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| brisque | OT, but I thought I'd have a look into how various pinning systems are using OP_RETURN code messages to pin data into the Bitcoin blockchain (as it seems to be all the rage). there's some some reasonably compact encodings, some sort of weird things (did you really need an 21 byte magic number?), and then there's someone who had to multipart their data over three transactions because their encoding didn't fit in the 40 byte limit. | 00:41 |
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| brisque | 6a257b2264657363223a2022416e67656c2048656c70696e672048616e64204d696e7574657322 + 6a252c20226e616d65223a202248484d696e75746573222c2022746f74616c223a203231383430 + 6a0a2031303030303030307d | 00:42 |
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| adam3us | andytoshi: you might be able to make a threshold ringsig by committing to two c_i, c_j values with a degree two directed cycle. seems like in the obvious construction you would reveal the distance between the two known keys. | 02:07 |
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| fenn | zooko: any thoughts on this? http://archiveteam.org/index.php?title=INTERNETARCHIVE.BAK http://archiveteam.org/index.php?title=Talk:INTERNETARCHIVE.BAK | 02:23 |
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| fluffypony | fenn: given a super-user-friendly wrapper to Tahoe-LAFS you could have something distributable quite easily | 02:31 |
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| andytoshi | adam3us: interesting. i think this works (as does committing to the sum say by H(g^{s_1}g^{s_2}y_1^{c_1}y_2^{c_2}) ) but in both cases each vertex corresponds to a pair of keys, so to really make it 2-of-n you'd need n^2 vertices; if you have only n vertices it's "any of these n pairs" | 05:47 |
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| zooko | fenn, fluffypony: interesting! Thanks for the link. | 06:17 |
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| zooko | Do you know if there is a mailing list or otherwise how I should contact those folks? | 06:25 |
| adam3us | andytoshi: curiously i seem to have a size 2 ringsig. baffled. (assuming you know product of all public keys, and can query for random public keys from the utxo set) | 06:27 |
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| adam3us | andytoshi: you need to look at 4.2 scheme in https://eprint.iacr.org/2003/067.pdf | 06:28 |
| adam3us | andytoshi: s is the index of the signer, pick a random j and compute all a_i values (for i!=j) as eg a_i=H^k(a_0) and R_i = g^a_i (forall i!=j again). finally observe you can compute R_j in the method they use to compute R_s, even the j != s. and so you get a size 3 ringsig (sig = R_j, a_0, s) | 06:31 |
| adam3us | andytoshi: however looking at that for a while you realise you only need one R value. (in the above all a_i other than a_j are disclosed, you need to keep a_j private for security otherwise you leak your private key). | 06:31 |
| andytoshi | adam3us: o.O incredible, you must be wrong ;) i'll check it out | 06:33 |
| adam3us | andytoshi: the resulting signature for l=3 (3 public keys y_1=g^x_1 etc) is (R,s) signing for signer i=2, where R=g^a/(y_1*y_3)^H(m,R), s=a+x_2*H(m,R) | 06:34 |
| adam3us | andytoshi: well i think i convinced myself the only way I am is if 4.2 signature in that paper is broken. | 06:34 |
| adam3us | andytoshi: verification is to check g^s=?R*(y1*y2*y3)^H(m,R) | 06:35 |
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| andytoshi | adam3us: wow! | 06:40 |
| adam3us | andytoshi: yeah | 06:41 |
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| andytoshi | their proof looks very simple to adapt, i will do that as a first step to see if anything breaks, then fill in the "can be shown ... in the extended paper" etc parts | 06:44 |
| andytoshi | but just looking at your scheme, you can sorta see that it's just as secure as a schnorr sig | 06:44 |
| adam3us | andytoshi: if this holds water it constitutes a trapdoor free discrete log accumulator with a fixed size standard schnorr signature sized set membership proof | 06:45 |
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| andytoshi | adam3us: yes, so, this does still seem too good to be true, so i will not let my heart race ... plus "why has nobody else thought of this, it's just multiplication?" ... but it seems to hold up | 06:46 |
| adam3us | andytoshi: (spent the entire weekend trying to get variants to work:) | 06:46 |
| andytoshi | oh, ok, if it's only obvious in retrospect i'm more confident :) | 06:47 |
| adam3us | andytoshi: another way to look at it is well that signature form is a lot more amenable (4.2) its also size 2+n, but there are limited restrictions on a_i values. so then the problem is to choose random a_i values such that l-1 of them are from a CPRNG and the last is chosen at random, in such a way that you cant tell which is the random one | 06:48 |
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| andytoshi | i spent a long time thinking about "l-1 are CPRNG and you can't tell which is the lth" and couldn't get sublinearity | 06:49 |
| andytoshi | ohh, i see, a is the sum, so that gives it to you ... and in this case you actually only need the sum | 06:49 |
| adam3us | andytoshi: which is a double headache when you use that hash-ring ringsig. but here its much simpler construction, and that observation that you can sign using a R_i value where you are signing as j such that j!=i does the trick. the rest is an observation that wait what do we even need the l R_i values for. | 06:49 |
| andytoshi | for verification | 06:50 |
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| adam3us | andytoshi: right. verifying a sum is clearly useless for convincing the verifier of anything. | 06:51 |
| adam3us | andytoshi: also if l=1 this thing is a schnorr signature | 06:53 |
| andytoshi | do you have a rigorous argument for why this doesn't reveal the signer's index? i think it is not statistically indistinguishable bc a appears in both cases, but maybe distinguishing reduces to DL or DDH or something? | 06:53 |
| adam3us | andytoshi: i think any of the signers could generate the same signature equally likely at random. | 06:54 |
| andytoshi | ah, yeah, that's correct in the RO model (i think: a and H both give results in {0,1}^n, together they span all {0,1}^{2n} sigs) | 06:56 |
