2016-06-16.log

--- Log opened Thu Jun 16 00:00:31 2016
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bsm117532maaku: It's coming...07:00
bsm117532gmaxwell: The idea is that the verification step is included in my calculation of latency, and miners wouldn't be punished for it.07:01
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PeterRBob: regarding which distribution to use for block propagation times, did you see the distributions in our Xthin article?10:30
PeterRhttps://medium.com/@peter_r/towards-massive-on-chain-scaling-block-propagation-results-with-xthin-a0f1e3c2391910:30
PeterRLognormal fits the empirical data fairly well (although the tails were fatter than even lognormal).10:30
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PeterRNote that we were measuring only a single "hop."10:37
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bsm1175321PeterR thanks, lognormal is no surprise, I'll add it as an option.  Also it's the one-hop distribution I need, and I will sample it on each hop.10:43
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katu_what is this shit about GFW, do they really drop bitcoin connections?[1~11:05
katu_to me the problem with china seems like their state telecoms dont peer with outside world[1;5C[1;5C11:06
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fluffyponykatu_: #bitcoin-dev11:11
kanzure"Breaking symmetric cryptosystems using quantum period finding" https://arxiv.org/abs/1602.0597311:12
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bavlyhey ?11:45
bavlyi need help please11:45
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Taekdon't ask to ask just ask11:54
PeterRkatu_: I'm not sure what the underlying mechanism is, but blocks propagate through the GFC significantly slower than across the normal P2P.11:55
PeterRWe present a bunch of pertinent data here:11:55
PeterRhttps://medium.com/@peter_r/towards-massive-on-chain-scaling-block-propagation-results-with-xthin-792a752c14c211:55
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katu_PeterR: the mechanism is crap and expensive HK bandwidth11:56
katu_because asia11:56
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bavlyi have a wallet on bitcoin core . and although i am sure that some one sent to my addres bitcoins they dont appear in balance or even pending11:57
PeterRWhat I thought was interesting was that the GFC slowed down Xthin blocks by a smaller factor than it slowed down standard blocks.11:57
fluffyponybavly: ask in #bitcoin, this is for discussing theoretical cryptocurrency ideas11:57
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katu_PeterR: there are workarounds of course, like partitioning the blocks among many peers and let them bypass the narrow gullet11:58
PeterRkatu_: agreed.  @thezerg is working on some similar ideas right now.11:59
katu_PeterR: very good sample data is torrents with high chinese peer presence. each individual peer can push like 5kb/s internationally (even if it gets fttx speeds on mainland). but bittorrent overcomes it easily, it simply talks to 200 peers.12:01
katu_anyhow, i'm not a big fan of hacks like that as they depend on highly diversified p2p network, which bitcoin sadly is not (compared to bittorrent).12:05
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katu_i wonder what happened to blockheader-first and set reconcilation proposals12:06
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PeterRDid you see the Xthin results I just linked?  Xthin blocks made it through the GFC about 10 times faster than standard blocks.12:06
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katu_PeterR: i cant read the log graph very well, whats the mean avg?12:08
katu_my mean average latency from europe to most of china is 350ms, so it should be around that number.12:09
PeterR17.4 seconds (std. blocks) versus 1.8 seconds (Xthin)12:09
PeterRIt's what's shown in the first figure in the article.12:09
PeterRThe *median* time for Xthin through the GFC was 0.66 sec.12:10
PeterRThe mean is a lot longer than the median because of the ~lognormal distribution.12:10
katu_thats pretty decent for a federated network12:11
PeterRThanks.  We were quite pleased with the results.12:11
katu_still, true bittorrent-like partitioning can get near true network latency provided you get sufficient amount of nodes on both sides12:11
PeterRAgreed.12:11
katu_(and i kinda like the idea of federated transport as an intermediary solution). though i'd organize your PR a bit differently.12:12
