2015-03-18.log

--- Log opened Wed Mar 18 00:00:22 2015
--- Day changed Wed Mar 18 2015
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sipaMuis: you can introduce a new script language as a softfork, by using an OP_EVAL like construct06:48
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MuisAnd that language has only 1 command: recover public key from signature06:48
MuisOr how would the op codes look?06:49
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sipatell me when you figure it out :)06:49
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Muishttps://github.com/sipa/bitcoin/commit/6e223c405988a1002eeeee69db88a1128a38b0a306:51
sipayes, that's the code to implement them06:52
sipathe tricky part is using it in scripts06:52
Muisyes thats all i need06:52
sipagood luck then06:52
MuisBecause there are no scripts in my protocol06:52
MuisSo they all look the same06:52
sipawhat do you store in script outputs?06:53
sipaeh, in transaction outputs06:53
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Luke-Jrsounds like more of a topic for ##altcoin-dev06:54
MuisJust the public key of the receiver06:56
sipaMuis: then how are you going to use pubkey recovery to _not_ store that pubkey06:57
sipaif your protocol already says storing it :p06:57
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MuisGood question. But your scheme decreases Bitcoin tx from 133 to 65 bytes, so why would it work ffor Bitcoin and not in my case?07:00
sipai'm asking you to think how to make it work07:01
sipayou seem to assume it's pixie dust that just decreases things07:02
Muis" Currently, bitcoin txin's for spend-to-address transactions use a DER-encoded signature + DER-encoded public key, resulting in 139-byte scripts. Assuming we drop the DER-encoding (except for a version byte), we could reduce this to 65 bytes."07:02
sipayou need to significantlty redesign things to make it work07:02
MuisSo i must limit to spend-to txs07:03
sipafirst of all, it just doesn't apply to your design07:03
sipait's inherent to how bitcoin's pay-to-pubkeyhash works07:03
sipait wouldn't work for pay-to-pubkey, which is what you're using07:04
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Muissipa: i can still change to pay-to-pubkeyhash, im just experimenting with a design07:07
sipawell understand former design decisions before changing them :)07:08
kanzureagreed07:09
sipayou can't just say "hey i'm going to use this optimization which was described years ago in a different context", and expect it to just work07:09
Muistrue07:09
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MuisIm just trying to build a fork of Bitcoin where each address is the start of a new chain you can follow, and each address in that chain is also a possible genesis for a new chain. I did this by mis-using the nServices field for a peer, so that each peer can indicate which chains it follows (by filtering them on the first x bytes which match their IP). And if07:17
Muisyou need the headers of chain X, you dont connect to different networks/peers, but there is a large chance you can ask your existing peers.07:17
MuisBecause there will be a lot of mini chains, just like a forum with topics, the chains need to be as small as possible07:18
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MuisThats why im interested in your idea to save space07:18
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benjyz1hi. is anyone using RPC via Java with bitcoinj objects?12:10
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amiller_benjyz1, that sounds better for #bitcoin-dev12:13
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benjyz1maybe. in general I think core people could more engage with devs working on API's.12:15
kanzure"core people" are in #bitcoin-dev12:15
benjyz1kk. so how do I go about acquiring the wizards title?12:16
kanzurethe channel name has already been registered with chanserv12:17
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kanzurehttp://www.somethingsimilar.com/2013/01/14/notes-on-distributed-systems-for-young-bloods/15:29
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andytoshigmaxwell: adam3us1: can you guys think of a technical security definition for DMMS that doesn't outright exclude PoS?16:38
andytoshii think this "creating a block is super easy for the signers (who change each block) but impossible for everyone else" idea actually doesn't fit under the same umbrella as bitcoin's "every block is equally hard to make for all parties", but i'd like to be wrong for didactic reasons16:39
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nshhmm16:54