| andytoshi | oh, no, even for a fixed hash fn i think you are right | 06:57 |
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| andytoshi | s can be chosen uniformly at random, then this implies the same R for every signer (tho a will be different) | 06:58 |
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| adam3us | andytoshi: right. i believe that means it retains the unconditional privacy claimed in the paper. | 06:59 |
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| andytoshi | i think you still need an RO to argue it (because you want H(m,R) to be stat independent of R) but yes, i believe that's correct | 07:00 |
| adam3us | andytoshi: yes there could be a little bias from the non-uniformity of the hash function. | 07:01 |
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| andytoshi | i have to sit through a 90-minute undergrad crypto lecture today, i will try to reduce schnorr to breaking this (because i'm not comfortable enough with forking lemma stuff to believe my own proof of such a consequential result, tho im ok with blindly believing schnorr is secure) | 07:03 |
| adam3us | ok | 07:03 |
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| kanzure | funny to see the european central bank talking about proof-of-stake http://www.ecb.europa.eu/pub/pdf/other/virtualcurrencyschemesen.pdf | 08:22 |
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| tromp | and further displaying their ignorance in " | 08:30 |
| tromp | Currently, efforts are put | 08:30 |
| kanzure | "... the Bitcoin protocol does not require or provide any identification or verification of the users, nor does it generate historical records of transactions" | 08:30 |
| tromp | into using the X11 algorithm for reasons of higher cryptographic security and lower processing | 08:30 |
| tromp | costs, so it is quite possible that the algorithms mentioned above will be replaced shortly. | 08:30 |
| tromp | " | 08:30 |
| kanzure | this is an impressive level of ignorance | 08:30 |
| * fluffypony shudders | 08:31 | |
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| brisque | this is exactly why you should hire competent consultants. | 08:31 |
| tromp | they also claim that no custom hardware is developed for scrypt:( | 08:31 |
| fluffypony | "lower processing costs" is literally the stupidest thing I've ever heard | 08:31 |
| fluffypony | "it doesn't use 100% of the CPU/GPU when mining, it must be because it's efficient!" | 08:32 |
| brisque | fluffypony: it stems from the fact that X11 GPU miners have very low power draw due to poor optimisation. | 08:32 |
| fluffypony | brisque: yes | 08:32 |
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| fluffypony | I mentioned that in an interview last week, that the "power savings" of X11 are fictitious, and as a result of bad optimisation | 08:33 |
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| kanzure | now here's what you should really be worried about: what if this is their default level of investigation into any topic, not just bitcoin? | 08:35 |
| brisque | bitcoin in general is a pretty difficult concept to gather information about. there's very few authoritative sources of good information, few people who understand the concepts well enough to separate the signal from the noise. lots of the common knowledge about bitcoin is completely untrue as a result. | 08:38 |
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| fluffypony | so then why not approach the developers? | 08:43 |
| andytoshi | fluffypony: the devs are very busy and it's not obvious a priori that they are the experts | 08:44 |
| andytoshi | fluffypony: there is a problem in this space that if you don't understand the tech really well then it's basically "our word against andreas/drk/whoever" and those guys are paid more than us | 08:44 |
| fluffypony | true on both counts, what I meant to wonder is if they even try | 08:44 |
| brisque | fluffypony: it's difficult to tell a hack from a developer if you're not in this world. | 08:45 |
| kanzure | brisque: the first step is to ask them if they are a developer | 08:45 |
| fluffypony | yeah | 08:45 |
| tromp | for all we know they contacted the X11 devs believing they are experts | 08:45 |
| fluffypony | I suppose Linus gets approached by fewer businesses than Canonical do | 08:45 |
| fluffypony | tromp: I really hope not, but it's entirely possible | 08:46 |
| fluffypony | in other news, how's Cuckoo Cycle going? | 08:48 |
| tromp | some ppl told me they're planning a new coin using it | 08:48 |
| zooko | I'm very interested in Cuckoo PoW. | 08:49 |
| fluffypony | seconded | 08:49 |
| brisque | kanzure: maybe not. see while I might dismiss a crackpot blog that's ranting for pages on end about how secp256k was generated using the hash of hell and will cause us to burn as a result, it's hard for other people to make the distinction between that being nonsense and having a basis in reality. without the background knowledge that's a lot better than sipa almost single handedly writing headers first, isn't it? | 08:49 |
| tromp | hi Zooko! any feedback from the scientists? | 08:49 |
| zooko | Hi tromp! No, I haven't brought it up to them yet. | 08:50 |
| * zooko makes a note to self to do that. | 08:50 | |
| tromp | you made that note before:) | 08:50 |
| kanzure | brisque: this is all just extremely basic knowledge acquisition stuff though. if anything i would expect them to know how to do knowledge acquisition well. | 08:51 |
| zooko | Well, not in these notes here I didn't. :-) | 08:51 |
| kanzure | "first step to not breaking everything: be aware of prinicpal agent problems and epistemology, or sources of knowledge and why people claim to have certain knowledge" | 08:51 |
| kanzure | *principal agent | 08:51 |
| brisque | kanzure: knowledge acquisition will tell you the UTXO is stored in memory. there's published books on the matter, lots of reddit posts and people talking about it on bitcointalk. surely that's correct then? | 08:52 |
| fluffypony | "PoS systems rarely have a SHA-256 algorithm" | 08:52 |
| andytoshi | without reading this, it sounds like it's actually logically impossible to extract an implementation from it, so i suspect this is not something we need to worry about | 08:53 |
