nshi need to understand how extractable witness encryption works first though i guess09:40
amilleri think its really interesting :)09:41
amillerit's heavyweight crypto09:41
* nsh nods09:42
maaku_bsm117532: not everyone is double-digit percentages of the network09:45
* nsh wonders why a witness must be a certain length 09:46
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nsh'Security: If ∃w such that C(w) = 1 then Enc(C,0) ~=c Enc(C,1)  (where ~=c means "computationally indistinguishable").' -- http://people.eecs.berkeley.edu/~sanjamg/classes/cs276-fall14/scribe/lec18.pdf09:56
nshit's clear what this means, but i wonder if we should have a distinct existential operator for existing-and-being-known09:56
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bsm117532maaku_: That's why I brought up the numbers for Ethereum...because the pool-usage doesn't seem to be drastically different despite a 40x decrease in block time, and corresponding decrease in variance.  My hypothesis thus far was that pool usage was primarily due to variance reduction.  I'm clearly wrong...10:28
otheno you aren´t, it´s a mix of variance, comfort, lazyness and bad tooling10:29
bsm117532othe: I do think the slick UI's of pools I've seen are a contributor, as well as the ease of running cgminer vs. setting up a node.10:30
otheyeah and there was no open src pool software10:31
waxwingwouldn't pools be appealing due to orphan rates too? my gut feeling was that mining would become very centralized with fast block times due to costs of latency.10:31
* waxwing has never been a miner...10:31
otheso naturally they all hang on one pool and are too lazy to switch10:31
bsm117532Well...I can fix that waxwing... and it's not as bad on Ethereum as bitcoin due to their uncle treatment.10:32
bsm117532I admit to looking at pool lists for who had the lowest uncle rate...10:32
waxwingyes uncles i accept ameliorates, but i would suspect not enough10:32
waxwingwith such extreme latency-sensitive mining10:32
bsm117532The latency sensitivity is a timing assumption and a design flaw, that can be removed.10:33
waxwingyou can make latency irrelevant? wow :)10:33
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bsm117532Yes.  Make the block rewar something that is evaluated N blocks later, rather than causing a race.10:35
waxwingah, i see. sounds cool. have a vague feeling i heard about it before.10:35
bsm117532Been working on it for a while...damn day job...10:35
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nshone day ivy league university dns servers will stop shouting at irc10:48
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midnightmagicImplementation flaws in a specific alt-currency or pools thereof, or whose developers viciously attack other devs, is a non-theoretical (antagonistic) short-term development topic. :-/12:02
bsm117532midnightmagic: Finding a way to prevent pooling is not, however...12:03
bsm117532Would love to hear ideas...12:03
nshnotion: enforcing randomised and shifting coalitions is tantamount to preventing static, socially or geographically bound coalitions12:05
nshconjecture: pooling can be prevented by requiring people to pool randomly at small levels in a manner that is tied to pseduo-identity value12:06
bsm117532nsh: And now we're walking a fine line back to PBFT.12:07
bsm117532Node self-identification can't be enforced, except by centralized power.12:07
nshwell, wanting to retain your ability to spend your coin can be enforced12:07
nshor motivated12:07
nshor we can rely on extrinsic motivation thereto12:07
bsm117532I believe that's called "proof of stake"...12:08
* nsh nods12:08
nshbut has anyone considered a stake-tied requirement to cooperate with random partners on the network?12:09
nshor are you suggesting it'll be difficult to enforce for the same reasons that most PoS models fall down12:09
bsm117532nsh: Yes I'm suggesting the latter.12:09
nsh(the block reward mechanism itself is roughly a stake-tied requirement to cooperate with a random partner on the network)12:10
nshit's just that it applies to everyone that sees a valid block at once12:10
nshif we can make it apply to uniformly selected small subsets of nodes continuously then maybe it's useful12:10
nshbut that could just be another way of talking about braids; i don't know12:10
midnightmagican extension of p2pool sharechains, with more-correct, fractional coinbase payouts and specified- or un-specified membership therein is probably the only way for PoW-like security. anti-withholding mechs wouldn't work so well on decentralized pools. plus none of this is meaningful without commoditized mass-availability of smart-property mining devices and an ejection of established12:10
midnightmagicoligarchical fraud-derived mining conglomerates.12:11
* nsh nods12:11
bsm117532Bitcoin is open and PBFT is closed precisely because nodes need not self-identify.  I also worry that one is walking a line between a 33% security guarantee (PBFT) and a 51% security guarantee (Nakamoto) by mixing the two.12:11
midnightmagicPoS obviates the risk equation. there could be no calculation of work-required to revert all of established history.12:12
nshconsidering the asymptotic nonfundibility of bitcoin hashpower, there maybe 'plenty of room' between 33% and 51%12:12
nsh*fungibility12:12
nshthat's probably not the best phrasing. i mean it gets progressively wider a gap12:12
nshassuming that miners continue to represent the extreme of energy-efficient hashing12:12
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bsm117532The problem is how do you cryptographically prove *anything* about miners.  All we have at present is the hash values they provide, and the timestamps they include.12:19
bsm117532One thing that has been floating in my head...one can use commitments of Sequential Proofs of Work to measure inter-node latency.  One can then include consensus rules that dis-incentivize miner aggregation.12:20
waxwingas someone once said, identity is not the solution, it's the problem ;)12:21
bsm117532I've been fooling with incentive models that incentivize low-latencies.  But this also incentivizes pooling, and not using Tor/I2P or other anonymizing relay networks.12:21