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andytoshilike, i've heard it said (at least in my own thoughts) that "pos is a broken dmms" but i think the mechanism that it tries to produce consensus by is conceptually totally independent of dmms16:55
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gmaxwellI think if you try to analyize it as a dmms you find that it's broken as one.17:06
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andytoshiyeah, but when i try to formalize dmms i seem to find that either the security property is way too permissive (and doesn't provide any protection against bad histories) or it's tight enough that it excludes PoS for reasons that feel like technicalities17:10
andytoshimaybe i'm just not being creative enough17:11
Elielgmaxwell: have you taken a look at BitShares lately? (since last august or so) If so, I'd be curious to hear your opinion on the technical choices they've made and if you think the result is viable.17:13
Eliel(other peoples' thoughts are welcome too, of course)17:14
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andytoshiit's fine, i think i want to define dmms so that (a) "dmms -> consensus in absense of central parties" can be shown; (b) "dmms does not imply an absense of central parties" is not true, to prevent centralization you need a bunch of technical features (cf asic-faq.pdf) and some hope; (c) might not be true that dmms is -required- for distributed consensus; (d) pos is not a secure dmms, though not for17:24
andytoshiparticularly interesting reasons; (e) you cannot get consensus from pos alone17:24
andytoshiif any of those statements contradict peoples' intuition about DMMS or consensus i'm interested to hear about it17:24
gmaxwellEliel: not latey, I kinda wrote off that camp after their initial stunts which were really reprehensible.17:25
andytoshioops, (b) should be true17:25
gmaxwellAfter hoskins abandoned it to go start ethereum I sort of expected it to fade out.  Have a particular citation on something I might find actually interesting?17:25
Elielgmaxwell: I also lost interest in that camp quite a while ago. However, having looked their stuff over lately, it's quite intriquing. I'll dig up a link for you, a moment.17:27
phantomcircuitandytoshi, i kind of suspect there's an edge case in making forks part of the consensus algorithm17:29
phantomcircuitbut i couldn't figure out how to do that without it being trivial to DoS17:29
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andytoshiphantomcircuit: oh, thx, that's a good intuition (since i doubt "dos resisistance" will have anything to do with consensus-primitive definitions i'll bet there is a counterexample there to anything i come up with)17:32
phantomcircuitalso i think gmaxwell had something to say that17:32
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gmaxwellwell "dos resistance" can also mean "given finite bandwidth between nodes, the system will converge in acceptable time, even with some nodes byzantine"17:37
Elielgmaxwell: I've got a few links now. A couple on the technical aspects and one that outlines the history of the project, as well as what mistakes they made along the way and why those were mistakes.17:37
gmaxwell(*in acceptable time with acceptable probablity)17:38
Elielgmaxwell: here's tech overview http://wiki.bitshares.org/index.php/DPOS http://wiki.bitshares.org/index.php/TITAN17:38
phantomcircuityeah to be clear when i say dos issues i mean it wouldn't work because you can make each peer do a nearly infinite amount of work at little to no real cost17:38
phantomcircuitalthough there's an incentives argument that it is at a real (opportunity) cost17:38
phantomcircuitbut im not sure that works17:38
Elieland this is the history http://wiki.bitshares.org/index.php/BitShares/History17:38
phantomcircuitthis is actually why i was asking about proof of work functions that had forward progress before17:39
phantomcircuityou might be able to mitigation the dos issues with one17:39
phantomcircuitor that might horribly break consensus17:40
phantomcircuiti couldn't quite figure that out17:40
Elielgmaxwell: there's also all kinds of information in the articles on this blog by the founder. http://bytemaster.bitshares.org/17:41
phantomcircuitoo neat17:42
Elielhttp://bytemaster.bitshares.org/article/2015/01/20/The-Minimal-Requirement-for-Decentalization/17:42
phantomcircuiti've got a bitcoin node with -proxy=127.0.0.1:9050 (tor)17:42
phantomcircuitALL of the peers are .onion17:42
phantomcircuitthat seems a bit fishy to me17:43