| kanzure | brisque: no, that's not knowledge acquisition -___- | 08:54 |
| kanzure | brisque: that's just reading reddit.. that's not how you know things. | 08:54 |
| fluffypony | kanzure: but you may stumble on to Reddit comments / threads when Googling for stuff | 08:54 |
| kanzure | googling for stuff is also not often how you know things.. that might tell you about the existence of certain ideas, concepts, or perspectives. but again that' not how you know something. | 08:55 |
| brisque | kanzure: I read it in a published book, googled around and there's lots of people talking about it as fact. is that not due diligence? | 08:55 |
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| kanzure | no | 08:55 |
| kanzure | that is definitely not due diligence | 08:56 |
| kanzure | have you guys never verified anything ever? | 08:56 |
| fluffypony | I read it on the interwebz | 08:56 |
| kanzure | http://en.wikipedia.org/wiki/Epistemology | 08:57 |
| sipa | i just trust what #bitcoin-wizards conclides | 08:57 |
| brisque | given the relative importance of the "fact", I think it would be going overboard to research it further if you were trying to understand bitcoin. | 08:57 |
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| fluffypony | sipa: conclides...? | 08:57 |
| andytoshi | kanzure: "not due diligence" sure but surely you can see expecting that to work, i mean, it can't be that 99% of everything published about bitcoin is lies, right? how would that even happen? | 08:57 |
| andytoshi | (btw i am curious about the answer to "how did this even happen?") | 08:58 |
| zooko | Perhaps you folks should apply these techniques of discerning principle/agent problems | 08:58 |
| fluffypony | andytoshi: they used a "top tier consulting firm" | 08:58 |
| fluffypony | (I guess) | 08:58 |
| zooko | and why folks claim to know things, and all that | 08:58 |
| sipa | fluffypony: concludes | 08:58 |
| zooko | to the question of what purposes are served by that bank publishing that document. | 08:58 |
| kanzure | andytoshi: no, i can't really believe that a central bank would have such a poor understanding of how knowledge works | 08:58 |
| zooko | Maybe technical accuracy is useless or even an impediment to their goals. | 08:58 |
| zooko | I don't know. I haven't done that exercise of trying to discern that stuff. | 08:58 |
| fluffypony | sipa: ah, so follow-the-herd then, it just happens to be a particularly gifted herd :-P | 08:59 |
| sipa | fluffypony: a herd that rarely actually comes to a consensus :) | 08:59 |
| fluffypony | hah hah | 08:59 |
| brisque | kanzure: look, neither can I, but that wasn't the point I was making, just that it's hard to work out right from wrong with this particular subject due to the tight clustering of knowledge. | 08:59 |
| kanzure | brisque: yes but then the correct thing to do would be to *increase* carefulness, not *decrease* it | 09:00 |
| Luke-Jr | andytoshi: it's actually not that surprising IMO | 09:02 |
| brisque | andytoshi: I can't go into the details, but I did consult for a company who had an absolutely insane idea of what to do with bitcoin. unworkable expectations of fairy dust, the takeaway I got from them was that the problem was me, they'd find someone else to consult with who would tell them it's possible. it's always possible something like that happened. | 09:04 |
| brisque | you say our idea is insane? we'll find someone who we can pay to say it isn't. | 09:05 |
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| kanzure | "Research perspectives and challenges for Bitcoin and cryptocurrencies" http://www.jbonneau.com/doc/BMCNKF15-IEEESP-bitcoin.pdf | 09:08 |
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| kanzure | oh wait, i didn't recognize this paper because it wasn't posted by amiller | 09:09 |
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| amiller | yes it was | 09:10 |
| amiller | wat | 09:10 |
| kanzure | oh. | 09:10 |
| kanzure | well i'm out of ideas. i just didn't see you. | 09:10 |
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| brisque | I don't understand "turing complete scripting" being presented as a simply positive thing, with little regard to what it actually gives you and what it takes away. as far as I'm aware there's never been a case where someone has been obstructed by the lack of loops. | 09:15 |
| brisque | (that's RE that paper) | 09:15 |
| runeks | So, what do people think about the proposed "Lightning Network"? http://lightning.network/lightning-network-paper-DRAFT-0.5.pdf | 09:16 |
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| maaku | brisque: what does it take away? | 09:28 |
| brisque | maaku: static analysis, or ease of it anyway. | 09:29 |
| maaku | brisque: that's pretty orthogonal, unless there's a specific analysis you are talking about (e.g. runtime) | 09:29 |
| maaku | but runtime analysis isn't a concern for bitcoin scripting -- the signer has that information | 09:30 |
| brisque | halting problem means you end up with awkward solutions like Ethereum uses, where they burn fees rather than using them as a mining incentive. | 09:31 |
| amiller | brisque, i dont think your criticism makes any sense yet | 09:31 |
| brisque | amiller: I'll put them on the backburner for the moment then. | 09:32 |
| maaku | brisque: I disagree. Ethereum's approach is awful, but that's their fault. Include execution statistics (e.g. opcode count) in the signature. If it doesn't match, invalidate the transaction | 09:32 |
| amiller | first of all, in ethereum the fees aren't burned, they're given to miners | 09:32 |
| maaku | brisque: please don't. i'm interested to hear what your critiques are | 09:33 |
| sipa | the full node network ought to set the limits of what execution cost is acceptable | 09:33 |
| sipa | not miners | 09:33 |
| maaku | sipa: but that's an ideal we don't have now | 09:34 |
| amiller | there's an auto adjusting of the gas limit per block, that's a different issue though | 09:34 |
| brisque | amiller: are you sure about that? I would have sworn they burn them, reason being that otherwise they aren't really a denial of service limiter if you're a miner. | 09:34 |
| sipa | maaku: we do; checksig limit per block and blocksize limit in bytes | 09:34 |
| sipa | the limits may not be well-chosen, but they exist | 09:34 |
