2016-04-19.log

--- Log opened Tue Apr 19 00:00:51 2016
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kanzureTaek: proof of consensus rule validity would render the point of sidechains somewhat unnecessary04:29
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instagibbsor like, bitcoin maybe09:24
instagibbsif we're already assuming super fast execution and actually valid implementations/crypto, we probably don't need PoW09:25
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maakuTaek: yeah if you had a compact proof of consensus rule validity, you wouldn't need sidechains. Or bitcoin.09:53
maakuthe sidchains assumption is essentially SPV09:54
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Taekinstagibbs, maaku: I don't think you could escape the work requirement. You would still need some way to pick between two different valid histories10:46
Taekbut you wouldn't need sidechains anymore10:47
TaekI mean, we might also find that these things are achievable for very simplified consensus rules10:47
Taekfor example, we can do certain operations, but those don't include cryptographic signatures10:48
Taekin which case sidechains would still be useful for the more complicated operations that you aren't able to create compact proofs for10:48
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maakuTaek: you won't need bitcoin. If you can have a compact proof of validity of an elided history, there's no reason to have a public ledger at all10:58
maakuThere's much cooler stuff you could do10:58
Taeksure, the ledger doesn't need to be public10:59
Taekbut I think you still need POW to choose between multiple valid histories10:59
Taekwell, you also need some way of knowing that the history being presented to you is the one with the most pow11:00
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Taekor rather, the compact proof for the history, since the history itself is not being revealed11:01
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GreenIsMyPepperTaek: agree 100% with your earlier comment that the primary part which is the most difficult is proving state cocisely without sharing all the data. Ignoring ordering/PoW/etcetcetc, I wonder whether it's sufficient to have many thousands of entities share all state data be conclusively understood as accessible (in other words, how many people are needed to be able to be confident of "infor12:14
GreenIsMyPeppermation wants to be free" when the time comes)12:14
GreenIsMyPepper... i am talking about a "sidechains" or "sidechains-like" construction in thise case12:15
GreenIsMyPepperif you can presume that as true, you can punt a LOT of problems. it's messy in similar ways that PoW is messy, though12:17
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Taekthe problem gets worse if you assume that people are going to be actively trying to censor the information12:23
TaekBitcoin is a good example of 'probably good enough', but I wonder how slim you can make a network before it becomes reasonably possible to censor critical data12:24
GreenIsMyPepperyeah, i'd be interested in the order-of-magnitude ballpark for the number which is effectively uncensorable12:24
GreenIsMyPepper(assuming i.i.d. of participants ;)12:24
GreenIsMyPepperi feel like if that's sufficiently solved, everything else is EZPZ12:25
GreenIsMyPepperhm. ezpz should've been in quotes12:25
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adam3usthe c,s encoding variant of schnorr https://bitcointalk.org/index.php?topic=511074.msg5727641#msg5727641 that looks like R=kG, [c=H(R,m), s=k+cd], Q=dG, verify: c=?H(sG-cQ,m) (which works because kG=sG-cQ) is in part interesting because schnorr claims that you can safely truncate c so you get eg a 48byte instead of 64byte raw signature.15:24
adam3ushowever that claim is based on some dodgy assumptions (eg that the signer is trusted to not try to construct collisions) so that is actually relatively insecure, if you do that the signer with effort 2^64 (which is TMTOable) can create one sig c,s that is valid signature for two different messages m and m'. that might be exploitable in a bitcoin setting.15:27
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adam3usalso the c,s version isnt batch verifiable15:29
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bsm117532Taek, maaku, GreenIsMyPepper: A ZKP for consensus rules would go a long way.  To that end I often wonder what is the hurdle in having hashes and signature verification as ZKP primitives.  Current ZKP's (Garbled Circuts, Snarks) implement hash functions in an incredibly inefficient way, and that is the source of their slowness...18:30
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kanzureer, isn't the slowness also a consequence of a cpu that runs at essentially 1 op/sec? (i don't know what the actual rate is. but it's slow.)18:44
bsm117532Turning logic gates into EC encryptions is a slowdown by a factor of roughly 10,000-100,000...yes.18:45
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bsm117532Also simulating logic gates on a general purpose CPU is another giant slowdown, even without the encryption.18:48
kanzurebsm117532: did you watch https://www.youtube.com/watch?v=Z4jzA6ts2j4 ?18:49
kanzurebsm117532: i typed up the words here http://diyhpl.us/wiki/transcripts/simons-institute/a-wishlist-for-verifiable-computation/18:50
bsm117532Will read.  I hate videos... :-/18:50
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bsm117532Ooooh good link!18:51
bsm117532And he's at NYU, I might have to go pester him...18:51
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bsm117532From the perspective of sharding, at least, I see a way out: different shards append UTXO set commitment proofs to a transaction, and it gets passed around until it has a full set of proofs.  Then it can be committed and all the shards it modifies can validate its inputs.18:54
bsm117532Of course that's only one transaction.  Doesn't help SPV wallets know which chain is better.18:55
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bsm117532kanzure: good talk, didn't have the info I was looking for.  I still hope for further advances.  I'd love to hear a way to make e.g. hashing a ZKP primitive.19:05
* bsm117532 pushes on his braid paper to finish itself...19:05
