--- Log opened Sat Mar 07 00:00:14 2015
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06:48 < bramc> Related to the discussion here from a day ago, the amount of mining which happens will inevitably be directly related to the mining rewards. If transaction fees become nontrivial they'll increase mining rewards and cause more electricity to be wasted^H^H^H^H^H^Hspent on mining
06:49 < sipa> You get what you pay for.
06:50 < sipa> The security of the system, in a purely rational setting, is exactly what the community pays for (in form of subsidy and fees).
06:50 < sipa> That is, assuming there is no means for getting consensus without burning a resource.
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06:51 < sipa> In a POW setting, assuming zero hardware costs, that amount will largely go to electricity, minus profitability margins for miners.
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07:51 < kanzure> http://blog.qartis.com/decoding-small-qr-codes-by-hand/
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09:59 < kanzure> weird how charlie lee thinks the block interval was chosen randomly?
10:00 < CoinMuncher> He has to... otherwise is scamcoin falls to pieces.
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10:03 < kanzure> also he thinks mining difficulty is based on the number of people mining. that was also a huge shock for me to hear.
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10:20 < dgenr8> the network is overbuilt for the amount of value it secures today. but that's why the value can scale up immediately.
10:21 < dgenr8> credit where due, AA made the point today. kanzure posted links to transcripts in #bitcoin
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10:22 < Apocalyptic> dgenr8, I was actually thinking that reading the transcript as well, I'm quite surprised
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10:24 < kanzure> i have a strong urge to modify transcripts in real-time to be more correct.. but then i worry about attributing things to people that are correct but not what the people said.
10:26 < adlai> kanzure: add the note in brackets/parentheses?
10:27 < kanzure> hehe perhaps :)
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11:30 < kanzure> http://diyhpl.us/wiki/transcripts/mit-bitcoin-expo-2015/some-questions-for-bitcoiners/
11:31 < brisque> dgenr8: overbuilt? I think not. bitcoin's network is extremely immature.
11:33 < brisque> stratum is a particular problem for example. what's the point of having 300 petahash of SHA256d if a large portion of it can just be silently pushed around by whoever controls a pipe or has access to a BGP routing interface.
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11:39 < kanzure> "Last week we did a gut biome discussion. Much of our personality is driven by the bacteria in our gut. In certain diseases, a fecal matter transplant (basically a poop transplant) fixes diseases but you also get the personality and the allergies that you get the FMT from. So if you could imagine stealth FMTs, and you wake up and suddenly you are a different person. So we are going ot need tamper-proof assholes. So we know ...
11:39 < kanzure> ... experimentally that you can copy personality from one person to another with a fecal matter transplant, but what's interesting is when the NSA begins to design bacteria to make you behave in different ways. Perhaps this can solve depression in a few ways; so that means it will be funded. You have to be aware of the different levels and layers where attacks can occur."
11:39 < kanzure> beautiful level of paranoia that i can totally appreciate
11:45 < brisque> kanzure: you don't have to be crazy to be involved in bitcoin, but you probably are.
11:45 < Luke-Jr> kanzure: wait, is that literally true, or someone's joke?
11:45 < brisque> Luke-Jr: it is a real medical procedure, and it does have effects on peoples mood and diet.
11:46 < Luke-Jr> O.o
11:46 < bramc> The major changes from intestinal flora transplants have happened, but they're the exception rather than the rule
11:47 < jcorgan> it can be used to cure an otherwise antibiotic-resistent intestinal infection.
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11:48 < bramc> They are, in fact, very reliable at curing a number of otherwise very hard to cure intestinal infections
11:48 < instagibbs> not to defend Litecoin by any means, but did Satoshi actually give a reason for 10min?
11:49 < brisque> I think 10 minutes was just an otherwise undefined magic number.
11:49 < Luke-Jr> it's not a bad choice
11:50 < Luke-Jr> could have been trial and error
11:50 < instagibbs> right, like many things they ended up being pretty good
11:50 < bramc> instagibbs, A number was necessary? The tradeoff is that shorter times result in shorter transaction clearing times but more orphaned blocks
11:50 < instagibbs> No I understand why we like 10 min vs 12 seconds, but I was speaking historically
11:51 < Luke-Jr> bramc: nah, shorter times just reduce variance, they don't really help security other than that
11:52 < instagibbs> Yeah I'm not going to start investing in fecal futures quite  yet
11:52 < brisque> bramc: "orphan" is the wrong term to use here
11:52 < bramc> If you make the assumption that it takes about 5 seconds for a message to make its way through the whole network, then the average clearing time is minimized when the cycle time is set to e*5, or about 14 seconds. It doesn't go up fast as you increase, and goes up sharply as you go down, so it turns out that about 30 seconds is about the minimum you should consider with a minute being somewhat reasonable.