| amiller | brisque, for now they're given to miners, there's been some talk about burning a portion of it to avoid some incentive misalignemnt, but that's really unrelated to turing completness | 09:35 |
| sipa | i think turing completeness is mostly irrelevant | 09:35 |
| sipa | harmless, and useless | 09:35 |
| amiller | i think so too, it's a red herring of a phrase, really the point is just 'more expressive' | 09:35 |
| sipa | my only real problem with is that it adds unnecessary complexity | 09:36 |
| amiller | that seems subjective, its arguably not that complex | 09:36 |
| sipa | maybe | 09:36 |
| sipa | i'll need to see a use case for it before i'm convinced :) | 09:36 |
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| maaku | sipa: I'm not sure how that is different? you could have hard limits no matter what scripting system is used | 09:37 |
| sipa | maaku: yes | 09:37 |
| amiller | the last thing i want to argue about with brisque is that static analysis isn't actually the issue | 09:37 |
| sipa | which is why i say it's orthogonal | 09:37 |
| amiller | "static analysis" is often about like denovo analysis of exisitng legacy code | 09:37 |
| amiller | like i'm going to apply some static analysis to the big bucket o' openssl code | 09:37 |
| brisque | amiller: wonder where I got that idea from, I thought that was mentioned authoritatively somewhere but seems not, sorry about that. | 09:37 |
| amiller | but if you want to assert things about ethereum contracts, you can provides hints to the static analysis or a proof about whatever constraint holds | 09:37 |
| amiller | (that's all theoretical i don't think anyone proposed concretely how to do that yet, but it's obvious from a pl persepctive) | 09:38 |
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| sipa | in general, i think the bitcoin scripting system ought to be something that allows signers to prove a particular pre-committed condition was fullfilled | 09:38 |
| maaku | amiller brisque: it's a fair complaint that certain systems are not as amenable to static analysis as they could be. but imho it's a mostly orthogonal issue to turing completeness | 09:39 |
| sipa | which doesn't need generalized execution | 09:39 |
| sipa | and can be made significantly more efficient without | 09:39 |
| sipa | (batch validation e.g.) | 09:39 |
| maaku | sipa: the qustion is whether their exist constraints that are too difficult to represent without generalized computation | 09:39 |
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| sipa | yup | 09:40 |
| sipa | of course those exist | 09:40 |
| sipa | the question is whether they are useful :) | 09:40 |
| sipa | (and i have no answer to that question) | 09:40 |
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| andytoshi | adam3us: i cant compute R in your scheme, it depends on H(m,R) | 10:05 |
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| andytoshi | (and i cant figure a way around this) | 10:05 |
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| adam3us | andytoshi: so I think the intermediate version works where R_k is computed as in the paper and R_i=g^a_i for all i!=k j is signer, k is random from 1..l. i think maybe i simplified one too many times, and it needs two R values. (with all l R values it is a size 3 sig vs a size 2; reducing number of R values is a computational not size saving) | 10:15 |
| adam3us | andytoshi: but you are right about the size 2 version.. appears broken. | 10:15 |
| adam3us | andytoshi: well non-functional! | 10:15 |
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| bramc | I'm utterly unconvinced that bitcoin's scripting language gains anything whatsoever from its expressivity. Having a list of things which can help unlock a utxo and an enumerated list of subsets which can do it successfully can accomplish everything I've seen seriously claimed the script has ever been used for. | 10:26 |
| bramc | Does anybody have an opinion on my suggestion that a 'better' way of doing ANYONECANPAY is to make it so that in transactions with multiple inputs the individual signatures from the inputs can be either for the whole transaction or just for their specific input and the output? | 10:27 |
| tromp | the other novelty Ethereum brings is having smart stateful contracts | 10:28 |
| sipa | tromp: that's imho the only interesting thing about it | 10:28 |
| tromp | which would be rather handicapped without an expressive script language | 10:28 |
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| dgenr8 | sipa: why again, do miners need the full-node network? | 10:32 |
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| brisque | I might be thinking particularly narrowly here, but the use of stateful contracts seems limited, you're still stuck in the same position where you have no external inputs. | 10:33 |
| sipa | dgenr8: ? | 10:33 |
| sipa | dgenr8: miners are clients to the full node network | 10:33 |
| sipa | they produce blocks that follow the rules mandated by the network | 10:33 |
| sipa | and are paid by subsidy and fees in return | 10:34 |
| dgenr8 | sipa: why do they need non-miners? because they don't know the difference? | 10:34 |
| sipa | dgenr8: because they are the ones that give the currency value | 10:35 |
| dgenr8 | sipa: how? | 10:35 |
| sipa | withoit users of the system, there is no reason to produce blocks for it | 10:35 |
| dgenr8 | sipa: define user | 10:35 |
| sipa | anyone | 10:36 |
| sipa | you me | 10:36 |
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| sipa | payment processors | 10:36 |
| sipa | and miners themselvds | 10:36 |
| sipa | i'm not saying that miners are not also users | 10:36 |
| sipa | but they are not the only ones | 10:37 |
| sipa | and they are not privileged | 10:37 |
| sipa | they just provide a service the system needs | 10:37 |
| dgenr8 | sipa: would it be a problem if miners proved hashpower to each other, connected to themselves, and only looked to that network for transactions? | 10:37 |
| sipa | yes | 10:37 |
| dgenr8 | ok that's what I was looking for | 10:37 |
| sipa | it would mean they could give themselves as much money as they wanted | 10:38 |
| sipa | if nobody could verify their correct operation | 10:38 |
| dgenr8 | so preserving the state where the network contains non-mining full nodes is critical | 10:38 |
| sipa | no | 10:39 |
| dgenr8 | do explain ;) | 10:39 |
