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04:14 < wallet42> math question: How do I calculate the "80%" range of a repeated poisson process? E.g. if I have a block mean time of 600. There is a "80%" chance that I will find between 5-7 blocks in 10*mean seconds.
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04:16 < sipa> the CDF for a poisson distribution is f(x) = exp(-l) * sum(l^i / i!, i=0..x)
04:17 < sipa> so the chance that you have less than or equal to x blocks in 10*600 seconds is exp(-10) * sum(10^i / i!, i=0..x)
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04:22 < wallet42> http://www.wolframalpha.com/input/?i=exp(-10)*sum(10%5Ei+%2F+i!,+i%3D1..12). So .79 chance of finding between 1 and 12 blocks in an hour?
04:23 < wallet42> thank you sipa :-)
04:24 < sipa> http://www.wolframalpha.com/input/?i=P(1+%3C%3D+X+%3C%3D+12)+with+X+~+Poisson(lambda%3D10)
04:24 < sipa> easier ^
04:24 < wallet42> beautiful
04:25 < sipa> i'll admit that i'm surprised that wolfram understood my query on the first try
04:25 < wallet42> WA is awesome
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04:25 < wallet42> in python do I use random.expovariate(1)*600 to get a random blocktime?
04:27 < sipa> or random.expovariate(1/600.0)
04:28 < wallet42> (y)
04:35 < wallet42> correction: an hour is obviously 6*mean. the answer is thus there is a ~80% chance that there will be between 3-8 blocks in an hour.
04:36 < sipa> assuming the hashrate and difficulty are aligned
04:36 < sipa> which is almost never the case
04:36 < sipa> and worse, we don't know how misaligned it is :)
04:36 < wallet42> sure. it's theoretical
04:37 < wallet42> also block found != block height +1 because of orphans
04:37 < sipa> not relevant
04:37 < sipa> the difficulty adjust based on the number of blocks that make it into the chain
04:38 < sipa> so if your numbers are for how many blocks are added to the chain (rather than the number of blocks found overall), your formula is correct
04:38 < wallet42> you're right
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08:31 < tromp_> what percentage of bitcoin is in txo with fully known public key (ie. at risk of quantum breakthrough) ?
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08:50 < sipa> tromp_: i don't have numbers, but i exoect very little
08:50 < sipa> *expect
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08:54 < cjd> that's a neat question
08:59 < tromp_> i expect less than 10% but more than a few %
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09:13 < proslogion> all of them if we go full mimblewimble
09:14 < cjd> that's an annoying feature of MW
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09:30 < kanzure> nsh: https://web.stanford.edu/~montanar/RESEARCH/BOOK/book.html
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10:38 < bsm117532> A quick skim of this book, it seems these authors may be making a very common error by assuming entropy is extensive (scales linearly with the number of particles).  In Quantum Mechanics this is manifestly false, but virtually every textbook I know of makes this mistake.  I wonder if Quantum Information Theory as a field is making this mistake in general...
10:39 < bsm117532> The key phrase is "mixing entropy" -- it's an additional non-extensive entropy term that is ignored in classical statistical mechanics (even though virtually all statistical mechanics texts are talking about quantum particles).
10:40 < bsm117532> See also the Gibbs Paradox...
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11:01 < r0ach> bob:  kinda off-topic, but since you're already talking about physics, what's your take on global EROEI trends in relation to being able to do the upkeep on a world reserve currency crypto via PoW for like 100 years?  Is it a showstopper for PoW?
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11:02 < r0ach> I don't really see a cryptocurrency being able to beat a physical object in market cap.  I think that would be an irrational market, but the question remains...
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11:03 < r0ach> (i.e. gold or petro dollar or helium3 dollar or whatever)
11:03 < bsm117532> r0ach: PoW is a bearer bond.  It will be worth exactly as much as the PoW used to create it.  It's not a showstopper, unless hashrate starts decreasing, and more than half the "high-water mark" of hashrate disappears.  At that point, in order to continue, the consensus algorithm must be divorced from PoW.
11:04 < bsm117532> One thing I'd like to see in general is a PBFT or Honey Badger like network that accepts PoW hashes, divorcing consensus from PoW.
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11:06 < r0ach> well, not quite the answer I was looking for, and your answer seemed kinda sunk cost fallacy to me heh
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11:07 < bsm117532> Heh what do you mean?
11:07 < r0ach> as in, I'm more in the Gavin boat on that department, that Bitcoin doesn't have lots of value because we burned up a bunch of money mining it.