11:53 < brisque> bramc: that must be why Ethereum chose 14 seconds.
11:53 < jcorgan> someone empirically measured p2p transit time once, no?
11:53 < bramc> Luke-Jr, I didn't say anything about security. It's a latency issue. If anything shorter times hurt security because there are more orphan blocks
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11:54 < bramc> brisque, Uh... unfortunately that's probably true. Maybe when I explained this to Vitalik I should have made really, really clear that actually going with 14 seconds isn't such a hot idea
11:54 < Luke-Jr> jcorgan: for blocks, IIRC it was something like 2 minutes or so to cross the network, a few years ago
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11:55 < Luke-Jr> (obv this has not huge relevance to the current state)
11:55 < jcorgan> ISTR something in the last year that actually came up with 50% and 90% distribution times for TX
11:55 < instagibbs> It also makes your consensus fragile with active afttackers, no?
11:55 < brisque> bramc: it should be amusing to watch.
11:55 < instagibbs> sybilers slowing down propagation
11:55 < brisque> jcorgan: http://bitcoinstats.com/network/propagation/
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11:55 < jcorgan> that was it, thanks.
11:56 < bramc> brisque, What's your objection to my use of 'orphan'?
11:56 < instagibbs> bramc: I think the term is "stale"
11:56 < instagibbs> orphan implies dead parent?
11:56 < Luke-Jr> bramc: orphan blocks are ones without (or with unknown) parent blocks. you're not talking about those
11:56 < bramc> Oh okay
11:56 < instagibbs> Luke-Jr: like data could be totaly lost?
11:56 < brisque> instagibbs: implies no parent
11:56 < instagibbs> or just ficticious
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11:56 < instagibbs> ah ok
11:57 < Luke-Jr> it's a commonly misused term since the generation of a stale block is orphaned
11:57 < Luke-Jr> (that is, the stale block contains an orphan transaction)
11:57 < instagibbs> *scratches head*
11:59 < instagibbs> sorry could you rephrase that one more time, for posterity
11:59 < instagibbs> nevermind im googling
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11:59 < Luke-Jr> instagibbs: block.vtx[0] is orphaned when its block is not in the main chain
12:00 < instagibbs> roger
12:00 < bramc> I wonder if Joi Ito telling everybody to come on this channel was a good or a bad thing.
12:00 < brisque> bramc: at any rate it will be interesting to see how their network copes with 14 seconds. once you're down to that level, inter-node latency becomes utterly critical. just getting from asia to US is often in the 350ms range. if you assume an inv > getdata system like Bitcoin has you could be looking at 5% of your block time taken up in just latency between two nodes.
12:01 < jcorgan> i'm sure they'll come up with six different ways to propagate data and implement them simultaneously
12:01 < bramc> brisque, Yes latency becomes critical at that point. Although hopefully the relatively small transactions sets will make that easier.
12:01 < instagibbs> Active attacks on propagation will probably be more profitable, no?
12:02 < brisque> if you can jam someone else's blocks, sure.
12:02 < bramc> If you assume a million peers in the network and 100ms for a peer to get data out to two peers, that's two seconds for new blocks to propagate over the whole network
12:02 < bramc> instagibbs, Yes having lots of stale blocks means that attacks centered on making blocks stale are more likely to work
12:03 < bramc> So someone can improve their mining rate by having connections open to every peer in the universe and sending directly to all of them
12:03 < bramc> Or a mining pool can do it
12:03 < bramc> At 14s this matters a lot.
12:04 < brisque> I think people would start doing what they do in bitcoin, forget sending an inv, just force push blocks
12:04 < instagibbs> So yeah you'll end up staking for a pool that's highly connected with other pools, much like bitcoin
12:04 < instagibbs> (assuming they're doing PoS)
12:05 < bramc> Is my guess about zerocash right, that the public signatures are a hash of a serial number and a secret, and that the proofs involve showing a path to the current merkle root of all coins?
12:05 < bramc> brisque, blocks should be force pushed
12:06 < brisque> my node is going to be cutting onions if you do that.
12:07 < bramc> cutting onions?
12:07 < brisque> crying.
