2015-06-11.log

--- Log opened Thu Jun 11 00:00:38 2015
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fluffyponyandytoshi: Shen is MRL, I think the Darkcoin stuff was just because that's his baseline for understanding CoinJoin01:13
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waxwingso in 3.3.1 of Borromean, you have n "OR-loops", each one has m_i keys involved and you only know the privkey for one of them. And there is one AND joining vertex, at index zero. Is that right?04:17
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waxwingin the confidential_values.txt, it says that sender and receiver do ECDH so the sender can transfer the blinding/amount info to receiver; when/how is that done?05:42
waxwingoh, i guess it can be done with the transaction maybe? because pubkeys are known.05:43
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waxwingah, so it's like embedded into the signature? (trying to parse 'by careful use of derandomized signing..')05:44
waxwingor, proof not signature, rather05:46
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xcthulhuhttp://www.reddit.com/r/ethereum/comments/39imrr/vitaliks_premine_sale_opportunity/17:13
xcthulhuLet’s see if he’s gonna eat his own horseshit, shall we?17:14
gmaxwellofftopic here.17:17
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xcthulhu(sorry)17:24
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wwwhi18:59
wwwis there a good way to publish extended public keys on the blockchain?19:00
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sipawhy would you do such a thing?19:00
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wwwhi sipa :)19:00
wwwto let people generate stealth addresses or other derived addresses from your main address19:01
sipathat's utterly pointless if you publish the extended address19:02
wwwwhy?19:02
wwwhow would you do it?19:02
sipathe point against address reuse is because it reduces your privacy19:02
sipaif you *publish* your extended address you've now given a way to the world to detect all related addresses19:02
wwwstealth addresses increase your privacy?19:02
sipastealth addresses != extended addresses19:03
wwwyou definetly can have stealth with extendet keys19:03
wwwwhich stealth do you mean?19:03
wwwfurthermore there are good usecases where you want to have a proven record of transactions. don't assume that always everything has to be private. but this is not related to stealth ;)19:05
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wwwlol19:05
wwwwhy is everybody here so arrogant?19:05
gmaxwellwww: What you're saying doesn't seem to make a lot of sense. You say it would be more private, but sipa points out that if you publish an extended public key then its not private at all.19:09
amillerwww, not arrogant, just with scarce attention19:10
gmaxwellYou had to give the payer the address some way, use that channel, give them the extended public key. Tada; and then thats also private if thats something you care about.  The blockchain is not a message bus.19:10
wwwmaybe you are talking about a different way to do stealth?19:10
wwwwhat if you can't establish a channel?19:11
wwwbecause you are async?19:11
gmaxwellwww: you still have to give someone the address in the first place; there _must_ be communication otherwise they don't know anything at all.19:12
gmaxwellwww: well you asked about a specific thing-- giving someone an extended public key.19:12
gmaxwellmaybe you meant something else? regardless. If you need a communication channel you need a communication channel, the blockchain isn't good for that (though it can be abused that way)19:13
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wwwyes, I think to have the extended pubkey on chain is very reasonable and useful when you want to have certain types of stealth payments and to avoid address reuse19:14
gmaxwellwww: if the extended public key is public then everyone knowns all the addresses, its completely non-private.19:15
wwwyou just need to publish it once somewhere linked to yoru identity19:15
wwwit's optional. public OR private/stealth19:15
gmaxwellwww: great, and you can include the extended public key there, and when they check that they'll have the whole thing! tada done! and no need to put it in a perpetual public database where it will be visible to the whole world.19:16
wwwof course you do not generate the stealth addresses the 'HD' way19:17
wwwthen of course they would be public (which is still sometimes wanted)19:17
gmaxwellThen why the heck are you asking about an extended public key?!19:17
gmaxwellwww: if you put the extended pubkey in the blockchain there would be no privacy because anyone else could go and derrive the same addresses.  As you note, if you're already depending on publishing your address someplace linked to your identity, you can put the extended key _there_. Why do you not just put it there, and kill two birds with one stone.19:17
wwwagain and again: because you can have stealth addresses with it. don't get how?19:18
gmaxwellwww: so clarifying, what your'e asking about is not an extended public key, but a "stealth address". Okay, now that makes a little more sense.19:18
gmaxwellBut I have still not gathered why you are not happy with the point that when you check the publication-linked-to-your-identity that can't just encode the stealth address, saving you the extra publication step?19:19
wwwbecause there is also a good censorship-free way to put other information... like a name to your address. even if you tell me not to do so19:19
wwwyou can't call somebody and tell them that you are 1xyca;sdhfalsjdfh&*y9rf19:20
wwwusability is terrible19:20
gmaxwellthe Bitcoin network is very much not censorship free.19:20
