| --- Log opened Wed Dec 02 00:00:18 2015 | ||
| --- Day changed Wed Dec 02 2015 | ||
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| petertodd | maaku: I have, nSequence seems to be the sane thing to do; tricky bit is miner censorship of voting, which means you need jdillon's insight in asymmetric voting | 01:10 |
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| maaku | petertodd: the avenue I'd been working off of was to disincentivise censorship by e.g. having the miner's vote determine which transactions can be included | 01:11 |
| maaku | i believe that was actually your work to the mailing list some months back | 01:11 |
| maaku | the thing is I'm wondering if a practical construction can be made which works with e.g. blockchain.info or coinbase wallets | 01:12 |
| maaku | e.g. by having the vote be determined by a bit set in P2PKH and P2SH hashes | 01:13 |
| petertodd | maaku: I can't see how that'd be practical, as that'd conflict with exiting uses of those fields | 01:14 |
| petertodd | maaku: though you could make the argument that at least the distribution of votes in that case would be random, and thus cancel out | 01:15 |
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| maaku | petertodd: it wouldn't conflict.. maybe i'm not explaining well. if the LSB of a hash is set, it is a vote for, if the LSB is clear it is a vote against | 01:15 |
| petertodd | maaku: the conflict is of intent, not strictly speaking a technical issue | 01:15 |
| maaku | the user has the responsibility of generating an address that votes the way they want, but statistically those who aren't voting just add some unbiased noise | 01:16 |
| maaku | but the problem is base58 .. you can't have an easy, simple rule that a user can go by, e.g. by looking at the leading chars | 01:17 |
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| petertodd | yeah, that's a pain | 01:18 |
| maaku | anyway that seems really messy.. maybe there's a cleaner way of doing this | 01:18 |
| maaku | it's annoying many wallets don't support setting extra information e.g. nSequence or tx.nVersion | 01:18 |
| petertodd | well, they can add support for all that pretty easily | 01:20 |
| maaku | petertodd: my adversarial assumption is that the wallet author would rather cast the vote for the user | 01:20 |
| petertodd | maaku: sure, but that's what social media ruckesses are for | 01:21 |
| maaku | I don't want to hand over control of this ballot to a cabal of coinbase, circle, blockchain.info, etc. | 01:21 |
| maaku | true but i'd be more comfortable with a stronger guarantee | 01:21 |
| maaku | at least the address thing the wallet author can't muck with without redirecting / destroying your coins | 01:22 |
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| maaku | hrm. using the checksum byte (last char of address) is maybe the cleanest (relatively speaking) way to do that | 01:22 |
| petertodd | maaku: what makes you think the likes of coinbase, circle, etc. wouldn't just limit what addresses your wallet can generate? | 01:23 |
| maaku | gah this is also true | 01:24 |
| maaku | although less so for HD wallets | 01:24 |
| petertodd | maaku: HD can be brute-forced | 01:24 |
| petertodd | maaku: also, now we have to change HD infrastructure that expected you to be able to generate addresses from child chians | 01:24 |
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| maaku | hrm. other bits to play with: LSB of fee (not bias-free, unfortunately) | 01:28 |
| maaku | petertodd: where would you have stuck this? nSequence? | 01:29 |
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| petertodd | maaku: yes, nSequence, that's why I asked for the nSequence soft-forks to reserve some bits for future use | 01:29 |
| gmaxwell | did we both independantly ask for that? | 01:30 |
| petertodd | gmaxwell: probably! | 01:30 |
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| maaku | i believe so | 01:31 |
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| maaku | petertodd: have you written any code for this? | 01:40 |
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| maaku | actually n/m just thought of a simpler way to do it. should be pretty straightforward | 01:46 |
| maaku | you could even check a vote in CSV if you wanted to ensure it as part of a contract | 01:47 |
| Taek | maaku: what is the end goal with the user voting? I imagine it would be easy to manipulate via Sybils, etc. | 01:48 |
| maaku | up/down vote on security parameter which indirectly regulates block size, weighted by coin days destroyed | 01:49 |
| gmaxwell | maaku: I have an extra constraint, which maybe would make it easier, you'd want your voting scheme to at least have compact fraud proofs for the results. | 01:49 |
| maaku | i'm not sure it makes it easier, but it's simple enough to do with a merkle sum tree commitment | 01:50 |
| maaku | Taek: the coin-days-destroyed weighting should make this sybil-reistant | 01:52 |
| Taek | maaku: is the user the best person to be voting on security parameters? You might get mob-effects. | 01:52 |