bsm117532With enough data (and cryptographic commitments thereto -- such as SPoW) one could create an incentivization model that places miners equi-distributed on the surface of the Earth.12:22
bsm117532But...that creates some bizarre incentives like putting mining nodes in the middle of the Pacific.12:23
* bsm117532 prefers data over identity.12:23
bsm117532Anyone have any other ideas of kinds of data that could be cryptographically obtained about miners?12:24
katubsm117532: are commitments even needed for this? one thing you can do is force cluster assignments in a NUMS fashion (introduce random cluster bias)12:24
katuso the more "sybils" (for lack of better term) somebody has are forced to spread out and not form cliques12:24
bsm117532katu: can you elaborate?  I'm not familiar with NUMS.  You probably need commitments because otherwise the measurements will be gamed.12:24
katuhow can you game rtt?12:25
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katubsm117532: as for NUMS clustering assignments, see TorCoin. They use central consensus for this, but its possible to go without it if privacy of assignments is not necessary12:27
kanzurewaxwing: identity is definitely a problem, but also i think our whole architecture here is pretty broken (i mean, nobody really thinks that a system with 7 billion attesters would be stable - people will drop off or act maliciously or whatever).. more philosophically, there's not too many good reasons to have transactions at all, it's more like a routing/planning error the more you have to send additional transactions.12:32
waxwingkanzure: i'm a bit lost - no good reasons to have transactions? what else would we have? :)12:33
nshnums is just "nothing up my sleeves" - a mechanism to get a stream of entropy that we can be assured isn't biased to benefit anybody12:33
kanzurewaxwing: well, i'm assuming a system without people. i think people complicate things, and that's why we haven't figured out a suitable decentralization implementation.12:34
kanzurewaxwing: and without people, i think you can forego transactions (probably)12:34
waxwingthe zen of bitcoin :)12:34
* nsh smiles12:34
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kanzureif you (poorly!) define decentralization as number of people that are attesting to state/validity/ordering, then you end up with 7 billion people signing every block (which will have super high latency and due to downtime no blocks would ever get signed at all)12:36
kanzure*due to individual node downtime12:36
kanzurenot to mention sybil problems with picking "7 billion" or other collusion/cartel/coercion problems..12:36
nshi suppose you can go inductively from it being pretty impossible with infinity people, to largely manageable with 1 person, to absolutely ideal with 0 people12:37
kanzure0 people is the trustless setup SNARKs case, right?12:37
nshalso this generalises to a surprisingly broad range of problems12:38
c0rw1nhmm then one could imagine crypto-signing of all the data from absolutely total surveillance, to see who even tried to collude/cartelize/coerce12:38
nshsurewhynot12:38
kanzureif you assume total surveillance then i think a bunch of other things break.  presumably all collusion is private.12:39
kanzuremaintaining a file that defines your trust lines is an interesting strategy but i think nobody proposed a way to do consensus off of that, i think you just end up with lots of pockets of distrust and history incompatibility which is contrary to the purpose of a universal ledger12:41
c0rw1nhmm could cluster the ledgers by compatibility12:42
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c0rw1n( i've had a huge idea that that is a part of but it's totally not -wizards material and it needs to be written up properly some day )12:44
bsm117532kanzure: (and everyone) remove the word "trust" from the conversation, and see where it leads.  In my experience, "trust" is a word that is usually used as a proxy for a different concept, that can be measured in a different way.12:45
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kanzureno i was talking about "trust lines" the concept12:46
bsm117532e.g. trust = default risk?  willing to not validate data?  etc.12:46
kanzureor er, maybe the implementation12:46
kanzureno, the thing called "trust lines"12:46
bsm117532kanzure: You'll have to be more specific, I don't know what that means... ;-)12:46
kanzureit's from ripple :(12:46
c0rw1nRiple ?12:46
c0rw1nyeah.12:46
c0rw1nthe good idea that god fucked all ways to hell12:46
c0rw1n*got12:46
bsm117532Eh...Ripple just moves default risk to "gateways".  Their concept of "trust" is a proxy for "default risk of gateways".  Now tell me who is auditing them for that purpose and I'll tell you what I think of Ripple.12:48
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belcherbsm117532 could it be simply that the setup is easier for pools, you just point your mining software to the pool and go, with something like p2pool or solo you need to sync your own node13:09
bsm117532belcher: that's most definitely a factor.13:10
kanzureif that was true then someone would have tried that silly "validationless mining" stuff by now13:10
belcheriv found my joinmarket has less adoption than lending btc for margin on the bitfinex exchange, partly because its easier and partly because the advertising is less13:11
belcherthe returns are similar, less for joinmarket on a risk-adjusted basis13:11
belchererr, more*13:11
bsm117532belcher: I bet if JoinMarket was simply called an "exchange", you'd double your usage.13:12
belchermaybe build a GUI yield generator with a fancy new name13:13
bsm117532Slick UI + "make money fast" = lots of users.13:14
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zookonsh: I think that distinction betweens kinds of "exists" is potentially an important problem in cryptography theory.14:47
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* nsh nods14:58
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btcdraka16:10
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fluffyponybtcdrak: b16:12
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