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bsm117532amiller: Do you have any online talks about honey badger yet, or are you giving any soon that I might attend (NE USA)?19:09
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bsm117532We'd love to invite you to talk about it in NYC.19:10
bsm117532Ok I'm totally trying to get out of doing a careful read of your paper so I can cite you properly.  But the invitation is open nonetheless ;-)19:15
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Taekbsm117532: you still have a data withholding problem. It's not enough for me to be able to see a zkp that the state is a certain way, I need to be able to take that proof and build the next proof that I've changed the state to be a new way20:24
Taekactually, when I put it like that, the challenge doesn't seem so insurmountable20:24
Taekyou have to make sure that the output of the zkp gives you enough to build off of20:24
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molzEmcy, hi.. lol that bot banned a testnet address, but i did post it on a testnet site and they sent you some coin:    http://tbtc.blockr.io/tx/info/85d6c6e5eb4ac2bc58aa2b4010b3b6b670c7f83e2b2e64444c50b2ca5809d72e22:23
Emcyi got rekt22:23
Emcywhats a testnet site22:23
molzi meant testnet faucet:  https://testnet.coinfaucet.eu/en/22:24
Emcynice faucets still exist22:24
molzyup22:25
Emcyhow do i get un b&22:25
molzask midnightmagic to unban you22:25
Emcybit harsh matching testnet addresses :/22:25
Emcyhm the balance is considered available after 1 confirmation22:26
Emcysince when?22:26
molzsince forever?22:27
Emcyit was 622:27
molzyou can spend it after 1 confirm too22:27
molzi just sent you 1 btc22:29
Emcy1 confirm was shown to be nearly as insecure as none22:30
molztrue22:30
Emcywhy are they respendable after 1 now22:30
molzidk22:34
Emcyrly weird22:35
Emcythanks for the coins so22:38
molznp :)22:38
molzyou should test segwit if you want22:38
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molzthere's #segwit-dev channel22:39
molzalso, create CLTV tx's to see how cool they are lol22:39
Emcyi have no earthly idea what segwit is22:40
Emcydoes bitcoin disallow sending coins back to origin address now22:44
Emcyor does the UI completely steer you away from that22:44
molzit doesn't disallow22:44
molzbut we're advised not to reuse addresses22:45
molzbut for testnet who cares22:45
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Emcythe ui completely doesnt show an "origin" address for coins22:48
Emcyi think it used to22:48
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gwillenEmcy: the Core UI never showed 'from' addresses for coins, because that's not really a coherent notion22:55
gwillenif you look at the UTXOs that fed into the transaction creating a particular UTXO in your wallet, there could be more than one, and they needn't have corresponding addresses at all, they could be complex scripts22:56
Emcyhuh i remember getting people to stop sending coins back to addresses they came from being a big deal once22:57
Emcymaybe that was some pool or web wallet thing doing that tho cant remember22:58
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Emcydoes -gen still work23:00
Emcydoesnt seem to be doing anything23:00
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Emcybut its still listed as an option23:01
gwillenis that the flag to do cpu-mining?23:01
gwillenthat was removed ages ago I think23:01
gwillenand yeah core never displayed 'from' addresses but I know blockchain.info did, maybe still does23:01
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Emcyhm it still exists in the cmd line options section23:01
molzyou can do: setgenerate true on the debug console but i doubt you can mine any coin23:03
Emcyon testnet?23:04
molzyea23:05
molz "difficulty": 2341243.666283378,   (on testnet, impossible to cpu mine)23:07
Emcydoesnt do anything anyway23:08
molzi think some mining companies put their old asics on testnet23:10
Emcyare asics mature yet23:11
molzi have no clue23:11
Emcythe asic market was doomed to be a funhouse until process nodes approached the state of the art23:11
Emcylibsekp256k1 is used for both signing and validation now right23:17
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molzoh now testnet difficulty is reset to 1, i guess you can mine then :)23:17
Emcyseemed an assload faster than i remember to sync23:17
molzyes i think so23:17
molzopenssl is gone23:17
Emcyyay23:17
Emcyshame the cpu market is stagnant as a bog23:18
Emcymaybe amds new thing will kick the standard up to 8 cores finally23:19
Emcymolz did you send that 1 testcoin with no fee23:23
molzoh.. yes i did.. lol..23:24
molzwhat happened.. i set zero fee to test earlier23:24
molzto see if the coin would be stuck but on testnet it's not like mainnet23:25
Emcyseems like it has missed a few blox23:25
molzoh no23:25
molzit's still unconfirmed23:26
molzsorry i forgot to look at that before sending it23:26
molzlet me see if i can push it23:26
Emcyhow can u push it23:26
molzyou copy and paste the raw transaction here to push:  http://tbtc.blockr.io/tx/push23:27
molzweird earlier i sent a zero fee tx and it went fine23:28
Emcythats just reboradcasting23:29
Emcydid they do the increasing the fee thing yet23:30
Emcystuck coins are a plague23:30
molzok forget that tx, i'm sending you another tx23:33
Emcydifferent coins?23:34
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molzya from a different wallet23:41
molzwe now have "abandontransaction" but it doesn't work well, maybe in the next version it will23:42
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waxwingguys, any reason you're not having this discussion in #bitcoin? not the right place here23:43
molzsorry he's banned from there but i'm done23:43
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Emcyi got to bounce anyway23:44
molzthere's gotta be another bitcoin channel for our normal discussions like this without any ops23:45
waxwingmolz: ##bitcoin23:46
molzno thanks, waxwing that channel is for scums23:46
waxwingoh, well it has ops. other than that why not PM?!23:46
molzbecause there're things i might not know and someone else can help us?23:46
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