12:07 < bramc> When a peer gets a block, it should immediately blast the whole block to 2 or three peers and send notifications that it has the block to all of its other peers
12:08 < bramc> then send the block to a new peer who hasn't announced that they have it yet every 30 ms or so
12:09 < bramc> That way you have basically 100% overhead on distributing blocks but extremely low latency
12:09 < brisque> I don't think I have a single peer that's 30ms away
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12:10 < bramc> The 30 ms is in case that peer got a copy of the block from some completely unrelated route
12:10 < instagibbs> This really only matters to miners, I think
12:11 < kanzure> what's really weird is that joi ito is actually on irc
12:11 < kanzure> i just forget which channel he's hanging out in
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12:11 < kanzure> amiller: do you remember where joi hangs out on irc? :(
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12:12 < brisque> bramc: I meant that an announce every 30ms would have 10 in flight before I even get a reply to the first
12:12 < bramc> brisque, Oh it isn't an announce, it's just sending the block
12:13 < brisque> bramc: we would probably end up sending the binary to each other simultaneously then, which is a huge waste of time
12:13 < bramc> That whole I have X/send X/here is X automatically triples how long it takes for things to get across the network
12:13 < bramc> brisque, not if everybody only sends to two peers immediately
12:15 < bramc> Depending on assumptions, you can also do things like use ECC on the block and request extra bits from the peers who have started sending already
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12:15 < kanzure> ah, #joiito
12:15 < instagibbs> thanks for the writeup kanzure
12:15 < bramc> When you have megabyte size blocks that one is actually a good idea
12:16 < kanzure> instagibbs: yep.. videos are just rude. :)
12:16 < bramc> Maybe this makes me a jerk, but I find the vast bulk of what goes on in the bitcoin space to be irrelevant blathering
12:17 < kanzure> brisque: well, he's not wrong
12:17 < kanzure> Luke-Jr: yeah, joi ito said those things (see the transcript)
12:17 < instagibbs> is this not true in any "space" unless properly scoped? ;)
12:17 < brisque> kanzure: who isn't?
12:18 < kanzure> instagibbs: i'm not sure if fecal matter futures are the right asset for that. but if you have ideas about selling custom bacteria let me know. biology is sort of a hobby, you could say.
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12:18 < kanzure> brisque: sorry, i was responding to scrollback
12:19 < instagibbs> why do I feel like I'll be getting a visit by the CDC now
12:20 < bramc> instagibbs, Probably, I've often felt the same way about bittorrent and have probably come off like a jerk when someone claimed they were going to make a new protocol and I said something to the effect of 'those idiots will never get anywhere'
12:20 < lechuga_> bramc: why ecc?
12:20 < bramc> lechuga_, less chance of bandwidth wastage from two peers sending the same data
12:21 < instagibbs> bitcoin-land also suffers from being a many-pronged beast. Anyone with a degree in anything is an 'expert' in something about it
12:21 < bramc> That can also be minimized by having peers request specific pieces, but we're trying to eliminate the announce/request/send cycle
12:21 < lechuga_> seems like a heavy way of dealing with that, couldnt they just send from random offsets
12:21 < lechuga_> ah ic
12:21 < lechuga_> true
12:21 < kanzure> instagibbs: nah, the fbi has taken up the "regulation" of diybio
12:22 < kanzure> instagibbs: http://diyhpl.us/wiki/transcripts/fbi-diybio-2012/
12:22 < brisque> bramc: much nicer just to use pushes from the high speed block relay and ignore it completely
12:22 < bramc> brisque, I'd rather there not be a high speed block relay. That probably means there's a mining pool
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12:23 < brisque> bramc: hm? not really. I don't think the block relay is pool related
12:23 < brisque> it's for pools but not necessary to be one to make good use of it
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12:23 < instagibbs> bramc: wishes, horses, yada
12:24 < bramc> brisque, Don't all peers do block relaying? How is a 'high speed' relay any different?
12:24 < lechuga_> hmm i wonder who qualcomm or whomever sues if bitcoin decided to use raptor codes
12:24 < bramc> lechuga_, Probably everybody running a peer
12:24 < lechuga_> ouch
12:25 < brisque> bramc: high speed relay is centralised, and builds blocks with a transaction cache. rather than getting a full 1MB block, you get the diff of what the relay already knows it has sent to you. you can usually get blocks in a couple of hundred bytes rather than 1MB.
12:25 < bramc> brisque, Why don't regular peers do that protocol between each other?
12:26 < bramc> That diff thing is a good idea, the main problem being that the transactions in a block don't have to be sorted :-P
12:26 < bramc> And, uh, is there a reference for that protocol somewhere?