| sipa | it is critical that anyone who _wants_ is able to validate the system's correctness | 10:39 |
| sipa | whether they actually do, or how many people do, or whether they are non-miners is not relevant | 10:39 |
| dgenr8 | who cares whether some random person thinks the all-miner network that receives all transactions is correct or not | 10:40 |
| sipa | it's the only interesting thing in bitcoin imho | 10:40 |
| sipa | a monetary system that works without needing to trust anyone, for almost all of its operation | 10:41 |
| sipa | if i lose that abiloty, i'll gladly ise paypal instead | 10:41 |
| sipa | *ability, use | 10:41 |
| dgenr8 | what good is having that ability unless miners need you for something? | 10:41 |
| sipa | it's other way around | 10:42 |
| sipa | me, and every other user of the currency, needs miners | 10:42 |
| sipa | they need us for the btc they receive to have valie | 10:42 |
| sipa | a currency that isn't used has no value | 10:42 |
| dgenr8 | today they need us | 10:43 |
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| dgenr8 | because the transactions are submitted to the p2p network | 10:43 |
| sipa | heh | 10:44 |
| sipa | transactions are irrelevant | 10:44 |
| sipa | they can be broadcast in any way | 10:44 |
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| sipa | they're not part of bitcoin's consensus model | 10:44 |
| sipa | only blocks are | 10:44 |
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| sipa | and full nodes set the rules on what blocks are valid | 10:44 |
| sipa | and miners create blocks obeying those rules | 10:45 |
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| dgenr8 | they why would it be a problem if miners proved hashpower to each other, connected to themselves, and only looked to that network for transactions? | 10:45 |
| dgenr8 | s/they/then | 10:46 |
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| sipa | i may misunderstand the question | 10:46 |
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| sipa | where they look for transactions is totally irrelevant | 10:46 |
| sipa | the question is whether people accept the blocks they produce | 10:46 |
| dgenr8 | in this reality, people = other miners | 10:47 |
| sipa | no | 10:48 |
| sipa | assume miners decide among themselves that a 100 BTC reward is totally acceptable | 10:48 |
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| sipa | 100% of miners agree about this | 10:48 |
| sipa | what would happen? | 10:48 |
| sipa | the rest of the network ignores their blocks, a new miners will pop up that produce blocks that the network accepts | 10:49 |
| belcher | the 100btc would be valueless because no investor would want it, miners wouldnt make any money | 10:49 |
| sipa | *and new | 10:49 |
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| maaku | bramc: there are use cases for which an expressive script is required. in particular conditions of spend which are forced-inhereted by child transactions | 10:52 |
| bramc | maaku, What do you mean? Can you give an example? | 10:53 |
| maaku | indeed that is the only category of conditions that i've so far discovered which absolutely benefits from expanded script | 10:53 |
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| maaku | bramc: e.g. redemption of IOUs -- a condition attached to an issued IOU which allows the issuer to replace it by its face value at any time, no matter its current ownership status | 10:54 |
| maaku | i have so far found no other way of implementing that except by inhereted constraints (aka covenants), and no way of doing that neatly except by generalized execution | 10:55 |
| bramc | dgenr8, Without mining you can verify transactions but you can't verify that a particular coin wasn't spent already. The entirety of bitcoin's mining and consensus model is a glorified distributed database whose only guarantee is that double spends don't happen. Or at least, double spends would require more than a certain amount of resources to be able to pull off. | 10:55 |
| bramc | maaku, Do you have a link for that? I honestly don't know what you're talking about, and would like to read up on it. | 10:56 |
| maaku | bramc: it is not written up anywhere, to my knowledge. i'd be happy to answer questions about it though | 10:57 |
| bramc | Well for starters, what is an IOU? | 10:57 |
| sipa | i owe you | 10:57 |
| bramc | sipa, I know that, I meant more specifically and technically | 10:58 |
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| sipa | bramc: oh, sorry, no idea then | 10:59 |
| maaku | bramc: asset issuance could be implemented any number of ways -- colored coins, natively validated assets with a fork, committed transactions, etc. | 10:59 |
| maaku | but an IOU is just some issued asset that I, the issuer, promise to someday redeem for face value plus interest | 10:59 |
| maaku | the trouble is that if there is interest, I can be held hostage by the owner so long as the interest I originally agreed to is above market rate | 11:00 |
| maaku | the owner will just hold on collecting interest and refusing to let me take it back, at least until he fears I might default | 11:01 |
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| bramc | Not sure what you're saying. It's possible to have interest-bearing things in bitcoin, but they're unspendable until due, which isn't very useful. | 11:02 |
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| maaku | so you put a condition on it -- the IOU can be transferred to someone else by its owner, in which case the condition follows, OR anyone can replace it with its face value and accumulated interest, and the condition is dropped | 11:03 |
| bramc | What is an IOU in bitcoin land? All there are are utxos. | 11:03 |
| maaku | bramc: i'm not sure what you're saying either. it's prefectly possible to have interest-bearing things that continue to accumulate interest while being used | 11:03 |
| bramc | Can you give an example of a utxo script to support this stuff? | 11:04 |
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| maaku | bramc: no, because bitcoin scripting language is not expressive enough to do this, which is rather the point | 11:04 |
| bramc | Can you give an example of a script which could be made in an extended scripting language? | 11:05 |
