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joined #bitcoin-wizards 05:47 -!- Sosumi [~Leon@bl10-113-190.dsl.telepac.pt] has joined #bitcoin-wizards 05:47 -!- ruby32 [~ruby32@ool-43579aa4.dyn.optonline.net] has quit [Remote host closed the connection] 05:48 -!- ruby32 [~ruby32@ool-43579aa4.dyn.optonline.net] has joined #bitcoin-wizards 05:49 -!- pro [~pro@unaffiliated/pro] has joined #bitcoin-wizards 05:51 -!- sn0wmonster [~yeti@taskhive/developer/sn0wmonster] has joined #bitcoin-wizards 05:51 -!- _mn3monic [~guido@176.9.68.68] has joined #bitcoin-wizards 05:52 < andytoshi> tromp_: assuming equal difficulty, to dominate N-1 blocks (plus your own) requires hitting a target 1/Nth the size of the single-block target 06:00 -!- ryanofsky [~russ@static-100-38-11-146.nycmny.fios.verizon.net] has quit [Remote host closed the connection] 06:02 -!- laurentmt [~Thunderbi@176.158.157.202] has joined #bitcoin-wizards 06:05 -!- laurentmt [~Thunderbi@176.158.157.202] has quit [Client Quit] 06:08 -!- Yogh [~Yogh@f36186.upc-f.chello.nl] has joined #bitcoin-wizards 06:27 < tromp_> hi andytoshi 06:27 < tromp_> that assumes a different notion of dominating than what i understood 06:28 < tromp_> where the previous N-1 blocks did work exactly matching the target 06:29 -!- Yogh [~Yogh@f36186.upc-f.chello.nl] has quit [Quit: ZNC 1.6.3 - http://znc.in] 06:30 < tromp_> where the previous N-1 blocks did work exactly matching the target 06:30 < tromp_> the total target work proven by only following direct 06:30 < tromp_> predecessor links 06:31 < tromp_> i see now. that phrase says you ignore how much the predecessors improved on the target 06:32 -!- Newyorkadam [~Newyorkad@wikipedia/Newyorkadam] has joined #bitcoin-wizards 06:32 < tromp_> sorry for paste error 06:32 -!- Newyorkadam [~Newyorkad@wikipedia/Newyorkadam] has quit [Client Quit] 06:32 -!- ryanofsky [russ@2600:3c03::f03c:91ff:fe55:105d] has joined #bitcoin-wizards 06:33 < tromp_> note that this skipping is different from the one in your paper with "effective difficulty" 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btiefert [~omniden@70.196.134.249] has quit [Client Quit] 10:50 -!- btiefert [~omniden@249.sub-70-196-134.myvzw.com] has joined #bitcoin-wizards 10:50 -!- BashCo [~BashCo@unaffiliated/bashco] has joined #bitcoin-wizards 10:51 -!- btiefert [~omniden@249.sub-70-196-134.myvzw.com] has quit [Client Quit] 10:55 -!- molz_ [~molly@unaffiliated/molly] has joined #bitcoin-wizards 10:58 -!- mol [~molly@unaffiliated/molly] has quit [Ping timeout: 255 seconds] 10:59 -!- Giszmo [~leo@pc-240-13-215-201.cm.vtr.net] has quit [Ping timeout: 240 seconds] 11:01 -!- Guyver2 [~Guyver2@guyver2.xs4all.nl] has joined #bitcoin-wizards 11:02 -!- Guyver2_ [~Guyver2@guyver2.xs4all.nl] has joined #bitcoin-wizards 11:04 -!- Guyver2 [~Guyver2@guyver2.xs4all.nl] has quit [Disconnected by services] 11:05 -!- Guyver2_ is now known as Guyver2 11:15 < andytoshi> tromp_: yeah, i understand now 11:15 < andytoshi> the skipping is definitely different but i had thought the same proof would hold 11:23 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has joined #bitcoin-wizards 11:26 < tromp_> your paper also glosses over the possibility of infinite effective difficulty for hash==0 :( 11:27 < andytoshi> yes, it does, somebody gets a hash very close to zero it's a safe assumption the random oracle model has broken down for this hash anyway 11:30 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has quit [Ping timeout: 260 seconds] 11:38 -!