12:27 < brisque> http://sourceforge.net/p/bitcoin/mailman/message/31604935/
12:27 < lechuga_> itd be a fun experiment to make block downloads swarm based with something like utp imo
12:27 < instagibbs> bramc: I think the answer is: messing with p2p code for such little gains for non-miners is probably not worth it
12:27 < kanzure> .title
12:27 < yoleaux> Bitcoin / Mailing Lists
12:27 < kanzure> blah
12:27 < lechuga_> but not using ledbat
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12:28 < brisque> there's nothing stopping anyone from making alternate bitcoin network transports. it's actually preferable that they do.
12:28 < jcorgan> whatever happened to the bitcoin over DVBT project in Finland?  I think they were planning to use fountain codes.
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12:29 < bramc> Is this relay node thing actually deployed? Is it a specific set of blessed peers which work this way?
12:29 < instagibbs> To my mind separating p2p network of full nodes and what miners use is a useful separation of concerns. They have different goals; why conflate designs
12:29 < bramc> Supporting utp should be trivial. It's a drop-in replacement for TCP.
12:30 < bramc> instagibbs, I'm not sure what you just said
12:30 < lechuga_> does utp support drop-in cc or just ledbat
12:30 < bramc> miners should be running full nodes, or at least ones which know about all current utxos.
12:30 < bramc> just ledbat, but not sure what you mean by cc
12:31 < lechuga_> congestion control
12:31 < bramc> It backs off on both higher latency and packet loss
12:31 < instagibbs> I, as a fuill node runner, don't really carea bout a few seconds either way in getting a new block
12:31 < instagibbs> miners do
12:31 < instagibbs> (perhaps? probably? it's plausible!)
12:31 < bramc> instagibbs, fair enough, but if the protocol were properly designed the diff thing wouldn't come at any additional cost
12:32 < lechuga_> it plays to lose as i understand which wouldnt be a desireable property in this case
12:32 < maaku> bramc: read the email, there's deployment information at the bottom
12:32 < adlai> bramc: https://github.com/TheBlueMatt/RelayNode
12:33 < bramc> lechuga_, that's a bit of a mix. It keeps latencies low
12:33 < instagibbs> bramc: it's the unforunate centralization of mining that makes this a concern at all. Just for now, it really makes sense to separate. And new transport layers are A-ok regardless
12:34 < bramc> instagibbs, high latencies encourage centralization in mining
12:35 < bramc> maaku, My question was, 'did this actually happen?'
12:35 < instagibbs> I'm not arguing that. (sorry I'm not clear)
12:35 < maaku> yes it did
12:36 < bramc> Okay, one more thing for me to read through
12:36 < lechuga_> with utp nat nodes could become more useful
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12:41 < bramc> Yes utp makes hole punching easier
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12:49 < kanzure> JoiIto: howdy
12:49 < kanzure> amiller: ping
12:50 < JoiIto> hey... thanks for the email and the transcript.
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12:50 < kanzure> sure, i figure nobody has time for video :)
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12:52 < instagibbs> speaking of the SoK paper would it be a good idea to link a draft on bitcoin.ninja? The github repo link is um dated
12:54 < skittylx> kanzure: I love your anotations <3
12:54 < kanzure> my goal is real-time correctness proofs
12:54 < kanzure> inject coq proofs maybe
12:56 < CoinMuncher> Am I missing why you are talking about ecc and diffs and stuff, while the invertible bloom filters already solve sending blocks as "constant" (small) size? https://gist.github.com/gavinandresen/e20c3b5a1d4b97f79ac2  Sorry if I'm missing anything.
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12:58 < sipa> CoinMuncher: they require much higher cpu time on sender and receiver side per transaction
12:58 < sipa> constant size transmission size doesn't gain you much if everything else becomes slower
12:58 < bramc> also add more to latency because of the extra round trip
12:59 < CoinMuncher> sipa: ok, didn't know it was significantly slower.
13:00 < sipa> i think constant time propagation is a dream
13:00 < CoinMuncher> bramc: I was under the impression it actually did everything in 1 round trip. (maybe I should shut up, among experts)
13:01 < bramc> CoinMuncher, Yeah that means that for me to send to you we need to do announce/request/response instead of me just sending
13:03 < CoinMuncher> bramc: I guess I meant half round trip actually... the sender can build the whole invertible-bloomfiltered block and just start sending it to everyone. It's only to prevent flooding the P2P network that it waits for an inv/request, isn't it.   Or were you talking about another way to get around that?