| maaku | bramc: are you familiar with the concept of a quine? | 11:06 |
| bramc | I think i remember reading a hofstadter essay about them when I was in high school. Something about self-referencing sentences | 11:07 |
| maaku | http://en.wikipedia.org/wiki/Quine_%28computing%29 | 11:07 |
| maaku | a computer program which takes no input and prints its own source code | 11:07 |
| maaku | so the simplest version is - push my own code on the stack, push the output on the stack, check that the output script starts with my own code, yield | 11:08 |
| maaku | it's known as a 'covenant' around here because it allows you to attach a condition to a coin which is carried over to whoever later owns it, and can only be removed (if it can be removed) under explicit conditions | 11:09 |
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| brisque | https://bitcointalk.org/index.php?topic=278122.0 | 11:10 |
| brisque | .t | 11:10 |
| yoleaux | Mon, 02 Mar 2015 19:10:32 UTC | 11:10 |
| brisque | .title | 11:10 |
| yoleaux | CoinCovenants using SCIP signatures, an amusingly bad idea. | 11:10 |
| maaku | an amusingly awesome idea. i wish gmaxwell didn't title it that way | 11:12 |
| tromp | sounds like an amusingly controversial idea:) | 11:13 |
| bramc | maaku, Isn't bitcoin script incapable of evaluating the output which a utxo is going to? | 11:13 |
| brisque | yes. | 11:13 |
| maaku | bramc: in principle? no, that information is available in the transaction | 11:13 |
| maaku | bitcoin script can't do that now because there is no opcode to access that information | 11:13 |
| sipa | maaku: that we know of | 11:14 |
| bramc | That's what I thought | 11:14 |
| maaku | (and the other opcodes you'd need -- substr, etc., are disabled) | 11:14 |
| sipa | i wouldn't claim it is provably impossible | 11:14 |
| maaku | bramc: hence, the argument for more expressive script | 11:14 |
| bramc | This covenants post is reminding me of how back in 2002 acadamics thought it was awesome to spend time studying XML for all the awesome things it would enable | 11:16 |
| bramc | I made bencode and that was that. | 11:16 |
| maaku | bramc: if checksig wasn't a monolithic opcode but rather implemented as push-tx-data, hash, ecdsaverify as separate opcodes, this would have been doable with bitcoin 0.1 | 11:16 |
| bramc | I'm with gmaxwell on this: "Any attempt to think of why someone might want to do this leaves me screaming in horror" | 11:18 |
| bramc | It seems like an explicit violation of the doctrine of first sale | 11:18 |
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| sipa | it breaks fungibility of coins for starters | 11:18 |
| maaku | bramc: I just gave you above a very valid reason for doing this -- IOU redemption at issuers request is otherwise impossible | 11:18 |
| sipa | but the argument in favor is that there are very interesting applications, which, if supported in a generic way, almost certainly enable covenants as well | 11:19 |
| maaku | not to mention that there are plenty of other constructs you can come up with -- e.g. spending limits | 11:19 |
| bramc | Or transaction fees :-P | 11:20 |
| bramc | With this, an exchange could start tacking covenants onto transactions which (a) block further covenants and (b) require a fee be paid to the original exchange every time the coin changes hands | 11:20 |
| maaku | bramc: who would accept such a coin? | 11:21 |
| bramc | maaku, Anyone whose wallet supported it | 11:22 |
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| tromp | such coins would be deemed practically worthless | 11:23 |
| gwillen | bramc: wallet software right now will only recognize specific script templates as coins "paid to it" | 11:24 |
| gwillen | so it would have to be specifically changed in order to recognize a convenanted coin as an inbound coin being paid to it | 11:24 |
| gwillen | (which means that even if an exchange wrote in its ToS that it could send you convenanted coins, users would rebel if it did, since they would just see that they received no coins) | 11:26 |
| maaku | covenants break fungibility when they are used. thankfully it's not something that can just be transparently added to someone's pubkey | 11:26 |
| maaku | every wallet would have to be upgraded to specifically understand these new covenants | 11:26 |
| bramc | I think the only reasonable policy is to automatically reject any covenanted transaction | 11:27 |
| brisque | reject? | 11:27 |
| maaku | bramc: correct. accept only whitelisted covenants | 11:27 |
| brisque | you can ignore but not reject | 11:27 |
| maaku | attach anything not understood by the user base and you've effectively burnt the coins | 11:27 |
| maaku | bramc: i assume that's what he meant.. | 11:28 |
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| bramc | You can also, of course, encourage reasonable policies about covenants by not adding support for them to the scripting language to begin with | 11:31 |
| bramc | Because, you know, doctrine of first sale. | 11:31 |
| sipa | the problem, we have discovered, is that it is incredibly hard to make covenants impossible | 11:32 |
| sipa | bitcoin itself barely avoided it | 11:32 |
| sipa | very barely | 11:32 |
| sipa | you don't need explicit support for them | 11:32 |
| bramc | If you make it so that the output isn't available for the script to evaluate then there's no problem. | 11:33 |
| maaku | that plus: they actually solve real problems that otherwise have no acceptable solution | 11:33 |
| sipa | bramc: but you want outouts covered by the signatures | 11:34 |
| sipa | which brings them implicitly into scope | 11:34 |
| bramc | maaku, I still don't understand what you want your IOU covenant to do. Trying to parse what you wrote it sounds like an output which can be reclaimed at any time | 11:34 |
| sipa | just the ability to request "what is the hash i would have to sign for this transaction" is enough to have a covenant | 11:35 |
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| bramc | oh right, you can make it so that the output has to be provided so you can verify it. | 11:35 |
| maaku | bramc: you give me an IOU with 10% interest. I then decide to sit on it, because 10% annual interest is awesome. you want it back. how do you get it back? | 11:35 |
| bramc | maaku, Do you mean how can I pay it off? | 11:36 |
| maaku | yes | 11:36 |