gmaxwell(alas)19:21
phantomcircuitor is at least much less so than other channels19:21
gmaxwellokay so what you are really looking for is something like namecoin then?19:21
wwwif the bitcoin network is not, then nothing is?19:21
gmaxwelle.g. something to attach unique human friendly names to keying material?19:21
wwwno, it is way more simple than namecoin19:21
gmaxwellnamecoin is super simple.19:21
wwwit is called bitcoin19:21
wwwno need to use another network if you just want to have names with optional stealth payments for bitcoin19:22
gmaxwellwww: in the bitcoin network today your transactions can be freely surpressed by the decision of ~3-4 parties, at no cost to themselves; the main defense against that is being indistinguishable. (and hope that they don't target you)19:22
wwwso bitcoin is broken?19:23
gmaxwellwww: I wasn't suggesting using namecoin, I'm trying to decode what you're actually trying to accomplish because it is unclear.19:23
* Luke-Jr suggests rename extended public key -> extended watch key19:23
wwwmaybe we need a well defined bitcoin dictionary19:24
gmaxwellExtended public key is a well defined term, but I don't care what you call things so long as I can figure out what you mean.19:25
gmaxwellI think I've figured out what fork of what you're asking for there. But now, this last part sounds like you're looking for a key value database.19:25
gmaxwellPreumably you'd want it to be efficiently and securely queryable?19:26
wwwwould be best, yes19:27
gmaxwell(otherwise, ... why not just have whatever centeralized services most people would trust to query it keep a list! :) )19:27
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wwwback to something you said: if 4-5 entities control bitcoin as yous aid, why don't they block e.g. the silkroad coins?19:28
gmaxwellwww: okay, well there currently isn't a way to do that in bitcoin even if you look aside at the misuse of the system to store key/value data. The challenge is in making it securely queryable. It's not fundimentally hard to do this, but it requires additional commitments that bitcoin doesn't have.19:28
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wwwjust run a full node if you want highest security19:29
wwwno?19:29
wwwotherwise trust friends who run a full node19:30
wwwand so on...19:30
gmaxwellwww: Perhaps but the overwhelming vast vast majority of users don't do that--- and the trends are in the opposit direction (esp with talk of increased load on the system); so IMO something that doesn't have security at all except for full nodes seems like a waste... just pretextual security. E.g. if most users are just going to trust bc.i why saddle everyone else with more load?19:30
wwwtrends are pointing in a bad direction for bitcoin, indeed19:31
wwwwhen you download your full node client you trust again somebody that the right genesis hash is hardcoded, right?19:32
wwwso fundamentally you always need to trust somebody initially19:33
wwwif you can diversify trust (multiple friends) then security increases19:33
gmaxwellwww: thats not the case. I mean if the wrong one is hardcoded you'll notice that you're rejecting the longest chain.19:34
gmaxwellwww: in any case, so there you're imaging some kind of friend network. OKAY, but if you have the friend network, why isn't it just answering your queries?19:34
wwwwould you also check the magic byte and port number and difficulty?19:34
wwwprobably you would19:35
wwwbut most people don't... again19:35
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gmaxwellwww: you could, if you liked. Come you must admit thats not really much of a plausable attack.  Where lots of people trust websites which can just start giving false information at any time, due to hacks or bugs or because the operators were evil all along.  While in the software case, there is one chance for it to be busted, and that much is auditable and detectable, and we use a public signing19:36
gmaxwellprocess to make sure you're not being given a bad version just for you.19:36
gmaxwellIn any case, if you think its fine for people to just trust some popular website (or a few), okay, thats not a totally irrational position.  For some applications it is.  But then why the blockchain pretext?19:37
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wwwwhy not just a friend network? because I actually just want to send coins to names with a high-enough security in a convenient way. nothing is perfectly secure. but IMO it would be an improvement19:37
wwwforget websites19:38
wwwi never talked about websites19:38
wwwhmm19:38
gmaxwellBut in your example you claimed that you didn't care if it could be efficiently securely queried because you could ask friends, ... in that case you're trusting the friends, so why not just do that?19:39
wwwthe attack could be done. several factors improve the security of bitcoin. it is not just one thing.19:39
gmaxwellwww: do any of your friends (e.g. people you already know offline?) run bitcoin full nodes today?19:40
wwwyes19:40
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wwwbut with friends I mean several generally trusted entities.19:40
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gmaxwellI find that a little unlikely.19:40
gmaxwellokay then.19:40
wwwe.g. you download a wallet. you generally trust the wallet developer19:41
gmaxwellin any case, ... if you are happy with security reducing to a "generally trusted entity" then why not have the entity keep the database? at that point your security is much better, e.g. it can be guarenteed instant update and reorg free (assuming the honesty of the 'generally trusted entitys' holds), and their behavior could be completely auditable.19:42