- CrazyLoaf [uid67551@gateway/web/irccloud.com/x-qpxvffifvilbykxa] has joined #bitcoin-wizards 11:42 < tromp_> i still like the idea of committing to a compact chain, althought its uses are not quite clear to me, beyond informing the user like "branch ... claimed cumulative difficulty ... verified effective difficulty ... giving correlation ... " 11:42 -!- davec [~davec@cpe-24-243-249-218.hot.res.rr.com] has quit [Ping timeout: 260 seconds] 11:44 -!- davec [~davec@cpe-24-243-249-218.hot.res.rr.com] has joined #bitcoin-wizards 11:46 < tromp_> perhaps correlation is the wrong notion. one could compute the odds that the given the verified eff. diff. what are the oods of having at least the claimed cumulative difficulty 11:48 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has joined #bitcoin-wizards 11:55 -!- execute [~execute@52.68.0.151] has joined #bitcoin-wizards 11:56 -!- Giszmo [~leo@pc-240-13-215-201.cm.vtr.net] has joined #bitcoin-wizards 11:58 < andytoshi> tromp_: the use is that you don't have consensus failures in the case that people drop blocks 12:01 -!- q4 [~q4@user-94-254-231-57.play-internet.pl] has joined #bitcoin-wizards 12:01 -!- Giszmo [~leo@pc-240-13-215-201.cm.vtr.net] has quit [Client Quit] 12:01 -!- Giszmo [~leo@ip-203-233.219.201.nextelmovil.cl] has joined #bitcoin-wizards 12:04 -!- Giszmo1 [~leo@pc-240-13-215-201.cm.vtr.net] has joined #bitcoin-wizards 12:06 -!- Giszmo [~leo@ip-203-233.219.201.nextelmovil.cl] has quit [Ping timeout: 260 seconds] 12:07 -!- Giszmo [~leo@ip-145-233.219.201.nextelmovil.cl] has joined #bitcoin-wizards 12:10 -!- mol [~molly@unaffiliated/molly] has joined #bitcoin-wizards 12:10 -!- Giszmo1 [~leo@pc-240-13-215-201.cm.vtr.net] has quit [Ping timeout: 260 seconds] 12:11 -!- mol [~molly@unaffiliated/molly] has quit [Remote host closed the connection] 12:12 -!- mol [~molly@unaffiliated/molly] has joined #bitcoin-wizards 12:12 -!- molz_ [~molly@unaffiliated/molly] has quit [Ping timeout: 240 seconds] 12:13 -!- JHistone [~JHistone@lab.edinburghhacklab.com] has joined #bitcoin-wizards 12:14 -!- EvilHero_ [~EvilHero@208.77.77.34] has joined #bitcoin-wizards 12:20 < tromp_> i don't know what you mean by dropping blocks 12:20 < andytoshi> tromp_: i mean in mimblewimble my design had been that blocks outside of the compact chain would be deleted by full nodes 12:21 < andytoshi> so if there wasn't a canonical chain, somebody could show up with blocks referencing old blocks that no longer existed, and this would cause trouble 12:22 < tromp_> i dont see full nodes making use of compact chains 12:23 < andytoshi> in the mimblewimble paper this was the design 12:23 < andytoshi> because they had no need for any additional data 12:23 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has quit [Ping timeout: 240 seconds] 12:24 < tromp_> full nodes need to be sure of highest work branch by checking all blocks pow 12:25 < andytoshi> if my lemma had been correct the compact chain would have been sufficient. as it is, i still think a factor of 2 somewhere in there will fix it 12:26 < andytoshi> they don't need to be sure of the highest work branch, they only need the statistical properties of the highest-work compact chain to be such that rewriting is as hard as writing 12:27 < andytoshi> same as a full blockchain 12:27 < tromp_> i don't hink that's fixable 12:27 < andytoshi> why doesn't defining a 1/2 into to the definition of effective difficulty