| maaku | the covenant lets you pay it off at any time | 11:36 |
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| bramc | Not sure what point there is to doing IOUs in bitcoin, because there's no enforcement mechanism. I can just, you know, not pay it. | 11:36 |
| bramc | sipa, If you have a completely lobotomized signature system which doesn't allow anything even vaguely resembling scripts then avoiding covenants is straightforward. | 11:38 |
| sipa | sure | 11:38 |
| sipa | also not very interesting | 11:38 |
| bramc | http://en.wikipedia.org/wiki/First-sale_doctrine | 11:38 |
| sipa | i agree, it is easy to avoid | 11:38 |
| sipa | but not in any interesting system | 11:39 |
| bramc | sipa, totally interesting, you can still have hash preimage reveals, hence simultaneous transfer | 11:39 |
| sipa | sorry, too tired now :) | 11:39 |
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| bramc | http://en.wikipedia.org/wiki/First-sale_doctrine | 11:39 |
| bramc | You can even have preimage length checking (you'd have to work extra hard to avoid it) which allows for gambling | 11:40 |
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| maaku | bramc: first-sale doctrine doesn't apply here | 11:44 |
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| bramc | the theory behind it does. First sale doctrine was created to stop a lot of predatory practices which vendors had | 11:45 |
| gmaxwell | lol | 11:46 |
| maaku | *sigh*. the covenant solution *provides* first-sale doctrine rights | 11:46 |
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| maaku | otherwise if I wanted right to pay off at any time I'd have to have multisig control over the coins or something, and that's too granular a permission | 11:46 |
| maaku | the covenant solution is saying "I give up any control over who gets this IOU. You can resell it to anyone at any time for any price. I reserve the right to pay it off at a time of my chosing, but claim no other rights beyond that." | 11:48 |
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| dgenr8 | bramc: that's why miners are needed, but that wasn't my question | 11:50 |
| dgenr8 | sipa: if I may summarize you, miners need the validating p2p network because that's where users look. The fact that the transactions come from there is irrelevant. | 11:51 |
| bramc | dgenr8, I have no idea what point you're trying to make | 11:52 |
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| dgenr8 | just seeking to understand sipa's comment that the p2p network sets rules for miners | 11:55 |
| brisque | the p2p network is sort of unrelated, it would work (though probably not quite as well) via smoke signals. | 11:55 |
| dgenr8 | i didn't say "the IP network" | 11:56 |
| brisque | neither did I. | 11:57 |
| skittylx | non-mining nodes would reject the blocks | 11:58 |
| skittylx | wrong windows srry | 11:58 |
| brisque | I may have missed the point, perhaps | 11:58 |
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| bramc | brisque, Smoke signals would have much longer latency, which would cause all kinds of problems | 12:06 |
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| brisque | so increase the block time? point was anyway that the p2p network doesn't have much do to with anything. in fact it's preferable to have other transports. | 12:07 |
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| bramc | You could do IP over smoke signals | 12:08 |
| bramc | https://tools.ietf.org/html/rfc2549 | 12:08 |
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| dgenr8 | I could have said "I didn't say ethernet" but then I 'd get a whole different kind of nitpicking ;) | 12:13 |
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| brisque | it was hyperbole so undeserving of anything anyway. | 12:15 |
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| andytoshi | adam3us: even the two-R version doesn't seem to work, no matter what i try i'm either (a) impossible to compute or (b) trivially forgeable, you can't just choose a random j and pretend it's the signer's index | 12:56 |
| andytoshi | because in the scheme as written, you'd need to compute x_j*H(m, R_j) (which is impossible) ... if you calculate R_j as R_s in the paper (punching at s) then you have R_j depending on H(m, R_j) | 12:57 |
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| adam3us | andytoshi: so step one do you agree one can replace a_i where i!=j (they call s=j the signer in the paper) st a_i = H^i(a_0). (regardless that this identifies the signer as then you know a_j is the signer. | 13:04 |
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| andytoshi | adam3us: yes, agreed | 13:12 |
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| adam3us1 | andytoshi: ok then if you try replace R_k for R_j and still make a sig where k !=j random 1..l | 13:39 |
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| adam3us1 | andytoshi: hmm that may have a related problem. uh oh | 13:41 |
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| fenn | zooko> Do you know if there is a mailing list or otherwise how I should contact those folks? <- efnet channels #internetarchive.bak and #archiveteam-bs | 15:23 |
| fenn | or just write stuff on the wiki, the password is "yahoosucks" | 15:24 |
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| zooko | fenn: thanks! | 15:33 |
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| rusty | amiller: I'm enjoying your Research Perspectives paper. Nicely done! | 17:06 |
| amiller | ty rusty | 17:06 |
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| rusty | amiller: surprised you didn't mention the downsides of merge mining; ISTR some paper bringing up that it lowers the cost of a goldfinger attack (was Elgius vs CoiledCoin merge mined?) | 17:36 |
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| amiller | hm, we mentioned the coiledcoin story in a footnote, and didn't say anything about the downside of merge mining, thats a good point | 17:37 |
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| rusty | amiller: yes, I followed the coiledcoin reference with some interest, since I'd not heard that before. Thanks! | 17:40 |
| amiller | oh, yeah i see what you meant, yes the coiledcoin vs eligius is a perfect illustration of that so it shouldn't be hard to make that point | 17:41 |