wwwa lot of companies values is based on reputation. even if one of them becomes evil or just gets hacked, then it would be good ot have alternativesj to check against. aways. diversify19:42
gmaxwelland just as a minor bonus you wouldn't be subjecting yourself to the censorship of both the generally trusted entity _and_ some small number of miners, but only the former.19:42
gmaxwellwww: true, but a collection of companies can keep a database without using bitcoin.19:43
wwwbecause it is not good to trust just one entity?19:43
gmaxwellsee above19:43
wwwbut it is not open?19:43
kanzurethere are many open-source database implementations19:43
gmaxwelland because of query efficiency you still are trusting one entity in that example.19:43
wwwit is not about open source but about open access (censorship free)19:44
kanzureyeah they can do that19:44
kanzurebut "censorship free" does not mean what you think it means19:44
wwwkanzure: give me the dictionary please19:44
gmaxwellwww: again, if you're accessing via trusted entities x,y,z  then any condition under which they could censor a database they ran they could also censor the queries they ran for you.  Plus on the bittcoin case you get extra censorship from miners and potentially node operators that don't appricate you using their _currency_ as a rolodex. :)19:45
kanzurewell you're in a cryptography channel, so censorship resistance here is completely unrelated to whether something is open or closed access19:45
wwwit has some similarities kanzure19:46
kanzurenope19:46
wwwgmaxwell: you say the miners own bitcoin?19:46
wwwin my eyes the miners do rather stupid calculations19:47
wwwand follow what the cool people (maybe you) say19:47
kanzurewhy are you in charge of deciding who is cool19:48
kanzurethat doesn't make sense19:48
wwwi don't do this19:48
kanzurei think that you will find that nobody said that the miners own bitcoin19:50
wwwif your assessment is right, gmaxwell, then bitcoin seems broken to me, because the miners (handful entities) have too much power19:50
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kanzurewell it's also possible that the design is achieving something other than what you had considered19:50
wwwi remember satoshi writing about 'one-cpu-one-vote'19:51
kanzurethat was one of the things he was wrong about19:52
kanzurebyzantine sybil resistance is incompatible with counting cpus19:52
wwwbut with counting asics it is?19:52
wwwI also remember somebody quoting gavin "in the long run bitcoin will not be secured by PoW"... any development in this direction?19:54
kanzureyou also can't count asics because they have no identity19:54
kanzureand identity is spoofable. that's what sybil resistance protects against.19:54
wwwgood point19:55
wwwbut you see that the initial design goals also evolve over time19:56
kanzureif you say so19:56
wwware you a miner?19:57
wwwoperator?19:57
kanzurei have been known to flip a few bytes19:57
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wwwso let me sum it up: there is no good way to add extended* public keys to the blockchain. bitcoin is controlled by a handful of people. and maybe: trusting identities is bad but trusting computational power is a good thing.20:02
wwwi am not convinced ;)20:02
kanzure"there is a specific design to bitcoin that makes some ideas workable and others not"20:06
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gmaxwellThe hashpower distribution is currently busted. There are reasons to think things will improve. The bustedness is less concerning when the use is less trusting / less censorable (or could easily become much harder to censor); when you talk about something like a key value store, these current issues may be much more relevant.20:36
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gmaxwellI didn't say that 'trusting identities' is bad, it is what it is.  But if you're going to trust parties to run a query server for you; why not trust them to just keep the database too; and then you remove a whole host of failure modes, and are just left with the trust related one.20:38
gmaxwellsince you can't do an efficient secure lookup against bitcoin, you assume some trusted servers (or at least some threshold like the majority is honest)  OKAY; there are cases where thats totally reasonable. So why not stop there and use that rather than adding additional weaknesses and costs? thats all I was pointing out.20:40
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wwwthanks for your feedback, gmaxwell. I get what you say. the reason why to have the data on-chain is to have a open API where you don't need to ask for permission to use it. the trusted parties simply proxy you the results but ideally you interact directly with the blockchain. at least there is the option.21:02
wwwof course this is flawed when transactions get blocked by some miners.21:04
gmaxwellIt's important to avoid decenteralization-theater though.  E.g. if looking up names securely requires at 300 GByte download, whos going to do that?  I say its important to avoid, because if we pretend something has all these fantastic security properties that it doesn't have in practice, then we're setting people up for a massive falure.  Sort of the mess we've arrived at with the web CA system.21:04
gmaxwelle.g. under some theory of operation the SSL/CA model could be quite nice, in the end the security it provides is very thin (e.g. anyone who can MITM your webserver towards the internet can get a cert as you) because of how its praticaly deployed and used.21:05