13:05 < bramc> CoinMuncher, For peers to validate the block they need the whole thing, unless you're talking about using a bloom filter to specify which already distributed things are in the block, which does in fact work for compression but isn't the most elegant way of doing that.
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13:07 < CoinMuncher> The point with this proposal is that the peers already have 95% of the transactions, even before the block itself exists/has been found/has been mined. So this is a little like ECC in that the sender creates a blob of data that receivers can extract an entire block from IF they have at least 95% of the transactions already. (Any 95%)
13:08 < bramc> It hits funny edge cases when there's false positives in the bloom filter which you have to hunt down
13:08 < CoinMuncher> But I'm really not the right person to explain it, so if you haven't read it, please do read it yourself.
13:08 < bramc> Oh i just saw you posted a link. Will read.
13:08 < kanzure> JoiIto: you may find this helpful http://diyhpl.us/~bryan/papers2/bitcoin/
13:09 < CoinMuncher> Sure. But as long as 90% of the peers get the blocks in 1 round trip, and a few edge cases are just unlucky once in a while. Does it really matter?
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13:10 < brisque> CoinMuncher: higher CPU usage is probably a concern
13:11 < CoinMuncher> Gavin was attended to research around the topic and within a few months built it into a proof of concept. I'm sure there's still issues with it (CPU as sipa mentioned). So I have no idea whether it will ever be usable. But I hope so, cause it's so cool :)
13:12 < CoinMuncher> brisque: yeah sipa just mentioned that. I wasn't aware of that. I'll try to read up on that some more.
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13:12 < bramc> CoinMuncher, I'll need to read through this in more detail later but my instinct is that it's better for peers to have more stateful connections which remember exactly what their peer has and send a diff directly off of that
13:13 < bramc> There are some subtleties to that, in that if you're sending me stuff and I want to send you a set based off of what you already have I need to specify what the last message number I received from you was. That's all doable though.
13:13 < bramc> The canonical block ordering is critical
13:14 < CoinMuncher> yeah I think that's what the relay thing does. And http://kryptoradio.koodilehto.fi/ too if I'm not mistaken.
13:16 < bramc> I'm not sure what benefit the invertible bloom lookup tables are supposed to bring
13:16 < bramc> In some sense they make it simpler because you can rebroadcast the bloom filter you already got but the amount of complexity in parsing and handling them more than destroys that efficiency
13:17 < CoinMuncher> That you don't need to know what the other peer knows. You just assume they already have x% and give them something that will guarantee they can reconstruct a the 100%.
13:17 < CoinMuncher> No matter what 100-x% they are missing.
13:17 < CoinMuncher> apparently yeah.
13:17 < bramc> But you should already know what your peer has already
13:18 < CoinMuncher> No, that's the cool trick about it. You don't.
13:18 < kanzure> wow i can't believe they said that-- "Zero of those companies should be downloading bitcoind."
13:18 < kanzure> that's a ridiculous position
13:18 < lechuga_> ?
13:18 < kanzure> a third party blockchain data service provider telling you to not use bitcoin
13:18 < kanzure> yeah that's secure -_-
13:18 < CoinMuncher> bramc: unless I'm totally mistaken.. you're making me feel insecure now :)
13:18 < bramc> When you have an open direction to a peer you should be actively sending all transactions bidirectionally
13:19 < gmaxwell> kanzure: who said that?
13:19 < kanzure> bitgo
13:19 < kanzure> on the livestream
13:19 < instagibbs> kanzure: yikes
13:19 < gmaxwell> bleh
13:19 < bramc> kanzure, What, if anything, is their justification?
13:19 < instagibbs> zooko is there right, can he pester on qa
13:19 < brisque> CoinMuncher: you're not, reed solomon ECC will let you do that, but with significant CPU cost.
13:20 < gmaxwell> damnit. time to get away from the computer and find something to distract me from wanting to never see bitcoin again.
13:20 < kanzure> their justification is "use our api"
13:20 < lechuga_> lol
13:20 < lechuga_> :(
13:20 < kanzure> i have nothing against these people, i have something against bad ideas
13:20 < kanzure> and not using bitcoind is a bad idea
13:21 < CoinMuncher> brisque: Do you have any chance a link of a discussion about the CPU usage of the invertible-bloomfilter stuff? Or is that common knowledge for any ECC-thing related?
13:21 < kanzure> gmaxwell: i've been trying to formulate a short, succint and good argument against these third-party api providers. but so far i don't think i have anything strong enough.