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gmaxwellEliel: well it's not really good that that 'dpos' page really says nothing about security model except a few 'Disincentives for attacks' lines at the bottom, which seems limited to the 'random number' generation.  Delegation for POS was suggested by me (and I'm sure others) in the earliest POS threads but it was pointed out that delegation creates moral hazard (e.g. the people who own the coins a17:46
gmaxwellren't the people making the consensus, so more incentive to attack and run, who cares if the coins are worthless) undermining the original argument for POS in the first place... would kinda be nice if they addressed that.  It also seems that the existing delegates can just freely block someone new from joining. I can't tell from the page how many are required to jam it.17:46
gmaxwellI mean, it just doesn't have any real substantive information needed to understand any of the edge conditions; maybe some of the links at the bottom are helpful.17:47
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Elielgmaxwell: yes, well organized in depth information is not easy to find.17:58
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Elielgmaxwell: but as for the incentive for the delegates in this case is that they're kind of considered employees of the network and receive income for keeping themselves part of the 101 delegates.17:59
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MRL-Relay[othe] Eliel, Titan is basically just stealth addresses renamed to a fancy marketing name with a flawed aliasing system18:00
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Elielothe: Yes, it's said pretty directly on the wiki page I linked to.18:00
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Elielwell, aside from calling it the aliasing system flawed.18:01
MRL-Relay[othe] it will end like the domain squatting scene18:02
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bramcWhat was meant by dmms and PoS in the above conversation?18:05
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Elielothe: I'd love to see a proper decentralized aliasing system that didn't require global consensus, but it doesn't appear to be a simple problem. The squatting is at least a manageable problem.18:06
MRL-Relay[smooth] bramc dmms is a fancy name for mining18:07
Elielfancy or not, I'd also be curious to know what those letters are initials for :P18:08
bramcandytoshi, I don't understand your question, are you asking why/whether proofs of storage can be used in mining?18:08
MRL-Relay[smooth] Eliel look in sidechains paper, something about distributed multiparty18:08
bramc'dynamic memory multiparty signature'18:08
MRL-Relay[smooth] oh 'dynamic' right18:09
bramcno, 'dynamic membership multiparty signature'18:09
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bramcandytoshi, It's possible to make a PoS system which doesn't get destroyed by grinding, it needs to have proofs of time though and some very careful use of canonicalization18:13
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bramcandytoshi, I read your treatise on altcoins and found your comment about not being able to find a rigorous proof that PoS can't be used amusing. You can't prove what isn't true :-)18:15
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bramcandytoshi, There are caveats of course. There are attacks when someone has a faster proof of time server, and there's some amount of bonus for pooling which can be mitigated but not made zero18:15
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brisquewith regards to the flawed alias system, there's quite a few of them around now.18:25
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gmaxwellthey're easy to implement and sound like useful features. actual utility, not so much.18:29
brisqueI imagine for NXT their key value store will be annoying come pruning time18:30
bramcgmaxwell, But how are you supposed to use bitcoin when you don't have access to a computer?18:31
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phantomcircuitbramc, maths in your head and morse code18:35
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bramcA thought about scaling and raising the block size: As peers get faster with faster connections, if you don't raise the block size limit then wallets could start running full nodes instead of spv nodes18:42
phantomcircuitbramc, the limit is largely cpu power18:43
phantomcircuit32 core system with everything in ram AND signature checks disabled18:44
phantomcircuit~50mbps18:44
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brisquephantomcircuit: tell that to my 70KB/s upload :<18:45
bramcphantomcircuit, All the stuff about raising limits is talking about computers being a lot faster with much faster net connections in the future18:45