fix it? 12:28 < tromp_> i will ponder that separately, but i mean full node needs more than statistical assurance 12:28 < andytoshi> they already have only statistical assurance in bitcoin 12:28 < andytoshi> you can get lucky and mine a million blocks in a million hashes, in principle 12:30 < tromp_> yes, but that will be an actual valid chain 12:30 < tromp_> while a lucky compact chain need not be part of an actual valid chain 12:30 < andytoshi> that's fine 12:31 < andytoshi> we can define a compact chain to be just as valid as a full chain, then as long as there's no work advantage to "mining" a compact chain directly, it's fine 12:32 < tromp_> surely a compact chain can only be valid if part of a prev-block chain?! 12:33 < andytoshi> no 12:33 < andytoshi> this is the point of all the sinking signature stuff 12:33 < andytoshi> you only need the compact chain to validate the whole history 12:34 < tromp_> i must admit i've been skipping the sinking signatures as being a little beyond me for now 12:34 < andytoshi> no worries, the paper has a ton of technical stuff that isn't super necessary .. but what is necessary is to know that it allows compressing blocks together 12:35 < andytoshi> but after doing this, you need your commitments and proven work to still be sensible 12:35 < andytoshi> so i did this compact chain thing, and said that each block can skip a ton of other blocks (and commit to the compressed aggregate of all the skipped blocks) 12:36 < andytoshi> which winds up being like log(n_skipped_blocks)^2 in size or something 12:37 < tromp_> so you're actually changing the longest chain rule. from most cumul diff to most effective diff on compact chain 12:37 < andytoshi> yeah 12:37 < andytoshi> section 3.3.2 talks about the consequences of this 12:37 < tromp_> and not requiring prev block hashing to be witnessable 12:38 < andytoshi> yep 12:38 < andytoshi> it is definitely a formal weakening of the security model 12:38 < andytoshi> but i argue that it's just as good, for all intents and purposes, in that section 12:40 < tromp_> btw, is there any more recent version of that paper than last october or so? 12:40 < andytoshi> no, sorry 12:40 -!- gHEr [~JHistone@lab.edinburghhacklab.com] has joined #bitcoin-wizards 12:41 < andytoshi> i've moved away from the sinking signatures (and therefore compact chains) because they break my payment channel/scriptless script stuff 12:42 -!- gigq [~gigq@2602:302:d14c:51a0:a968:eac1:59e2:dcd3] has quit [Ping timeout: 256 seconds] 12:42 < tromp_> why do compact chains require different kind of signatures? 12:42 < andytoshi> because only sinking signatures can be aggregated across blocks the way that i needed 12:43 < tromp_> does the paper explain why that fails with the regular sigs? 12:43 -!- gigq [~gigq@2602:302:d14c:51a0:240a:b0b4:a079:e447] has joined #bitcoin-wizards 12:44 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has joined #bitcoin-wizards 12:44 -!- JHistone [~JHistone@lab.edinburghhacklab.com] has quit [Ping timeout: 240 seconds] 12:44 < andytoshi> not directly .. defn 4 says that a sinking sig is one that can be aggregated with sigs from previous blocks but not from future ones 12:44 < andytoshi> which is the reason 12:45 < andytoshi> basically aggregation usually gets you negation, which in mimblewimble is sufficient to reverse transactions (swap inputs and outputs and negate the kernel signature) 12:46 < andytoshi> ECDSA sigs can't be aggregated, schnorr sigs only get you a 50% space reduction, BLS sigs on same message can be aggregated in constant space but allow negation 12:47 -!