katu_ie directly ask pools for small cut according to measured orphan rate you reduced12:13
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PeterRYes!12:13
PeterRI was brainstorming ideas like this yesterday.12:13
PeterRI think it could be made to work somehow...12:13
katu_anyhow, gmaxwell apparently hates your guts12:14
katu_so theres a chance core will be fixed to do something smarter than it currently does12:15
katu_destroying your business model in the process12:15
katu_its a risky enterprise :)12:15
katu_(but ultimately with good outcome for bitcoin either way, so kudoz to you :)12:16
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PeterRHaha the only pay off I'm looking for is the smile on my face when that first 1.1 MB block gets mined.12:18
katu_wait, is this endeavor part of core/classic drama?12:18
* katu_ had the impression both had the same slow blockprop12:19
PeterRXthin has been part of Bitcoin Unlimited since March and is now part of XT too.12:19
PeterRThere is an experimental branch of Classic that supports it, but the main Classic client does not (at the moment)12:20
katu_oh, you do primitive set recon12:23
katu_i thought you were merely a relay network12:23
katu_PeterR: any plans for true IBF epstein set recon?12:23
katu_i think it was12:24
katu_.t https://www.ics.uci.edu/~eppstein/pubs/EppGooUye-SIGCOMM-11.pdf12:24
yoleauxkatu_: Sorry, I don't know what timezone that is. If in doubt, see https://en.wikipedia.org/wiki/List_of_tz_database_time_zones for a list of options.12:24
katu_bah12:24
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katu_hmm, apparently old topic, https://gist.github.com/gavinandresen/e20c3b5a1d4b97f79ac212:25
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PeterRPersonally, I think Xthin + subchains + optimistic mining (headers first) will give us all the scaling we need.12:26
katu_personally, i trust gmaxwell on this, optimistic mining assumes everyone behaves rationally within bitcoin closed system12:27
katu_but thats an assumption too weak12:27
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PeterRBut optimisitic mining results in a small profitability advantage for a miner.  How do you stop them from doing it?12:27
instagibbskatu_, I've become more pessimistic re:IBLT and the like12:28
instagibbsobviously mempool sync is nice12:28
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instagibbsMatt has a new relay network up and running which does UDP+FEC for latency reduction(plus gossip for mempool). Something like that seems to be the best bet.12:29
instagibbsit's not p2p though, more work would be needed for that12:29
Taekyou can solve the optimistic mining problem by allowing conflicting transactions to appear in a block (and ignoring them). This breaks SPV, but there are some latency based methods of fixing it12:29
instagibbs(you can't just relay data willy nilly, actually have to validate or get DoS banned)12:29
Taekfor example, in the coinbase transaction you could include the merkle root of all valid transaction in the block 3 blocks back12:30
instagibbsTaek, I thought the DAG Days were over ;) another one12:30
TaekI'm pretty convinced that a dag construction is superior in most ways12:30
PeterRStill waiting to read Bob's paper :D12:31
Taekand I'm also convinced that, if SPV is a blocking factor, there are simple ways to bring it back12:31
instagibbsTaek, I do not believe a tree is the best thing, surely :)12:32
TaekI am curious what your doubts are12:32
bsm1175321SPV is straightforward if you can organize things into blocks from the DAG, that's what my "cohorts" are.12:32
instagibbstree meaning the chain we have now12:32
Taekoh12:32
Taekeven if you are using a chain, you can still enable safe opportunistic mining without breaking SPV12:33
instagibbsI think some sort of DAG like thing plus miners not being in charge of validation is best. But that's still, erm, unbaked12:33
Taekyou just add a few blocks of latency12:33
Taekwell, and it's a hardfork12:33
Taekunless you do 'segregatedtransaction' :)12:33
katu_instagibbs: simplest solution would be just to punish miners who intentionally break the network with selfish / "optimistic" mining. that way the dynamic system can be reduced to the most simple game theoretic model where everybody loses.12:34
katu_and the incentive is to simply build robust relaying.12:34
katu_sadly the punishment does not work that well in practice12:34
katu_miners still mine on spv pools etc :/12:34