phantomcircuitbramc, im not sure assuming consumer cpus are going to get substantially faster is a great bet18:46
brisquesyncing bitcoin core is pretty much single threaded isn't it?18:47
phantomcircuitbrisque, not really18:48
phantomcircuitif you disable signature checks it looks single threaded but is actually just ping ponging between threads18:48
brisquewith checkpoints on, I mean.18:48
brisqueah18:48
gmaxwellbrisque: signature checking is very parallel. The 50mbit/s phantomcircuit is talking about is likely from heap allocator overhead, but thats not that worth addressing because signature checking is a much bigger bottlenext generally.18:48
bramcphantomcircuit, I'm not making the argument! Just pointing out that we're already running up against scaling limits. When people start running full nodes on wallets because it's cheap enough then it's time to think about raising.18:48
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phantomcircuitbramc, oh18:53
phantomcircuitok then18:53
bramcAlthough I haven't heard anyone other than Gavin be particularly enthusiastic about raising the limit18:55
bramcI for one want to see the limit hit so that everybody fixes their shit to be able to handle transaction fees18:56
brisquethere's lots of people on bitcointalk and reddit who support it.18:56
brisqueI saw a lovely diagram that describes anybody who doesn't want 20MB blocks as functionally impaired.18:57
bramcbrisque, My sample is of course a bit warped, being mostly of people who do actual development18:58
bramc'It's liked on reddit and the forums' is not generally a good reason for making technical decisions.18:58
brisqueah here we go. https://i.imgur.com/h7kJDH7.jpg18:59
phantomcircuitbrisque, gavin is literally the only technical person i've ever heard suggest it's a good idea18:59
kanzurebrisque: mto hit the limit then i suggest lowering the block size limit19:02
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kanzurewow i don't now what went wrong there with my message19:03
kanzurebramc: my suggestion for hitting the limit is to lower the block size limit, not increase the block size limit19:03
bramckanzure, I've heard that suggested as well, to force the issues to be fixed before they really really have to be fixed19:04
bramcSounds like a good idea to me, although it is a bit like price fixing by miners, and it requires their collusion, which unfortunately probably won't happen19:05
kanzure*know19:07
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Taekgavin doesn't seem too opposed to the idea of only enthusiests with powerful computers and connections being able to run nodes20:00
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Taekwhich, from a really high level, might be all you need20:04
Luke-JrTaek: once we have decent SPV wallets, maybe20:05
phantomcircuitsooo not anytime soon?20:06
phantomcircuiti dont consider an spv client to be sufficient for that without fraud proofs20:06
phantomcircuitwhich im still not convinced can be done without hugely complex DoS mitigation20:06
TaekYou'd want a fraud proof to propagate in less time than people take to confirm a transaction20:07
Luke-Jrphantomcircuit: I'd want to see at least gitian determinism and a decent UI (in other words, Bitcoin Core quality)20:09
Luke-Jrphantomcircuit: how do you prevent fraud proof DoS?20:09
phantomcircuitLuke-Jr, kill peers that give you bad fraud proofs would be the first thing20:10
bramcWhat do you mean by 'fraud proof'?20:10
phantomcircuitbut it's really just heuristics20:10
Luke-Jrphantomcircuit: no, I meant legit fraud proofs spammed because of real frauds20:10
Luke-Jrbut in this context maybe it doesn't matter20:10
phantomcircuitbramc, evidence that a block violates the rules20:10
Luke-Jrbramc: proof of a better blockchain than the one with the tx20:10
Luke-Jror that20:10
phantomcircuitLuke-Jr, you'd need to make the fraud proofs 1:120:10
phantomcircuitwith the serialization20:11
Luke-Jrhm20:11
bramcIsn't a fraud proof usually a chain back to a conflict?20:11
phantomcircuitit costs something to generate something that would even need to be proven fraudulent20:11
phantomcircuitso there's a limited set of possibilities20:11
* Luke-Jr ponders if a fraud proof for "block too large" would need to be the block size20:11
TaekLuke-Jr: it does not20:12
bramcLuke-Jr, It wouldn't if sizes were included in the hashing-together process20:12
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phantomcircuitLuke-Jr, you'd have to process the entire block20:12
phantomcircuitfun20:12
Luke-Jrbramc: this assumes the block is valid in the first place20:12
Luke-JrI was thinking of using the SHA256 lengths, but those can be forged too20:12
