2016-01-23.log

--- Log opened Sat Jan 23 00:00:12 2016
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kang_cuckoo : a memory-bound graph-theoretic proof-of-work system https://github.com/tromp/cuckoo04:02
fluffyponykang_: been discussed here many times, tromp_ is a regular a participant in this channel04:25
kang_I realized04:25
kang_Sorry. Is it really trivial to verify?04:26
kang_How can a solution to TSP be trivial to verify?04:26
fluffyponyit's outside my wheelhouse, but I'm sure when he's around tromp_ will comment04:27
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tromp__it's not TSP; it's a cycle of 42 edges08:24
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tromp__it's trivial to check whether 42 given edges form a cycle08:25
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tromp__cuckoo cycle just appeared on Hacker News at https://news.ycombinator.com/item?id=1095776508:26
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AdrianGnice09:26
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maakuLuke-Jr: that was in sipa's original segwit presentation (backpointers, an idea due to rusty)09:58
maakuit's not yet in the segwit branch09:59
maakutromp__: how mature is the cuckoo codebase?10:00
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Luke-Jrmaaku: yet? :x10:40
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maakuLuke-Jr: patches welcome11:26
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wallet42maaku: what kind of backpointers?11:31
maakuwallet42: a merkle tree of the block nth block, mth transaction where the output being spent originated11:33
maakuit's actually quite trivial, probably a dozen lines of code11:34
maakuthe merkle sum tree of fees is only slightly more complicated11:36
maakuLuke-Jr: is you patricia trie implementation in C hosted anywhere?11:37
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Luke-Jrmaaku: never got it finished still :<11:38
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zookolaptopmaaku: what do you want a patricia trie for?11:40
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zookomaaku: I mean, I see it is for this backpointer index thingie.11:40
zookomaaku: but I don't know -- is this something you'd need to deploy to others, integrate into bitcoin-core or anything like that?11:41
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maakuno it is not for that, unrelated request :)11:59
maakuit is not consensus code (for bitcoin, anyway)12:00
zookoHow important is concrete performance?12:02
zookoI've had great success using Judy Trees for some computational linguistics hacking with my then-wife.12:02
zookoPerformed beautifully.12:03
tromp__maaku: somewhat mature in terms of performance. but written in my overly concise and underdocumented style.12:03
gmaxwellzooko: just don't read the source code for libjudy.12:03
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zookogmaxwell: oh I know.12:09
zookogmaxwell: that's why I asked what the purpose of this was before recommending it. :-)12:09
maakuzooko: it woud be for consensus code (merged mining, among other things) just not on bitcoin core12:11
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maakuso clean and concise is preferred :)12:11
zookomaaku: ooh, ok.12:12
zookoThen I do not recommend libjudy.12:12
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zookoI wonder what *is* the cleanest, simplest implementation of some kind of nice tree structure for such a purpose…12:16
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tromp__btw, earlier versions of my Go counting code used judy arrays13:06
tromp__back when the data sets all fit in main memory13:07
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maakuzooko yeah I'm assuming we'll have to roll our own13:22
maakuI didn't find anything in my previous search13:23
zookoWhat programming language?13:24
Guest76435I'm currently working on a patricia trie https://github.com/bramcohen/MerkleSet13:25
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bramcNot sure what a judy tee is13:27
gmaxwella radix-256 trie with an implementation that is something like 30k lines of highly macrofied C code. :) Pretty fast though.13:29
zookogmaxwell: it's not *just* a radix-256 trie, either... It switches among representations at each node based on the density of that node's population ...13:35
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bramcThis sounds similar to what I'm doing, but I'm being much cruder and simpler about it13:40
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bramcWhat I'm doing is a patricia trie, and has different representations but there are only two: branch and leaf13:41
zooko*nod*13:42
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zookobramc: https://github.com/bramcohen/MerkleSet/blob/master/merkle_set.py Cool! ☺14:03
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bramczooko, Note that that file isn't done being written yet, much less debugged, but the comment at the top explaining the data format is fairly comprehensive, if a bit ad-hoc in its notation.14:12
zooko*nod*14:13
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ebfullwhat is the most common `vin` arity for a bitcoin transaction in practice? is there a tool equipt to calculate that easily via the blockchain?18:34
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ebfulloops meant to ask that in #bitcoin-dev18:35
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kanzure"E.g., instead of using PoW to designate the winner, use the hash of the last block to appoint the decider of the next block.  If you can get the hash to be truly unpredictable (e.g., I can't frontrun myself by pre-predicting myself as the winner) then a more perfectly distributed lottery would remove the need for energy burning at all."19:27
kanzure(from ian grigg)19:27
kanzurebut.... then you still need sybil resistance. so i'm not sure what he's thinking.19:27
bsm1175321 You have to be sure the selected node is online.19:29
bsm1175321And I can get the hash to favor me (statistically), by submitting transactions.19:30
bsm1175321The ex-post-facto block publication mechanism of bitcoin is a significant advantage in a byzantine enviroment.  Sounds like he's advocating something closer to traditional leader election, which is best left to non-byzantine environments.19:31
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bramcIn proof of stake you inherently have a tradeoff with functioning while peers are offline. If you want to be able to function with only x% online then you have a serious risk that something greater than x% will do retroactive re-mining, especially if you get into a state where there really is only x% online19:32
bramcIn practice it seems that most cow systems are completely controlled by one entity who stays online all the time, so problem solved.19:33
adlaiCoW?19:33
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tromp__CoW == proof of steak in Cohenese19:45
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bramcUpdate on the stuff I was babbling about yesterday: I've now consolidated is_included() and is_included_make_proof() to both use the same underlying function. It's only a few lines of code to support the optimized but still not great is_included() without proof, so I'm not sweating it any more.20:14
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catfishwhat do I need to start minining bitcoins21:58
catfishor how can I start earning bitcoins21:58
bramccatfish, Ask in #bitcoin21:59
catfishk thanks22:02
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coinoperatedtromp__ Proof of Steak is also, technically, Cohenese22:42
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RoboTeddytromp__: are you the L19 Tromp?23:20
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fluffyponyRoboTeddy: he is23:34
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RoboTeddytromp__: congratulations then :)23:39
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