- cluelessperson [~cluelessp@unaffiliated/cluelessperson] has quit [Ping timeout: 240 seconds] 12:47 < andytoshi> so, you can get aggregation within a block by having BLS sigs that sign the current blockheight, this lets you compress every kernel into a single point and every sig into a single sig, which is cool 12:48 < andytoshi> sinking sigs are BLS sigs that separately sign the current blockheight and a bunch of previous blockheights 12:48 < andytoshi> so by dropping the higher blockheights you can "migrate" them to earlier blocks, where they can be aggregated, but not to later ones 12:49 < tromp_> is BLS the type based on pairings? 12:49 < andytoshi> yep 12:50 -!- moli_ [~molly@unaffiliated/molly] has joined #bitcoin-wizards 12:52 -!- mol [~molly@unaffiliated/molly] has quit [Ping timeout: 240 seconds] 12:52 < tromp_> do schnorr signatures allow reversal of tx? 12:52 < andytoshi> no 12:52 < tromp_> is that equivalent to ECDLP? 12:53 < andytoshi> they also don't allow much aggregation (you can reduce a bunch of 64-byte sigs to a bunch of 32-byte ones plus one extra point) 12:53 < andytoshi> yes 12:53 -!- mol [~molly@unaffiliated/molly] has joined #bitcoin-wizards 12:53 < andytoshi> BLS sigs i believe reduce to CDH (or something analogous when the paired groups are different) 12:54 < tromp_> i'm suspicious of pairing crypto. even though i'm no cryptographer by any means:( 12:54 < andytoshi> if it helps, so is adam :) 12:54 < tromp_> just don't feel comfortable with something that is MUCH less stress tested than EC 12:55 < andytoshi> that is another motivation for me to explore other directions .. the pairing dependency is annoying 12:56 < tromp_> is it possible that ppl will find new ways to aggragate shnorr sigs, giving much more than 50% ? 12:56 -!- Sosumi [~Leon@bl10-113-190.dsl.telepac.pt] has quit [Quit: Bye] 12:56 -!- moli_ [~molly@unaffiliated/molly] has quit [Ping timeout: 240 seconds] 12:57 < andytoshi> pretty sure not (without interaction) because their security depends on a random hash messing up the linear algebra 12:57 -!- gHEr [~JHistone@lab.edinburghhacklab.com] has quit [Ping timeout: 240 seconds] 12:57 < tromp_> i mean, the ring sigs play some pretty neat trick with those hashes as well... 12:58 < andytoshi> very true 12:58 -!- Giszmo [~leo@ip-145-233.219.201.nextelmovil.cl] has quit [Ping timeout: 255 seconds] 12:58 < tromp_> but i agree aggregation starts from seemingly completely independet things 12:58 < tromp_> that leave much less room for tricks 12:59 < andytoshi> yeah. and it's been a more popular area of study for the last 20 years than have ringsigs or rangeproofs 13:00 < tromp_> btw, aggregation across blocks may be more beneficial for dropping rangeproofs than for copmacting sigs 13:01 < andytoshi> well, the rangeproofs can already be dropped when they're redundant 13:01 < andytoshi> err, when they are attached to spent outputs 13:01 < tromp_> not for new clients though 13:01 < andytoshi> and cannot be when they are attached to unspent outputs, regardless of the rest of the chain 13:01 < andytoshi> yes they can 13:02 < tromp_> oh, new clients only verify utxo... 13:02 < andytoshi> yes, all the non-utxo stuff is verified by checking the kernel sigs (which are sinking sigs in the paper) 13:10 < tromp_> to verify a coimpact chain, dont you need all the dropped blocks to check that effectively difficulty is computed correctly? 