11:09 < waxwing> "It will be worth exactly as much as the PoW used to create it." <-- *maybe* exactly as much as the PoW that would be needed to create a new equal amount, but not that.
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11:21 < bsm117532> r0ach, waxwing PoW is a price floor.  Insert your own reason the price might be higher...
11:23 < waxwing> sure but that would be PoW today; not when it was created :) admittedly that's kind of a silly distinction assuming non-fungibility between old and new, so no matter.
11:24 < bsm117532> Yeah PoW hardware and electricity expenditure is a function of time, then it gets folded through the coin allocation schedule.  It's clear after both of those functions, coins created at different times involved different amounts of real-world expenditure.
11:28 < r0ach> or inefficient market participants get taken to the cleaners and all remaining contestants are below 0 price per coin, then they dump causing big miners to stop mining, giving you no price floor at all...
11:29 < bsm117532> That sounds like an "inefficient markets" assumption.
11:32 < sipa> bsm117532: by "PoW is a price floor", you mean "exchange_rate >= emergy_and_hardware_cost_expended_per_block / subsidy_and_fee_per_block" ?
11:32 < bsm117532> yes.
11:32 < sipa> if so, i agree, but there are many variables in that equation :)
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11:33 < bsm117532> Sure ;-)
11:33 < waxwing> yeah and can only be a long run equilibrium too. almost too feedback-y to be a useful concept.
11:34 < bsm117532> Well if you remove PoW, there is absolutely no tie to real-world assets.  The marginal cost of a database row is zero.  So all other inputs are wishes on unicorns dancing on rainbows.
11:37 <@gmaxwell> bsm117532: your promoting a discredited econmic theory. If I buy the hope diamond, smash it to pieces, and pay the pope to urinate on the result. ... is the resulting produce highly valuable, owing to its very expensive construction and rarity? No.
11:37 < brg444> yeah that all seems kind of backward to me too..
11:38 <@gmaxwell> bsm117532: POW has no fixed amount (beyond difficulty 1)-- the system difficulty will simply adapt to whatever the offered load is.
11:38 <@gmaxwell> So it _cannot_ prop up the price.
11:38 < waxwing> PoW doesn't give value *intrinsically*, but indirectly - by the effect it has on consensus.
11:39 < bsm117532> PoW has zero value, but it does have a cost.
11:39 < bsm117532> gmaxwell: your example also has zero value but nonzero cost.
11:40 < bsm117532> Sometimes I use the phrase "economic tie" rather than "price floor" for this concept -- the tie is to cost, not value.
11:40 <@gmaxwell> it also has effectively zero _fixed_ cost. Almost all the cost comes externally from competition to drive difficulty up.
11:41 < sipa> historically that effect eas very visible
11:41 < sipa> in GPU days there was a clear causal effect between exchange rate and hash rate
11:41 < sipa> in that direction; not the opposite one
11:42 < sipa> so i'd rather say that exchange rate is an upper bound on pow
11:42 < sipa> rather than pow an lower bound on exchange rate
11:43 < proslogion> remember lots of capitals flow into mining to acquire bitcoins at lower than market price
11:43 <@gmaxwell> what sipa said.
11:43 < proslogion> but perhaps even today
11:44 < proslogion> we know that some very big miners hodl the majority of the coins they mined
11:45 < bsm117532> I argue it's a floor, sipa argues it's a ceiling...we're both right from the perspective of different market participants.  The net result is a correlation, causality is hard to prove.
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11:46 <@gmaxwell> bsm117532: please, thats bullshit.
11:47 <@gmaxwell> the operation of the system is transparent, saying that pow costs hold up the price just makes no logical sense, because there is no real minimum to pow costs. effectively miners are bidding to make blocks (with randomization).
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11:48 <@gmaxwell> And historically the temporal direction of the relationship was very clear. With price rises leading to predictable hashrate increases after a delay.
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11:50 < bsm117532> gmaxwell you're claiming that miners would prefer to sell at a loss than hold in the hopes of a profit.  That's bullshit.  Most are holding. But let's be civil?
11:51 < bsm117532> Insert a latency function in both directions...miners aren't going to hold forever, and there's a time lag in bringing new hardware online.
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11:52 <@gmaxwell> bsm117532: No I am not claiming that. I am claiming that the less profitable miners turn off their hashpower, and the difficulty goes down.
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11:53 < bsm117532> at least until they find cheaper power and ship their mining rigs...