13:21 < brisque> bitgo already has the nonsense with bitstamp where somehow it's claimed having bitgo co-signing their transactions will be of benefit and provide ultimate security. to make it easier for people to use, they have a proxy shim for their API so it looks like you're talking to bitcoind. there's something horrible implied there, that people working with other people's money can't even be bothered writing a new interface.
13:22 < kanzure> brisque: they weren't even verifying the change addresses
13:22 < kanzure> so the change addresses were just returned from the api
13:22 < instagibbs> brisque: ive been meaning to ask: does Bitstamp literally not run a bitcoind instance anymore?
13:22 < instagibbs> I read their blog post about the switch and became very confused
13:22 < instagibbs> I thought bitgo was supposed to be a signing oracle or something
13:22 < brisque> CoinMuncher: that's just from observations about using reed solomon ECC stuff before. I use parchive to add error correction to my binary backups, and it's fairly intensive to create.
13:22 < gmaxwell> kanzure: that defeat the whole point of bitcoin? if you were willing to trust a third party you could simply hand your funds over to them (a bank), and in doing so make things much more efficient? ... there is very little use of access to the network which does not create a theft risk for you. People think too myopically that control of private keys is sufficient; it's not.
13:23 < lechuga_> instagibbs: good question
13:23 < kanzure> gmaxwell: "but the real world involves trust" was one argument in response i've heard to that argument
13:23 < instagibbs> lechuga_: I was going to interview with them so I was reading their stuff...  got concerned let's say
13:23 < kanzure> gmaxwell: their argument is also something about using them for blockchain data
13:24 < brisque> instagibbs: I don't know their internals. it was implied that bitstamp was using the bitcoind shim and that's why they could move to using bitgo for their transactions so quickly, but I don't know if that's what really happened. if nothing else, bitgo can't do anything by being a cosigner except doing some rate limiting. without other signals about the state of bitstamps database there's no use to having a second party at all.
13:24 < kanzure> brisque: i think they are using both bitgod and bitcoind at the moment
13:24 < instagibbs> there is *no* reason to not use bitcoind, signing oracles shouldn't be crippling you
13:24 < bramc> CoinMuncher, ECC and bloom filters are different things. The ECC stuff is for trying to optimize having to send blocks as one big glob, which is totally irrelevant if the transactions went into the block in canonical order so you can send diffs reasonably
13:24 < kanzure> i think they are still using bitgo as a hot wallet though
13:24 < kanzure> where withdrawal requests cause transactions to get signed immediately
13:24 < kanzure> so it's just pass-through to the remote api
13:25 < brisque> which is, for all intents, worthless.
13:25 < gmaxwell> kanzure: sure it does. As does paypal. The purpose of bitcoin is to produce an alternative with less dependence on it (from the horses mouth! http://p2pfoundation.ning.com/forum/topics/bitcoin-open-source ); and thats pretty much the _only_ thing it does fundimentally better than the classical alternatives.  This isn't to say that there can't be trust in bitcoin, filling in where the tech goes; b
13:25 < gmaxwell> ut to add a ton of trust right at the base for the specific purpose the software was built to serve? thats insane.
13:25 < lechuga_> brisque: it makes an offline attack more difficult no?
13:25 < kanzure> "we have upwards of 30 exchanges building on us" -_____-
13:25 < brisque> lechuga_: offline attack?
13:25 < kanzure> "just helping them get out of the security business" hahahaha
13:25 < kanzure> holy crap
13:25 < lechuga_> someone grabs the keys and does whatever with no auditability
13:25 < brisque> kanzure: "we are a very high profile security target"
13:26 < instagibbs> brisque: there are tons of use cases for signing oracles. Just not to replace a person's view of the ledger!
13:26 < brisque> lechuga_: does that even matter? someone malicious at their control panel can just slowly make 100BTC transactions and bitgo will just keep blindly signing them.
13:26 < bramc> gmaxwell, I came up with a super lightweight and scalable cryptocurrency. Everybody keeps track of their own balance, and stops spending when they hit zero. Efficiency!
13:26 < lechuga_> u can at least see it happening and have an opportunity to stop it
13:27 < gmaxwell> bramc: no software required too. :)
13:27 < brisque> instagibbs: yes, I understand that, but the "bitgod" shim just implements a blind signing oracle. the only thing bitgo can do is rate limit based on the size of transactions, and knowing that limit will probably be in place you can do some analysis to figure out what it is and avoid it.