| Taek | I do agree that coin-days-destroyed is probably a reasonable route to sybil resistance | 01:52 |
| maaku | Taek: if the users weighted by coin-days can't be sensible we're fucked anyway | 01:53 |
| maaku | but it's part of a larger proposal to make block "size" regulated by paid-for user demand rather than a fixed schedule or miner vote | 01:54 |
| maaku | note it is explicitly, purposefully not democratic. more bitcoins = more votes, more age on those coins = more vote | 01:54 |
| Taek | another problem, as bitcoin grows corporations are likely to start owning much larger sums of bitcoin than other users | 01:54 |
| Taek | maybe not a problem, just an observation rather | 01:55 |
| maaku | right | 01:55 |
| maaku | i'm worrying about custodians voting on behalf of the coins rightful owners | 01:55 |
| maaku | not so worried about large coin holders owning the vote. that's rather the goal | 01:55 |
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| * Taek wonders if something like this would create a marketplace for coin-days-destroyed | 01:56 | |
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| Taek | "Tunable consensus parameters via voting based on long term coin ownership." | 01:59 |
| Taek | That's a research paper I'd probably read | 01:59 |
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| stonecoldpat | I don't think coin age may be the greatest metric to use... it would give advantage to people who invest in the currency, as opposed to those who use it on a regular basis? | 02:04 |
| Taek | I was thinking something similar. Especially because you can spend $3 and use up an output that's got way more coin-days | 02:05 |
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| Taek | it's yet another optimization that wallet writers have to worry aobut | 02:05 |
| gmaxwell | it's not about the "metric" it's about preventing people from double voting by bouncing coins around, but not depriving the next owner of a coin from participating and making coins non-fungible. | 02:08 |
| Taek | gmaxwell: I don't grok. If you choose to use coin days destroyed as the method for weighting votes, you favor people with habits that accumulate coin-days destroyed (long term speculators), and isolate others (ie merchants that don't hold large coin reserves) | 02:11 |
| tulip | large shared wallets will also have cold wallets with very high days destroyed. | 02:11 |
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| gmaxwell | taek: it's not a question of "people" it's about bitcoin. CDD gives all bitcoin ownership equal weight in an ongoing measurement. | 02:12 |
| gmaxwell | it doesn't have anything to do with how much you transact... if you transact often you make many transactions with low weight and have the same influence as if you transacted infrequently. | 02:13 |
| gmaxwell | Each bitcoin owned is one foo millionth of the influence regardless of how often you transact. (and sure it should probably not count days before the scheme starts, but thats a implementation detail mostly.) | 02:14 |
| Taek | gmaxwell: to me, it's about the ecosystem. I have not analyzed carefully, but I think that there would be a poor mapping between CDD ownership and ecosystem-relevance | 02:14 |
| gmaxwell | It does bias control towards parties that hold more bitcoin; but that seems inescable in a decenteralized system. | 02:14 |
| gmaxwell | Taek: the mapping is 1:1 with coin ownership. | 02:14 |
| Taek | it may be inescapable | 02:14 |
| Taek | gmaxwell: right, but merchants may have a high level of importance without having much ownership. | 02:15 |
| Taek | especially if their business model optimizes for low variance -> minimal ownership | 02:16 |
| gmaxwell | Every bitcoin then is a 'voting share' in control of the parameter; it could be argued to be more socially just another way; but there is a logically consistent moral argument for this approach: Who owns bitcoin? The owners of Bitcoin. | 02:16 |
| gmaxwell | Taek: then there is an additional factor in their decision, I guess. | 02:17 |
| Taek | It does have this nice property of 'put your money where your mouth is' | 02:17 |
| gmaxwell | (I can also argue this other ways but I think this approach has a uniquely good property of being realizable.; schemes that give weight to future or prospective bitcoin users-- for example-- do not. Schemes that counter people, are not, .. etc) | 02:17 |
| gmaxwell | er count people* | 02:17 |
| Taek | CDD is wonderfully simple. | 02:18 |
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| gmaxwell | Taek: My bigger concern with those things is payment processors that would get huge weight by default and perhaps not have really much alignment with bitcoin long term (including because the coin isn't really theirs) ... but one can only go so far. | 02:21 |
| Taek | I think it's really just an extension of the huge weight that they already have. And, it might be good motivation for users to actually move their coins to their own control, since there's tangible political power associated with keeping your coins to yourself. | 02:23 |