11:53 < bsm117532> This is probably not relevant right now, since die shrink & tweak has dominated hashrate increases in ASICs so far.
11:54 <@gmaxwell> (the supply of newly mined coins is also very small relative to the market volumes.)
11:55 < bsm117532> There is a lot of speculation, that's true.
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11:56 < bsm117532> All I'm really saying is that without PoW, it's 100% speculation.
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11:57 <@gmaxwell> ::sigh::
11:57 <@gmaxwell> Then you are saying that its 100% speculation then.
11:58 < bsm117532> Only if you're saying PoW has zero cost?
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11:59 <@gmaxwell> Effectively, it has a almost zero fixed cost.  All the price for POW comes out of miners bidding up the difficulty.
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12:01 < bsm117532> But if miners are a small fraction of the market volumes, they'd be unable to do that.  You contradict yourself.
12:02 <@gmaxwell> ...
12:03 < cjd> hey gmax, thanks for bringing to light the VitalikMiner project on reddit
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12:03 <@gmaxwell> cjd: I'd just assumed everyone knew about that, the same related to it was so obnoxious.
12:04 <@gmaxwell> s/same/spam/
12:04 <@gmaxwell> bsm117532: What the heck does bitcoin market volumes have anything to do with what I just said?
12:04 < cjd> I can tell you that people who I talked to didn't know until now :)
12:04 < cjd> I didn't follow any of this stuff since 2012ish
12:05 < proslogion> the most interesting thing is: I trust that V was well aware Quantum mining is BS
12:05 <@gmaxwell> proslogion: I don't.
12:06 < proslogion> you have to take several leaps of faith to start believing it...
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12:06 < proslogion> not just one
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12:07 < cjd> I'm going to give him the benefit of the doubt on that one but I think there are some "institutional investors" who are absolutely livid to find out that ETH is basically a very advanced version of the good ol' 2012 era altcoin
12:08 < bsm117532> gmaxwell: If miners "bid up" I take that to mean they're pushing prices up by selling bitcoin at ever-higher prices.  Did I misunderstand you?  They also push up the difficulty, but the increase in difficulty is directly proportional to their new capital expenditures.
12:08 <@gmaxwell> bsm117532: miners burn energy to try to get the 1800 btc produced per day, the more energy the put in, the more they get, and the more the difficulty goes up. If they desire the coins less, say because the price they can sell them for falls, less profitable miners find it no longer worth running, they turn off, and the difficulty falls.
12:08 <@gmaxwell> bsm117532: _no_
12:08 < proslogion> https://bitcointalk.org/index.php?topic=325800.0 this is the talk he gave at around the same time period
12:09 < cjd> yes, that has already been passed along
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12:10 < bsm117532> gmaxwell: I agree with you.
12:10 <@gmaxwell> proslogion: I think people believe he has a lot more background an expirence than he does because he was a journalist that wrote about other people's activities. I don't doubt that he thought it was ~possible~ that 'simulated quantum miner' would work.
12:11 < bsm117532> gmaxwell: It sounds like you're describing exactly the same thing as me.  I'm unsure why we're disagreeing.
12:11 <@gmaxwell> bsm117532: so this cannot constutute a floor. Say, due to market effects, traders bring prices down 5 fold, this would make many miners unprofitable. They're pause or discontinue operations (As it would be just cheaper to buy bitcoins on the open market than to mine), those miners do that, the difficulty falls, some turn back on, and a new equlibrium is reached.
12:11 < proslogion> gmaxwell: you could check out the slides of his another talk in Israel above
12:12 <@gmaxwell> And we've watched this process play out many times.
12:12 < proslogion> it begs my belief to think that he didn't grasp that the single thing making Grover's algorithm more efficient on a QC than classical computers is the entanglement
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12:12 < bsm117532> gmaxwell: agreed.  I usually say "floor" because so many people balk at the idea that the correlation is as strong as you describe.  But in fact I think it is.
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12:14 <@gmaxwell> bsm117532: the only reason it's not 1:1 coupled like that is because of the the initial investment in hardware is a 'constant' in that formula. You don't buy hardware unless you're going to be N fold profitable, in order to recoup that investment, and so once you have it, price would have to fall (/difficulty rise) quite a bit before you'll turn it off.
12:16 < bsm117532> gmaxwell: yes.  My only minor disagreement is that "less profitable" miners don't turn of their equipment, *un*profitable miners turn off their equipment.
12:16 <@gmaxwell> this is also why I was quite insistant that the huge hashrate loss at the halving psztorc was predicting in here wouldn't happen.