13:10 -!- rusty2 [~rusty@pdpc/supporter/bronze/rusty] has quit [Ping timeout: 255 seconds] 13:13 < andytoshi> no, this is the point of the difficulty sumtree 13:13 < andytoshi> oh, you mean that the diffchanges are handled right? 13:13 < tromp_> i mean accumulation of dropped difficulties must be verified 13:14 < andytoshi> you don't need to know that past diffchanges were done correctly except for anti-DoS 13:14 < andytoshi> accumulation is handled by the sumtree 13:14 < tromp_> but your sumtree is only on compact blocks 13:14 -!- Giszmo [~leo@ip-228-233.219.201.nextelmovil.cl] has joined #bitcoin-wizards 13:14 < andytoshi> yes, that's fine 13:14 < tromp_> whose leaves have effetive difficulty up to twice their actual difficulty 13:15 < andytoshi> because of your problem with my lemma? 13:15 < tromp_> just using your definition of effective difficulty 13:15 < andytoshi> then we weight effective difficulty by 1/2 vs actual difficulty 13:16 < andytoshi> i'm confused, what do you mean by "actual difficulty" 13:16 -!- Guyver2_ [~Guyver2@guyver2.xs4all.nl] has joined #bitcoin-wizards 13:16 < tromp_> let's assume constant target T 13:17 < tromp_> and consider luck levels log_2 (T/hash) 13:17 < tromp_> you would reduce a chain 0 0 0 0 0 0 0 3 to just 3 13:18 < tromp_> actually lets forget the log_2 13:18 < tromp_> and reduce 1 1 1 1 1 1 1 8 to just 8 13:18 < tromp_> sorry to just 15 13:19 < tromp_> because the 8 dominates the 7 1s 13:19 < andytoshi> yep 13:20 -!- EvilHero_ [~EvilHero@208.77.77.34] has quit [Ping timeout: 240 seconds] 13:20 -!- Guyver2 [~Guyver2@guyver2.xs4all.nl] has quit [Ping timeout: 260 seconds] 13:20 -!- Guyver2_ is now known as Guyver2 13:20 < tromp_> now the compact chain needs to distinguish between real chains 8 8 and 8 1 1 1 1 1 1 8 13:20 < tromp_> but both could claim to have compact chain 8 15 13:21 < tromp_> with the first unable to witness the dropping of 7 13:22 < tromp_> or maybe you no longer wish to distinguish these? 13:24 -!- Guyver2_ [~Guyver2@guyver2.xs4all.nl] has joined #bitcoin-wizards 13:25 < tromp_> i think they need to be distinguished or else a 7-deep reorg is too easy to pull off 13:25 < andytoshi> this is covered in section 3.3.2 13:25 -!- Guyver2 [~Guyver2@guyver2.xs4all.nl] has quit [Ping timeout: 260 seconds] 13:25 -!- Guyver2_ is now known as Guyver2 13:25 < tromp_> ok, lemme study that 13:26 < andytoshi> it's not too bad, it just says yes, you can pull off that reorg with nontrivial probability but the expectation is the same, so if you have a tail of explicit blocks you can tamp down the probability to negligible 13:26 < andytoshi> or rather, require luck followed by a ton of work 13:27 < tromp_> i guess this is why in the popow paper they also use the latest k blocks in addition to the compact chain 13:28 < andytoshi> yeah, it's sorta inherent, there is some theorem amiller pointed me to that pretty-much implies this is necessary 13:28 < andytoshi> https://en.wikipedia.org/wiki/Chernoff_bound 13:28 < tromp_> i agree that for k beyond a few dozen, that gives you pretty close to the full security 13:29 < andytoshi> :) 13:31 -!- pero [~pero@unaffiliated/pero] has joined #bitcoin-wizards 13:31 -!