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| gmaxwell | taek: doubtful, (the threat of them being stolen should be enough) -- but sometimes you have to just say "this is a failure mode, and not a bad one all considered. If this is the way the system dies, I can come to terms with that." | 02:24 |
| Taek | (failure mode in general, or just with regards to CDD voting?) | 02:26 |
| gmaxwell | I think CDD voting, at least the kind that avoid the vote censorship problems, failure modes are ones I can cope with. If the people with control of some supermajority bitcoins want to dump the system into a lake; what can I really say? | 02:27 |
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| Taek | "I told you so" | 02:32 |
| gmaxwell | yea, indeed. I mean; it's not ideal: better one person shouldn't have power over another at all... but if there must be common choice, and the forced part is reduced to the minimum possible... | 02:34 |
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| Taek | There's definitely value to accepting that there's only so much you can do. | 02:35 |
| Taek | I think CDD voting merits more exploration | 02:35 |
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| Taek | prediction markets have enormous power to bring forward information, routinely being more accurate than any other method for figuring stuff out. (ie expert panels) | 02:47 |
| Taek | and I think the generally accepted reason for their power is that there is financial cost to being wrong, and fiancial gain from leveraging knowledge | 02:48 |
| gmaxwell | prediction markets used for decisions though... they get called decision markets in the lit, and its full of reasons they don't work; I prefer to call them "all pay auctions" | 02:48 |
| gmaxwell | or "dollar auction" | 02:49 |
| Taek | gmaxwell: can you link to literature on decision markets? | 02:50 |
| gmaxwell | it's googlable, I'd have to go dig around a bit to find again the papers I found most interesting. | 02:52 |
| gmaxwell | I basically summed up the most signficant criticism of them; it's very easy for them to become dollar auctions. | 02:52 |
| Taek | prediction market : supervised learning :: decision market : reinforcement learning | 02:54 |
| * Taek should go to bed | 02:54 | |
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| kanzure | bsm1175322: perhaps you could reply to some of these dagchain questions? https://www.reddit.com/r/Bitcoin/comments/3v2vze/merkle_dag_to_increase_transactions_and_reduce/ | 07:15 |
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| kanzure | Taek: regarding your http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-November/011707.html may have been useful to link to http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-September/011158.html (mostly i am leaving this as a note for myself when i go looking in future) | 08:46 |
| kanzure | er, this was re: weak blocks | 08:46 |
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| kanzure | oh weird, apparently some of the weak block schemes are equivalent(?) to some form of dag or dagchain proposals http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-September/011172.html | 08:50 |
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| kanzure | "Torrent-style new-block propagation on Merkle trees" http://bitcoin-development.narkive.com/dGIxjVI5/torrent-style-new-block-propagation-on-merkle-trees | 08:54 |
| kanzure | oops i should have used for the last link instead http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-September/011176.html | 08:56 |
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| bsm117532 | The incentive formula I have for a DAG incentivizes fast block transmission, and will force us to optimize p2p relay of blocks... | 10:45 |
| bsm117532 | kanzure: I've said it before but we're going to be talking at Scaling about faster underlayers for bitcion blocks, and I think the thinking will converge (to a DAG. ;-) | 10:45 |
| bsm117532 | I do think that block relay should occur after verifying PoW but before verifying the rest... | 10:50 |
| bsm117532 | Because verifying PoW is enough to discourage any kind of block spam attack. | 10:50 |
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| kanzure | do weak blocks eliminate the effect of block size on orphan rates? | 11:03 |
| kanzure | a miner's competitor's orphan rate is reduced by the competitor publishing weak blocks that others accept/validate/propagate, which presumably can make up for the competitor's lower bandwidth or lower connectivity for pushing out their blocks to a sufficient hashrate-wielding portion of the network. | 11:04 |
| kanzure | but larger miners can just flood and saturate the network with larger weak blocks anyway, reducing available bandwidth to handle smaller miner low-bandwidth smaller weak blocks. | 11:04 |