13:27 < bramc> gmaxwell, I'm sure trusted computing will be able to make it work properly
13:28 < kanzure> nobody is going to be around to call these people out
13:28 < instagibbs> brisque: understood. Hence my confusion
13:28 < kanzure> i mean maybe blockstream, but that's blood in the water
13:28 < brisque> instagibbs: oh you were agreeing with me, sorry I mis-parsed your response
13:28 < bramc> blood in the water?
13:29 < kanzure> bramc: blockstream calling this stuff out is politically inconvenient for them :(
13:29 < lechuga_> unfortunate
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13:29 < instagibbs> you need someone with cred, but no money on line. Which is like... academics i guess
13:30 < bramc> To a first approximation, all the major vendors in bitcoin space are incompetents, cranks, and charlatans, the only part which is well engineered and up front about what it can and can't do is core
13:30 < bramc> There are a few small exceptions of course, but mostly when looking at a major vendor the question you should be asking is whether they're an incompetent, crank, or charlatan
13:31 < kanzure> other developers wont find this obvious though
13:32 < bramc> CoinMuncher, in answer to your question, the relative CPU usage of doing bloom filter stuff vs. transaction state stuff is 'obvious'
13:34 < brisque> instagibbs: suffering a lot there from the simple fact that bitcoin knowledge is fairly limited to a small group of people. the ones you might hire based on popularity are fools like andreas antonopoulos, who have absolutely no applicable experience in advising these sorts of things.
13:34 < bramc> kanzure, The thing about how you can't be sure what's going on in bitcoin unless you're running your own peer is kind of fundamental
13:35 < kanzure> bramc: sure but then how is it possible for companies to take themselves seriously like this
13:35 < brisque> bramc: not in the least because these API services have got things horribly wrong in the past.
13:35 < kanzure> brisque: oh?
13:36 < kanzure> gmaxwell: perhaps if people absolutely insist on providing third party blockchain api services, then they should perhaps only be implementing things like simplified payment verification instead... or some other restricted set of features that might possibly be secure. and then anything else should be considered broken.
13:36 < brisque> kanzure: https://i.imgur.com/JNhoV1R.png
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13:37 < kanzure> brisque: i prefer a more canonical url https://people.xiph.org/~greg/21mbtc.png
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13:37 < brisque> kanzure: I don't.
13:37 < kanzure> heh
13:38 < CoinMuncher> bramc: I think the link I sent you might not be best one to explain the trick here. It's not like ECC in that ECC makes the data larger. This trick actually makes it substantially smaller.  Maybe you prefer to hear it from Rusty Russel: http://rustyrussell.github.io/pettycoin/2014/11/05/Playing-with-invertible-bloom-lookup-tables-and-bitcoin-transactions.html   or the actual paper:  http://conferences.sigcomm.org/sigcomm/2011/papers/sigcomm/p21
13:38 < brisque> kanzure: point was that it's not even a matter of trusting these third parties to be malicious, it's also trusting them not to be incompetent.
13:38 < bramc> CoinMuncher, thanks for the links, although I do understand the concept
13:39 < bramc> CoinMuncher, your link to the 'actual paper' is broken
13:40 < kanzure> "all transactions are independently verifiable from other sources" -_-
13:41 < CoinMuncher> bramc: I agree that if you have knowledge about what the other party already has, then it's obviously more efficient and simpler (both bandwidth and CPU wise) to figure out what to send them.
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13:42 < bramc> CoinMuncher, Yeah that's the breakdown: I don't see why you'd want to avoid that
13:42 < CoinMuncher> bramc: Also: I forgot that nodes can actually have a pretty good idea of which transactions each of their peers already knows (and already do).
13:43 < CoinMuncher> bramc: sorry about broken link, not sure why. But rusty links to it early in his blogpost.
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13:46 < bramc> CoinMuncher, I'm not wondering about your thought process so much and Gavin's
13:48 < CoinMuncher> bramc: Now that you made it clear to me, I do too :)
13:51 < gmaxwell> kanzure: that was the argument I made to electrum ever so long ago, and they agreed, and did.  Dunno why people are so quick to trust totally unauthenticated blockchain views. Control of a targets view of transactions is somewhat equivilent to stealing everyone _elses_ private keys.
13:51 < bramc> Its not like running bitcoind locally is some huge drain on resources
13:52 < kanzure> gmaxwell: ah i wasn't aware that electrum listened to advice and took action on that. that's great.
13:52 < gmaxwell> bramc: To hear people talk it is. To be fair there are a lot of aspects of the expirence which are needlessly bad.