PeterRkatu_: I don't see optimisitic mining as a problem to be "solved" (I see it as a positive).  What exactly are you worried about?  That miners will stop validating *completely*?12:35
katu_PeterR: remind me what optimistic means again. mining on top of a tip you didnt verify "optimistically" ?12:38
PeterRIt means you would start mining once you've received the block header and verified the PoW but before you've downloaded and verified all the transactions.12:39
katu_it simply breaks core assumptions that double spenders cant hijack hashpower for their attempt, not even temporarily. it still effectively boosts hashpower of attempted doublespend.12:39
PeterRYou set a timer and STOP optimistic mining if you don't verify the complete block by the deadline12:39
katu_yes.12:39
katu_and that time period is hijacked hashpower12:39
katu_the longer the deadline, the worse it gets. i agree that short deadlinse (<100ms) wouldnt matter much12:40
PeterRYes, that is a valid point.  I'd like to see the math for this, however.  I bet it comes out as insignificant for any reasonable optimistic-mining time period.12:41
katu_but past second it starts to feel uncomfortable12:41
katu_thats 1/600 of a big chinese pool for me, yay12:41
PeterRI was thinking about 6 sec (1%).12:41
PeterRBut I don't have any math to back that up...just gut feel.12:42
PeterRMaybe I'll try to analyze this properly....12:42
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katu_PeterR: granted, this concerns 1-conf transactions for the most part, but might break some more complex assumptions (ie parasitic chains, contracts)12:43
PeterRYes.12:43
PeterROk got to get back to work.  Thanks for the chat!12:44
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nicolagrecoexit12:54
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nicolagcan anyone help me understand Async Common Subset?12:55
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midnightmagicnot really sure why rizun is welcome here given the fairly extreme provocation and promotion of cartoons of people being killed.14:13
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fluffyponyI felt it prudent to keep quiet, katu_ was doing just fine in defense of secure system design :-P14:16
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dgenr8lognormal propagation is much simpler to work with than the alternatives i looked at. it's a bit hard to justify though - often it arises from a multiplicative sequence, and how does that model t(one network hop)?15:21
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dgenr8katu_: optimistic miners build empty blocks, so no help to double spenders15:26
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bsm1175321dgenr8: I have a network simulation for braids, latencies are calculated as distances on the surface of a sphere.  I'm just inserting an additional delay drawn from a lognormal distribution to model the long-tails of real-world propagation.15:33
katu_dgenr8: the offending transaction is already embedded in the block prior on which optimistic miners blindly mine on, thus lending him more hashpower.15:37
katu_my assumption is they also blindly broadcast without waiting for the block to verify.15:38
katu_(sadly i couldnt find concise description of what xthin actually _does_, thus i'm assuming the worst)15:41
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katu_in case it witholds the block, attack surface is smaller, but still exists - winning hashes are semi-public for pools. it becomes non-technical debate whether or not individual miners would leak those, again, something im not entirely comfortable with.15:55
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PeterRkatu_: there's a diagram and a brief description of how Xthin works in Fig. 1 here:16:41
PeterRhttps://medium.com/@peter_r/towards-massive-on-chain-scaling-presenting-our-block-propagation-results-with-xthin-da54e55dc0e416:41
PeterRAnd here is the original Xthin BUIP by Peter Tschipper:16:41
PeterRhttps://bitco.in/forum/threads/buip010-passed-xtreme-thinblocks.774/16:41
PeterRXthin is unrelated to optimistic mining.16:42
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slackircbridge1<dts> He's really trying to Orwell the SPV mining as "optimistic mining"19:33
slackircbridge1<dts> What a total douche19:33
nsh(personal comments are off-topic)19:38
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slackircbridge1<dts> woah how did he see what I said19:50
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