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| kanzure | you could use dynamic-adjustment flexcap proposal stuff to enforce a preference for smaller weak blocks, but if you prefer smaller weak blocks then a larger miner can simply produce more smaller weak blocks | 11:05 |
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| kanzure | s/produce more smaller weak blocks/produce more (as in additional/extra numerous) smaller weak blocks | 11:06 |
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| gmaxwell | kanzure: thats what I mean by absent strageic behavior in https://www.reddit.com/r/Bitcoin/comments/3uz0im/eli5_if_large_blocks_hurt_miners_with_slow/cxknwsh?context=4 | 11:13 |
| kanzure | in http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-November/011707.html taek talks about the adversarial case for high-bandwidth larger miner propagation of big blocks with possibly pathological validation (or just big blocks, whatever), but no mention of big weak blocks as pushing out small weak blocks and thus big block miners winning out over small block miners even in the weak block rac.e | 11:13 |
| gmaxwell | The elimination is only obviously true absent strageic behavior. If a large miner intentionally doesn't go along with the scheme, the effect comes back and it's in their favor. | 11:14 |
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| gmaxwell | But this is intutive handwave, I'm not actually sure how that breaks down with any particular weak block scheme. | 11:14 |
| kanzure | "The orphan rate for weak blocks is going to be substantially higher for smaller miner, due to the increased rate of appearance. I do not think that this is going to create any issues, because small miners are still going to have high visibility of the longest weak-block chain, and are still going to be able to create blocks that are nearly as full as the blocks created by larger miners." | 11:15 |
| kanzure | i think this quote might have accidentally flipped the concerns regarding orphan rates, but not sure.. still thinking. | 11:16 |
| bsm117532 | One thing I'm excluding from my talk: my DAG construction can allow each node to choose an incoming difficulty that they will accept. Separate from that one can have miners "bundle" blocks into a higher work block. | 11:17 |
| bsm117532 | However all you're really saving is PoW headers, maybe a factor of 2 in bandwidth at most. There's a natural max (weak/DAG) block rate and that's the transaction rate. Don't send PoW blocks with no transactions. | 11:18 |
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| kanzure | i think that if the weak blocks are too large, then not only do you have to worry about smaller miner weak block orphan rate, but you also have to worry about smaller miner ability to get the big weak blocks. i think that the size of blocks and the size of weak blocks is going to have some proportional relationship. (just a guess) | 11:20 |
| gmaxwell | kanzure: my assumption was always that the weak blocks themselves were sent relative to other weak blocks and using contextual compresison or set reconcilliation. | 11:21 |
| kanzure | big weak blocks don't help smaller miners if the smaller miners are unable to download all the big weak blocks. iirc initial propagation of low-bandwidth smaller miner big blocks is also going to effect download of big weak blocks and big blocks by smaller miners..... as long as the smaller miners are validating (sigh). | 11:21 |
| kanzure | er, by which i mean to say, just as initial propagation, by smaller miners of their own big blocks, can effect their orphan rate in a big block world, the same can be said for a network with big weak blocks that they are unable to download quickly enough (it's similar to the reasons why smaller miners had initial propagation problems for their big blocks). | 11:24 |
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| bsm117532 | BTW, do weak blocks contain transactions? Or only the leaves for the Merkle tree? | 11:25 |
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| bsm117532 | I still wonder why Bitcoin blocks contain transactions...why not exclude them since they can be obtained by p2p? | 11:26 |
| kanzure | and not to beat a dead horse, but to make my other statement more clear regarding relationship of weak block size to block size, the received weak blocks ideally have to encode all of the transactions that are going to be appearing in the big block later, so the number of weak blocks times the weak block size will determine the amount of data that has to be downloaded by the smaller miner, in a world with big blocks and weak blocks ... | 11:27 |
| kanzure | ... (possibly a world with big blocks and big weak blocks). | 11:27 |
| sipa | bsm117532: latency | 11:27 |
| kanzure | doesn't matter, at some point the transactions have to be sent. it's true that the block headers can be propagated far more quickly, but the transactions still have to be sent and validation still has to happen at some point. | 11:27 |
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| kanzure | plus, you don't want vulnerabilities regarding network propagation of unvalidated block announcements because yikes | 11:28 |