| rusty | amiller: you repeat the 7tps number, but not sure that's accurate. Eyeballing charts gives around ~700 transactions in a ~1/3MB block, implying 2100 transactions in 1MB -> 3.5 TPS. | 17:43 |
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| rusty | amiller: I would verify that properly, but I was stupid enough to choose btrfs for my test system's root fs, and now of course it won't boot. | 17:52 |
| rusty | amiller: [98] was genuinely chuckle-worthy. | 17:57 |
| justanotheruser | amiller: even worse, I don't think the pool was used | 18:00 |
| amiller | ? | 18:00 |
| justanotheruser | IIRC, it was just the hardware he owned | 18:01 |
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| amiller | oh | 18:01 |
| amiller | well, that seems more fair in a way | 18:01 |
| justanotheruser | It also demonstrates even more strongly the downside of merged mining since only a subset of eligius was needed | 18:01 |
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| rusty | amiller: typo in Appendix X. "ADS protocols (e.g., Merkle trees) a protocols allowing a verifier ". s/ a / are /. | 18:21 |
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| zooko` | Hi rusty! Nice to see you here. | 18:41 |
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| zooko | I enjoyed the LWN article about your coin. | 18:42 |
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| rusty | zooko: thanks.... it's kind of fun to give a talk on all the ways gmaxwell is smarter than me :) | 18:42 |
| zooko | :-) | 18:42 |
| zooko | Sounds like a fun topic. :-) | 18:43 |
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| amiller | cool https://lwn.net/Articles/630805/ i hadnt seen it: Pettycoin and sidechaining | 19:26 |
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| amiller | hahahaha these slides | 19:28 |
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| jcorgan | wait...just read on the Ethereum blog: "So one of the major things that needed sorting for the next release is the proof-of-work algorithm that we’ll use." Is this thing a forever moving target? | 19:54 |
| kanzure | maybe it's a typo :-) | 19:55 |
| justanotheruser | man, it was supposed to be released three months ago and they still don't have a pow | 19:56 |
| jcorgan | to be fair the blog entry said they release Proof-of-Concept VII and VIII | 19:57 |
| jcorgan | released* | 19:57 |
| rusty | amiller: recommend the video, actually: https://www.youtube.com/watch?v=qq2EvH4eGLk . | 19:58 |
| kanzure | .title | 19:59 |
| yoleaux | Pettycoin: Towards 1.0 - YouTube | 19:59 |
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| amiller | jcorgan, it's a constantly moving target but it's been "basically" settled for at least a couple months now.. | 19:59 |
| justanotheruser | the great thing about crypto proof of concepts is "working" doesn't mean anything | 20:00 |
| amiller | justanotheruser, yeah.... the only proof is a *proof* (and that isn't a proof either) | 20:00 |
| justanotheruser | my GPG proof of concept writes random letters after messages and accepts all messages as correctly signed | 20:01 |
| jcorgan | it's probably off-topic here. i'm just sort of mystified by their dev process. if it were a commercial dev effort under sane engineering mgmt it would have been scrapped months ago i think. | 20:01 |
| kanzure | i have been wondering about plausible "shutdown" scenarios and how they should handle that in an elegant way | 20:02 |
| justanotheruser | shutdown? | 20:02 |
| kanzure | perhaps if they decided they don't have anything, they should simply start contributing to bitcoin more directly? | 20:02 |
| kanzure | yeah, i mean if they didn't want to keep all their crazy promises- what are the things they could do and still save face? | 20:02 |
| jcorgan | i long ago stopped crying over how much excess energy goes into altcoins and spirals down the drain | 20:03 |
| justanotheruser | kanzure: they will release a half-finished program | 20:03 |
| justanotheruser | I wonder what their burn rate is | 20:03 |
| jcorgan | the blog kind of reads like a high-school programming club | 20:06 |
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| kanzure | this is a fun query: site:math.stackexchange.com intitle:"intuitive explanation" | 20:11 |
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| justanotheruser | /win 21 | 20:23 |
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| maaku | rusty: the "approximately 7tps" number is assuming the absolutely smallest transaction possible | 21:24 |
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| maaku | obviously real transactions can be arbitrarily larger... | 21:24 |
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| StephenM347 | And it also assumes 1MB blocks, but I think even larger blocks tend to be around 750 kb | 21:25 |
| StephenM347 | https://github.com/bitcoin/bitcoin/blob/master/src/main.h#L51 | 21:26 |
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| adam3us1 | rusty: did you see this? http://lightning.network/lightning-network.pdf | 22:07 |
| rusty | adam3us1: is on my reading list.... you just bumped it up :) | 22:08 |
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| rusty | adam3us1: was there more than just the slides anywhere? | 22:09 |
| * rusty finds draft whitepaper... | 22:10 | |
| adam3us1 | rusty: joseph gave a presentation at the sf bitcoin meetup, i think the video should go online within a few weeks. yes that too | 22:10 |
| bramc | There's a draft paper but I have yet to read it and don't know if it's okay to redistribute | 22:12 |
| smooth | http://lightning.network/lightning-network-paper-DRAFT-0.5.pdf | 22:16 |
| smooth | both are linked from http://lightning.network | 22:17 |
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| fluffypony | justanotheruser: they'll release a half-finished program and then layer complexity on top of it to "fix" it...till they run out of money | 23:38 |
| Taek | and then they'll raise $40m more b/c people believe in them | 23:43 |
| justanotheruser | No way they'll raise another 40m | 23:44 |
| justanotheruser | the might get arrested for an illegal IPO before then | 23:44 |
| fluffypony | lol | 23:45 |
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| --- Log closed Tue Mar 03 00:00:10 2015 | ||
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