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13:54 < bramc> Starting countdown to when bitcoin info services start doing DDOS to anyone running a bitcoind as part of their FUD campaign
13:54 < brisque> bramc: well, blockchain.info already do denial of service attack the network
13:54 < gmaxwell> e.g. bitcoin core could do more to give a better 'hot start' expirence.
13:55 < gmaxwell> brisque: I don't think intentionally; though piuk was pretty overly talking about some agressive deanon attacks intentionally on bct a long while ago (and then backed off when I WTFed him)
13:55 < skyraider> gmaxwell: what would constitute an authenticated blockchain view?
13:56 < brisque> gmaxwell: hah, did you see their original "transaction message" system?
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13:57 < brisque> one of those UTXO exploding things where it just encodes "messages" as pubkey hashes and sends dust to them.
13:57 < instagibbs> bramc: re:resources for bitcoind, indeed. Makes me really hesitatant to talk of "scaling up" if even businesses can't be bothered to run full node.
14:01 < brisque> bramc: seriously though, I don't think people will actually denial of service attack full nodes at this stage, but they will design systems which are infeasible to run on your own.
14:02 < brisque> ie, if I make a transaction system that needs a 1TB index to run, or you can connect to my centralised API, you can guess which people will choose.
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14:02 < skittylx> Divert % of fees to a monthly lottery. Client has to be connected for a certian % of time to be eligible.
14:03 < brisque> skittylx: we can't pay listening nodes, that's completely out of the question due to the sybil problem. you stand to make the network significantly worse by doing that.
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14:05 < skittylx> right, thats the whole point of pow. Dunno why I didn't think of that.
14:06 < brisque> there's one sybil node at the moment broadcasting on 2**8 addresses. alone that's literally 5% of the network's listening capacity. if you incentivise that, well.
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14:14 < kanzure> gmaxwell: perhaps the solution is to just repeat everything enough times until everyone forgets that they knew a worse idea
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14:19 < bramc> Given that even heirarchical wallets aren't standard...
14:20 < kanzure> bip32?
14:21 < jcorgan> kanzure: that only describes key derivation, it doesn't standardize wallet hierarchy layout
14:22 < bramc> kanzure, I meant aren't standardly used by actual wallets. Obviously there's a completely reasonable standard for doing them.
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14:24 < bramc> Per the in person conversation from the other day, apparently Vitalik is living full time in Canada, but often in the bay area - http://fusion.net/story/47172/the-young-stars-of-bitcoin/
14:30 < kanzure> "If anyone is interested in using a bip44 Wallet to generate deterministic GPG identities, I have implemented a demonstration in javascript" http://memwallet.info/bip44ext/test.html https://github.com/taelfrinn/bip44extention/blob/master/README.md
14:32 < phantomcircuit> kanzure, wat
14:32 < bramc> I really wish people would give up on pgp already
14:32 < kanzure> bramc: what's your preference?
14:33 < phantomcircuit> bramc, but then what am i going to use this spiffy OpenPGP dongle for??
14:33 < leakypat> kanzure: that looks very interesting
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14:33 < bramc> kanzure, There really isn't a decent standard for encrypted asynchronous communication at this point unfortunately, particularly email
14:34 < leakypat> Does it mean I can recover my RSA key pair from the same seed as the EC keys?
14:34 < kanzure> is this a usability complaint?
14:34 < bramc> kanzure, <BEGIN PGP SIGNED MESSAGE>yes<END PGP SIGNED MESSAGE>
14:34 < kanzure> you forgot your signature?
14:35 < kanzure> (i wouldn't recommend signing extra short messages though)
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14:55 < gmaxwell> skyraider: the blockchain itself an authenticated datastructure which supports efficient access without breaking the authentication (SPV).
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17:14 < kanzure> "Program synthesis in reverse engineering" http://www.nosuchcon.org/talks/2014/D1_01_Rolf_Rolles_Program_Synthesis_in_reverse_Engineering.pdf
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22:07 < kanzure> "Synthesis of masking countermeasures against side channel attacks" http://www.ece.vt.edu/chaowang/pubDOC/EldibW14CAV.pdf
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23:58 < Taek> If you use schnorr signatures, could you spend multiple outputs with a single signature?
23:58 < Taek> you'd take the pubkeys of each output and add them up, and then take each of the signatures and add those up
23:58 < sipa> no
23:59 < Taek> where's my misunderstanding?
23:59 < sipa> the receiver could choose a pubkey that is the inverse of the sum of some other destinations
23:59 < sipa> cancelling their key out
--- Log closed Sun Mar 08 00:00:15 2015