- pero [~pero@unaffiliated/pero] has left #bitcoin-wizards [] 13:31 < tromp_> but i'm still not sure whether your notion of effective difficulty can be made verifiable 13:33 < andytoshi> right 13:33 < tromp_> the popow paper just chains blocks of same luck-level 13:34 < tromp_> which obviously avoids the complication of effective diff 13:36 < tromp_> what if we siimply require decreasing luck? 13:36 < tromp_> in the compact chain 13:37 < tromp_> i guess that will make it too long 13:37 < tromp_> perhaps each next block on compact chain has to be 1-eps less lucky 13:37 < andytoshi> yes, everything i tried along these lines made the "compact chain" only linear 13:38 < andytoshi> or failed to accomplish whatever security improvement i wanted 13:40 < tromp_> so if eps = 0.1 then if you find a block with hash T/a, you then replace all blocks on compact chain with hash <= T/(a*0.9) 13:41 < tromp_> hmm, that's not gonna work:( 13:43 < tromp_> the thing is, you want bigger gaps near start of compact chain, but smaller gaps near end 13:44 < tromp_> in order to keep the length healthy 13:47 < tromp_> we want to find some auto-sizing single-chain version of KLS16+ that remains verifiable 13:51 -!- q4 [~q4@user-94-254-231-57.play-internet.pl] has quit [Ping timeout: 240 seconds] 13:52 < andytoshi> yup 13:52 < andytoshi> as i recall from when i was thinking about this, the auto-sizing property really broke the "only one compact chain" property 13:52 < andytoshi> but i don't recall the details of why this would happen, basically the idea was that adding blocks could sometimes make blocks return 14:04 -!- Giszmo [~leo@ip-228-233.219.201.nextelmovil.cl] has quit [Ping timeout: 260 seconds] 14:04 -!- buckowski [buckowski@gateway/shell/elitebnc/x-vfunavmeyjevehqd] has quit [Quit: ereet] 14:04 -!- Noldorin [~noldorin@unaffiliated/noldorin] has quit [Ping timeout: 255 seconds] 14:07 -!- buckowski [buckowski@gateway/shell/elitebnc/x-djjvrtuigxmwybqv] has joined #bitcoin-wizards 14:12 < tromp_> if you require increasing hashes on the compact chain, and pick them greedily, then the compact chain starts with the lowest hash ever, followed by the lowest hash in the later blocks, etc., but it's possible that a non-greedily picked chain has higher cumulative difficulty 14:14 -!- jannes [~jannes@095-097-246-234.static.chello.nl] has quit [Quit: Leaving] 14:18 -!- Giszmo [~leo@ip-233-233.219.201.nextelmovil.cl] has joined #bitcoin-wizards 14:22 -!- bsm117532 [~mcelrath@135.84.167.210] has quit [Remote host closed the connection] 14:28 -!- bsm117532 [~mcelrath@135.84.167.210] has joined #bitcoin-wizards 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[Ping timeout: 255 seconds] 19:01 < tromp> anfytoshi, in your MW atgomic swap proposal, how does igno obtain sconv = k - k' + ex - e'x' ? he only knows k, x, e, e', R' = k' G, and P' = x' G 19:01 < tromp> make that andytoshi :) 19:05 -!- cyphase [~cyphase@unaffiliated/cyphase] has joined #bitcoin-wizards 19:07 -!- uiuc-slack [~uiuc-slac@li175-104.members.linode.com] has joined #bitcoin-wizards 19:07 -!- meZee [SwedFTP@unaffiliated/swedftp] has joined #bitcoin-wizards 19:08 -!- Guest47306 [~socrates1@li175-104.members.linode.com] has joined #bitcoin-wizards 19:08 -!- Guest47306 [~socrates1@li175-104.members.linode.com] has quit [Changing host] 19:08 -!- Guest47306 [~socrates1@unaffiliated/socrates1024] has joined #bitcoin-wizards 19:08 -!- Guest47306 is now known as amiller 19:09 -!- lmacken [~lewk@fedora/lmacken] has joined #bitcoin-wizards 19:30 -!- cyphase [~cyphase@unaffiliated/cyphase] has quit [Ping timeout: 240 seconds] 19:35 -!- cyphase [~cyphase@unaffiliated/cyphase] has joined 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