wwwwell... everybody who wants to become a trusted party for his friends/customers can easily download 300 GB. in case you bootstrap your chain via a torrent, this could be way less, right? the important thing is that entities can freely access the complete data for themselves or for others and that they can also disappear and be replaced by others (in case they become unreliable or loose reputation for a reason). yes, it is a layer on top of t21:12
wwwhmm blockchain size is just 35 GB? also a super cool sidechain could be made for this, no? :D21:15
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gmaxwellright now, though the rules of the network let it grow 52gb/yr currently; and there is a proposal to increase that to 1TB/yr.21:16
gmaxwellwww: there are lots of ways to accomplish it in a parallel network sure, dunno that a sidechain would be super applicable though.21:16
www1TB/yr is worst case, though. in 10 years 1 TB/year will also not really matter maybe. And is not one of the points to have sidechains that you don't need to be a full node for all the network but that you can be just a "full" node for your sidechain?21:20
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wwwcan't the nodes of sidechains be teached to validate OP_RETURN data in a arbitrary way?21:20
gmaxwellwww: well it wouldn't be OP_RETURN... it would just be transaction data. ... but no thats not my point. If your system is just a database of X there is may be no reason to involve a cryptocurrency in it.21:22
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gmaxwellSurprise: there are other kinds of distributed database than blockchains!21:22
wwwif a currency comes for free, why not use it for having a fee structure?21:22
www...to avoid spam e.g.21:23
wwwseems useful21:23
gmaxwellTrue, though antispam can be done without the complexity of a two-way peg. E.g. by proof of solvency, or by hashcash, etc. lots of options.21:24
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wwwif hope you are working on abstracting the complexity of a two way peg ;)21:25
wwwby the way, when will it be ready?21:25
wwwon mainnet21:25
gmaxwell"When its ready" :)21:26
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wwwand... how long will the debate be on whether or not sidechains need to be introduced? just looking at the current blocksize debate. such a super simple thing takes so much resources.21:26
wwwwas there a debate when the blocksize limit got introduced? was there a debate when the OP_RETURN size got halved? don't know21:27
gmaxwellThe blocksize stuff is a hard fork; it basically takes the rules of bitcoin and rewrites them to be against the current rules, everyone has to change, everyone is impacted.21:27
gmaxwellop_return stuff is just node policy not a consensus rules of the system at all.21:28
gmaxwellThe 2wp stuff merely requires script enhancements, in fact I'm reasonably confident that it was actually possible (though a bit ugly) with bitcoin script before opcodes were disabled.21:29
gmaxwellIn any case, soft-forks; while also not trivial are much easier.21:29
wwwsounds good21:30
gmaxwellsince, so long as they don't restrict tx patterns people are already using-- you're mostly free to not use them.21:30
wwwbut the nodes/miners need to understand that the new transactions are valid, otherwise they will reject them?21:32
gmaxwellno, a soft fork only restricts the space of valid transactions. it takes a transaction that the old network sees like "anyone can spend" and restricts it to "can spend according to these rules"21:34
gmaxwellit's like subtractivel carving a new feature out of marble.21:34
wwwcould altcoins become sidechains of bitcoin?21:35
wwwmigrate....21:35
wwwWITH their own PoW?21:35
gmaxwellwell the whole thing about bitcoin sidechains is that they're backed by bitcoin, the bitcoin has to come from somewhere. And yes, a sidechain can have its own POW, at least so long as the chain its aside knows how to verify that POW if the spv-2wp is used.21:36
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wwwbut altcoins could become 'assets' on a bitcoin sidechain then...?21:37
wwwso you would pay just the tx fee with bitcoin21:38
gmaxwellI'm not sure why you'd want to do that, but sure.21:39
wwwback to the soft fork: what if half of the network plays according to the old rules "anyone can spend" and the other half restricts spending to the new rules. who is right?21:40
gmaxwellhashpower majority; which is why soft-forks don't activate until picked up by a supermajority of hashpower. http://bitcoin.sipa.be/ver-ever.png  shows the process for two softforks.21:42
wwwcould not the same be done with the blocksize issue (hardforks)?21:43
wwwa fork is a fork21:43
wwwi like the idea of having multiple with each other interacting blockchains with different PoW. would add security in my eyes.21:44
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wwwsoft fork = fork on transcation level. hard fork = fork on block level (?) - both to be avoided in every case21:48
phantomcircuitwww, soft fork is when the change is backwards compatible21:55
phantomcircuitie rejecting transactions which the older versions accept is backwards compatible so long as the majority of mining power follows those new rules21:57
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phantomcircuita hard fork is a change which older versions reject21:57
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phantomcircuithttps://www.reddit.com/r/Bitcoin/comments/39hgzc/blockstream_cofounder_president_adam_back_phd_on/cs3ue6g22:14
phantomcircuit"you're being too logical" -cypherdoc22:15
phantomcircuitthat is pure comedy gold22:15
gmaxwellphantomcircuit: perhaps but not really ontopic here!22:15
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