12:16 < bsm117532> It's already priced in...
12:16 <@gmaxwell> bsm117532: actually, we know that less profitable miners turn off.  I don't fully understand why.
12:17 < bsm117532> What's their definition of "less"?
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12:17 < bsm117532> I mean, maybe power is more expensive at certain times of the day in certain jurisdictions?
12:18 <@gmaxwell> bsm117532: if you mean the bitcoin price is elevated on account of it, no-- doesn't really follow, newly mined coins are small compared to market volume. If you mean that miners declined to build lower return facilities ('pricing it in on the hashrate side'), then yes.
12:18 < bsm117532> While the halving was priced in, I wouldn't design a new coin with that "feature".  Halving someone's revenue won't always go over well...
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12:19 < bsm117532> gmaxwell: yes, priced in on the hashrate side.
12:19 <@gmaxwell> There are benefits to the structure in bitcoin that most people do not understand.
12:20 <@gmaxwell> bsm117532: e.g. I know of many miners turning off when they're getting $2 out for every $1 in, part of this is related to risk preference. It's still a risky $2.  Part is related to fixed costs.
12:20 < bsm117532> I've been fooling with an alternative allocation schedule that is continuous.  There's a window of reward that could be accepted by the network rules.  This window is directly related to the network "size" in seconds, and the orphan rate.
12:21 < bsm117532> Fact of the matter is that the halving is a synchronous event, as are blocks.  So both have to be slow, because the network is actually asynchronous...
12:21 <@gmaxwell> I think also some of it is related to the kinds of people that end up mining, because of the high risk and other factors it attracts parties that are dreaming of outsized returns. Once it's merely profitable, it isn't an attractive business to many of the people who were attracted to gamble on it in the begging, but I'm getting further into speculation there.
12:22 < alfas> In oil, the large companies are willing to let their rigs mine at a loss, because the investment was so large. Its not economical to turn them of.
12:22 < alfas> At least thats what i gather.
12:22 < bsm117532> Certainly.  I wonder if that means a shift in mining participants, as the market becomes more efficient...
12:23 <@gmaxwell> the halving structure encourages forward investment in infrastructure, it's also simple to implement and avoids creating weird incentives where if you fail to mine _this_ block, you're stuck with the boobie prize of a less paying later block.
12:23 < bsm117532> alfas: I was kind of assuming that was happening in Bitcoin.  gmaxwell says otherwise.  Interesting.
12:23 < brg444> bsm117532: Sure, people were willing to gamble and order from butterfly lab back then, not so anymore :P
12:23 <@gmaxwell> bsm117532: we haven't seen that shift because of the continual introduction of new hardware.
12:24 <@gmaxwell> alfas: bitcoin mining can be turned on and off at an instant, and the income is highly predictable (and to the extent it changes, you can simply go quiet until it does).
12:25 <@gmaxwell> alfas: once hardware is in hand, you put power in, get bitcoins out.  If the same spent on power in will buy bitcoins at the market cheaper, you can do that (assuming you even want the bitcoins-- many miners sell immediately)
12:26 <@gmaxwell> an oil rig will keep operating because you _may_ hit more oil, because you have sold futures on that oil in any case, and because you cannot economically 'pause it' to wait for better conditions (you're still stuck paying tremendous personell costs)... nor will conditions improve just by waiting.
12:28 < brg444> gmaxwell: would you say that the idea some would be willing to mine at slight loss to acquire "fungible" coins is folklore?
12:28 <@gmaxwell> and because of hardware improvent lifecycles, no one has been deploying a large amount of hashpower without an plan for immediate cost recovery.
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12:29 <@gmaxwell> brg444: There is truth to it, but it is more limited than you think.  Pools destroy that fungibility. (in fact, some pools have been taking that benefit for themselves-- paying users with well circulated coins)
12:29 < bsm117532> gmaxwell: that's not really true.  An oil producer could buy oil on the open market if it's price was low enough.  This dynamic is independent of the commodity...
12:30 <@gmaxwell> The transactional costs for making those deals are rather high.
12:30 <@gmaxwell> bsm117532: oil is not perfectly fungible, however, due to delivery conditions.
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12:31 <@gmaxwell> And the point I made is that continued operation is required to have any hope of furture recouping.
12:32 <@gmaxwell> There is also a different meaning 'at a loss' being used there. "At a loss relative to some cost model which includes the price of money" vs "at a loss relative to marginal operating expenses"
12:32 <@gmaxwell> the only reason to keep operating in the latter case, is because continued operation may result in improved returns in the future. This doesn't apply to bitcoin mining. You don't have to keep mining in order to find out that mining returns have improved.