bramcLuke-Jr, If the nodes leading to the transaction root included sizes then there would of necessity be a short proof of a root which lied about total size20:13
TaekIf the leaves of the merkle tree are formed from the hashes of transactions, and you have a minimum legal size for a transaction20:13
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Luke-Jrbramc: what stops it from lying in those steps too? ;)20:13
bramcMaybe I should exhaustively work through all the ways invariants could be violated and how proofs of them could be short20:13
phantomcircuitTaek, doesn't prove anything20:13
phantomcircuitthere's a massive space beyond  min and max20:13
bramcLuke-Jr, If you lie about the size of the root, then either you didn't hash together the two things below it properly, or you lied about the size of one of them20:14
Luke-Jrexactly20:14
Luke-Jrif someone is crafting an invalid block, they *would* do that20:14
Taekhm20:16
Luke-Jrphantomcircuit: it's maybe even impossible to create a fraud proof for a block you've never seen (best chain is not better than the fraud)20:16
Luke-Jrwith that in mind, perhaps the only fraud proof that matters is "I have a better chain"20:16
phantomcircuitLuke-Jr, for an extensive implementation20:18
Taekwhat if the merkle root is a random set of bytes?20:18
Taekhow do you build a fraud proof for that? You can't prove that nothing builds to that hash20:18
phantomcircuityou'd basically just need the merkle tree branch and a "this is broken" possibly with another branch to a conflicting transaction20:18
phantomcircuitexcept for block size limits20:18
phantomcircuiti think you need to have the full block20:19
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Luke-Jrphantomcircuit: but if the fraud chain is longer than the real one, the fraud won't publish his false block20:19
phantomcircuitLuke-Jr, true20:20
phantomcircuitLuke-Jr, eh it's so much easier to parse the full chain over a high bandwidth link20:20
phantomcircuitit's really not that much data :|20:21
Luke-Jrphantomcircuit: original topic was increasing block size :P20:21
phantomcircuiteven then20:21
Luke-JrI don't have a high bandwidth link available.20:21
Luke-Jrand my USB Armory took like a month to IBD :p20:22
phantomcircuitLuke-Jr, eh you'd basically want to do what bitcoin core does if fScriptchecks=false alayws20:23
phantomcircuitalwyaS*20:23
Luke-Jrphantomcircuit: what? convince ghashio to mine with fScriptChecks=false? :D20:24
phantomcircuitand bitcoin cores implementation of that is fast but certainly not optimal20:24
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bramcLuke-Jr, it's always possible to trace it all the way down to the leaf which has the error, and that's a short path20:32
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TaekI'm still stuck on the withholding problem. If 51% mining power decides to withhold information on each block20:32
Luke-Jrbramc: what if that leaf is 1 GB in reality? or not known to anyone?20:33
Taekall of the full nodes will reject the blocks they produce, but all of the SPV nodes will accept them20:33
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bramcOh, yeah, proving 'there's nothing with this hash' is a bit of a problem20:36
bramcBy definition there are infinitely many things with a given hash20:40
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Taekwrt to the recent exit scam, sztorc (truthcoin) proposed that making reputation fungible and sellable is one potential way to prevent exit scams21:00
Taekthe idea being that if you commit an exit scam, your reputation becomes worthless21:01
Taekand you could have made more money by instead just selling it21:01
gmaxwellsee also the very first discussion in this channel with respect to fidelity bonds. Though these schemes have common faults though.21:05
gmaxwellFor example, say ther is some small ding coming on your reputation (e.g. you screwed up and accidentally screwed someone over a bit), suddenly its hugely profitable to sell your reputation to a scammer who will _slam_ as many people as they can as hard and as fast as they can.21:05
Taekbecause the small ding will reduce your reputation by X% and the scammer will be able to make a profit greater than 1-X%?21:12
phantomcircuitnot to mention it's gonna be hard to find a buyer for a darknet admin reputation for 100k+ BTC21:12
Taekother darknet admin hopefuls21:13
bramcfungibility of reputation is generally speaking bad for the value of the reputation21:13
phantomcircuityeah lots of issues with that one21:14
phantomcircuitbut well21:14
phantomcircuitthere's no reason for this to even be possible21:14