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15:30 < Brokenrecord> i'm getting a warning on bitcoin.org what's going on?
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15:38 <@gmaxwell> you mean this? https://bitcoin.org/en/alert/2016-08-17-binary-safety
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15:41 < Brokenrecord> yes...
15:42 < Brokenrecord> i already downloaded core wallet but i how do i check i haven't been hacked?
15:42 < bsm1175321> wut.  I'm seriously curious what information leads to that warning...
15:43 < sipa> Brokenrecord: the warning is about the upcoming 0.13 version, which is not released yet
15:43 < sipa> though being careful is always important of course
15:43 < sipa> like verifying the GPG signatures, as mentioned on that page
15:44 < midnightmagic> :-o
15:44 < Brokenrecord> i'm trying to figure out how to verify
15:45 < sipa> i have no information about information that lead to that warning, btw
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15:45 < sipa> it was added in this commit: https://github.com/bitcoin-dot-org/bitcoin.org/commit/5e0fd5292c936324660c680e4e99506da659c9fb
15:46 < kanzure> this does not seem to be from a pull request
15:46 < sipa> it is not
15:47 <@gmaxwell> We really should have a better update procedure.
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15:48 < kanzure> was this discussed on the security mailing list at all?
15:48 < sipa> 00:45:20 < sipa> i have no information about information that lead to that warning, btw
15:48 < kanzure> actually nevermind, that list is re: bitcoin core, not bitcoin.org, i think
15:49 < sipa> well bitcoin.org (according to its owner) is a private website
15:51 < kanzure> i suggest #bitcoin or something instead of this channel for this issue
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15:55 < FNinTak> gmaxwell: one factor that would keep hashrate inflated even as price drops is electricity contracts for large miners
15:56 < FNinTak> They buy electricity in chunks of ~6 months and so normally cannot turn hardware off in response to price movements
15:56 <@gmaxwell> yes, though there is a well eastablished history of mining operations just disappearing out from under their electrical contracts.
15:57 < ruby32> is there some overview of the features to be added in 0.13?
15:58 < FNinTak> Also, while I agree that halving provides certainty re: reward on investment, I don't know if that justifies such a long timespan between adjustments
15:58 < sipa> ruby32: https://github.com/bitcoin/bitcoin/blob/0.13/doc/release-notes.md
15:59 < FNinTak> i.e. would a half-year adjustment cycle be too short? Alternatively, what if the curve became smoother towards the tail?
15:59 < sipa> ruby32: also, #bitcoin
16:00 < ruby32> sipa: thank you, and i'm sorry :o
16:02 < FNinTak> On a similar thread, is there an incentive to have a (relatively) slow diff. adjustment algorithm to disincentivize forks?
16:03 < FNinTak> Re: Part of why ETC fork has survived is because of the ETH diff. adjustment algo. being very fast
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16:08 <@gmaxwell> FNinTak: thats not really true, because go-ethereum being broken they immediately had to make a consensus change to reject the headers of the longer chain. They could have just as easily reset the difficulty at the same time.
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16:12 < FNinTak> you mean etc resetting difficulty or eth?
16:14 < FNinTak> either way, resetting the difficulty could still cause problems if it's not known what hashrate to expect on the fork
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16:23 < Firescar96> >thats not really true, because go-ethereum being broken
16:23 < Firescar96> plz, tell me more
16:24 < kanzure> "Redactable blockchain or Rewriting history in bitcoin and friends" https://eprint.iacr.org/2016/757.pdf
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16:45 < nsh> what are they proposing to do with chameleon hashes sans the verbosity?
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16:45 < nsh> hem
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18:59 < andytoshi> nsh: appears they are suggesting doing PoW with a chameleon hash (a hash function with a backdoor) so that some trusted entity can rewrite blocks after the fact (and mine for free)
19:03 < andytoshi> the whole thing is a confused mess, chameleon hashes are not optimization-free, doing redaction this way makes it impossible to tell which is the "original" and which is the "replacement" block, this allows long-after-the-fact double spending
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20:54 < Taek> Seems like it'd be difficult to propagate the new block. How would you know if a chameleon block had been propagated, how would you handle the lightcone of transaction spending, what happens when the secret leaks, etc etc
20:54 < Taek> preaching to the choir I guess
20:56 < Taek> The paper seems to care more about redacting data than about reverting monetary transactions
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