phantomcircuitmultisg escrow is a thing that works21:14
gmaxwellTaek: generally reputation hits have to be 'overstated' http://xkcd.com/325/ or they're easily whitewashed out with fair transactions at parity.21:15
TaekI think that would depend on what the reputation is for21:18
Taekif 97% approval means that you can expect to lose 3% of the financial value in your dealings with this party21:18
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Taekthat might be a reasonable risk to take21:18
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gmaxwellI guess you lots tons to pirate40 and aethero (which both had 97% like reputations in bitcoin otc before they vanished with all the moniez)21:20
Taekdid they vanish with less than 3% of all the money that had ever passed through them?21:21
gmaxwellno probably much more...  because the exposure is tail loaded as they hyped up on their snowballing reputation at the end; but even if it was 3%... so? all the people with 100% losses on their trades are not thanking you and using your system again.21:23
* Taek wonders if you could insure this sort of thing21:25
TaekI think any worthwhile reputation system built within the next 5 years would have to be inside of a rather sterile environment21:26
Taekwhich might limit it's initially usefulness, but even Bitcoin was essentially useless for a long time21:27
Taek*initial21:27
gmaxwellWe have rather large reputation systems (otc and btc) each with many hundreds of active users, and in my view they are more or less failures.  One way of looking at your example is, ignoring the tail loading and sybils and such. lets say that it really did mean that you'd lose everything 3% of the trades there, that means you could never trade with that party with positive expectation unless you21:34
gmaxwellplanned to make >3% on the sale... which means in a competative enviroment no one would probably wouldn't trade with them at all.21:34
Taekmy understanding is that otc opens up a market where none otherwise exists21:36
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bramcLet's use this reputation system known as 'banking licenses'21:36
Taekif 3% (+ a 2% fee or whatever) is the only way to get bitcoins, you may decide that 5% overall expected fee is a worthwhile expense21:36
Taekcertainly doesn't compare to Coinbase's 1%21:36
Taekbut Coinbase isn't ubiquitous21:37
gmaxwellTaek: but someone with a 3% negative reputation is 3% distant to everyone using the system. It doesn't matter what they'll accept, I mean they're suffering a 3% disadvantage on any resource that goes into them, and a 3% disadvantage on any that comes out.21:37
gmaxwellSo effectively, except where they have special connectivity they'd just become disconnected from the ecconomy if we really were to optimize this by the numbers and assume rational agents and yadda yadda.21:38
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TaekI don't quite follow. How does a 3% disadvantage on every trade result in a disconnection from the economy?21:41
TaekIt makes sense if you assume that there's a way to avoid the 3% disadvantage21:41
bramc'build a reputation system' generally doesn't work. It only sort of works when there's a highly centralized authority overseeing everything21:41
Taekbramc: I certainly don't have an example of a working reputation system21:42
Taekbut I haven't given up on the idea that one might be possible21:42
bramcebay and amazon's reputations systems work okay21:42
Taek*decentralized reputation system21:43
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gmaxwellI think ebay's only works in that it doesn't have much to do, lots of bitcoiners have been ripped off via ebay. It's not as much of a failure as bitcoin-otc, but its pretty thin protection.21:43
bramcIf you use bitcoin on ebay you're opting out of much of the protections they provide you21:44
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gmaxwellbramc: not bitcoin, but things like mining equipment.21:52
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bramcgmaxwell, 'Had JCF enabled, would not buy again'21:53
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bramcgmaxwell, 'Value per hash immediately dropped after I bought this equipment. Not trustworthy.'22:01
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MRL-Relay[smooth]   /win622:45
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bramcNobody seemed interested in my signature-based approach to supporting lighthouse functionality23:50
nubbins`bummer23:53
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--- Log closed Thu Mar 19 00:00:26 2015

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