| kanzure | (flooding, bandwidth competition, etc) | 11:28 |
| sipa | there are certai ly more efficient encodings possible, but you can only validate the block with whole blocks | 11:28 |
| bsm117532 | sipa: latency to verify the block? Because it will take me longer to retrieve missing transactions? It wouldn't be so bad if we relayed the header before verifying. | 11:28 |
| sipa | bsm117532: block withholding attacks | 11:29 |
| sipa | you don't want a miner to withhold the tx data from the network, and have the network build on top | 11:29 |
| bsm117532 | Yeah I'm going to bury that horse. There's no block withholding attack in my DAG. | 11:29 |
| sipa | ok, curious about that | 11:29 |
| bsm117532 | No one would mine on top of a block they can't verify... | 11:29 |
| kanzure | isn't that what we said about uh.. | 11:30 |
| bsm117532 | you eliminate orphans, you eliminate block withholding. Also I've explicitly made a block reward which incentivizes fast transmission. | 11:30 |
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| kanzure | the origin of orphan rate is lack of bandwidth so seems intuitively hard to imagine that somehow transitioning from "small miners have problems uploading big blocks" to "small miners have problems downloading lots of (possibly big) weak blocks" will somehow fix lack of bandwidth | 11:34 |
| bsm117532 | The origin of orphans is one of the 8 fallacies of distributed computing. | 11:34 |
| bsm117532 | It's is simply impossible for causally disconnected miners to have synchronicity. | 11:35 |
| bsm117532 | I've converted orphans to "siblings" in a DAG. BOTH miners get a fair share, and their work is proportional to their difficulty. | 11:36 |
| bsm117532 | A "sibling" is a block that cannot be ordered to come before or after mine using the DAG's partial order. | 11:36 |
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| bsm117532 | *their reward is proportional to difficult. (not work...) | 11:37 |
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| kanzure | (big) weak block propagation is subjected to same effects as big block propagation, so will probably use speedups like IBLT etc. etc... in which case small miner bandwidth/download problem goes away for those (big) weak blocks. but if transaction rate goes above available bandwidth anyway, you are still not going to be able to see everything. | 11:44 |
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| bsm117532 | Scaling bitcoin means scaling bandwidth. There's no way around that. | 11:46 |
| kanzure | transaction cut through works without "scaling bandwidth". | 11:48 |
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| kanzure | there have been many non-bandwidth scaling proposals http://diyhpl.us/~bryan/irc/bitcoin/scalingbitcoin-review.pdf | 11:49 |
| bsm117532 | Also makes bitcoin less useful. Yes we could stay with 1MB block sizes and do nothing... | 11:49 |
| kanzure | why is that perceived as doing nothing and less useful? | 11:49 |
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| bsm117532 | I thought there was consensus on growing to higher transaction rates? | 11:50 |
| bsm117532 | If not, I'll make an altcoin for it. :-P | 11:50 |
| kanzure | that doesn't answer my question | 11:50 |
| kanzure | transaction cut through can have insanely high transaction rate. i gave you an example of non-bandwidth scaling. your retort was that it's "doing nothing and less useful". | 11:51 |
| bsm117532 | I don't know what "transaction cut through" means. | 11:51 |
| kanzure | page 36 | 11:51 |
| bsm117532 | You're effectively describing Lightning. | 11:52 |
| bsm117532 | I'm a big fan. | 11:52 |
| bsm117532 | I think we need to do both. | 11:52 |
| kanzure | lightning is not a good way to describe the superset of.. this stuff. | 11:52 |
| bsm117532 | Perhaps not... | 11:52 |
| kanzure | ((yesterday i wrote what i consider to be a good comment that points out that for payment channels the idea of lightning and other methods is to add constraints around the possible behavior for zero-conf transactions. hopefully this helps as far as perspective about zero-conf but who the hell knows.)) | 11:53 |
| rusty2 | kanzure: weak blocks can also be thought of as spreading the load, "pre-sending" blocks and then finishing it at the last minute. Depends whether constraint is total bw or block transmission latency. | 11:53 |
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| bsm117532 | Lightning is an answer to zero-conf, AFAICT. | 11:53 |
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| kanzure | yes i had briefly considered that more temporally-consistent load during the periods between block finding might be helpful, but not sure whether that is enough to say eliminates orphan rate effect of big blocks | 11:54 |
| bsm117532 | Let's make the orphan rate zero. | 11:54 |
| kanzure | bsm117532: there's so many ways to scale bitcoin without sacrificing bandwidth that i'm not convinced that doing both is necessary | 11:54 |
| bsm117532 | Rather than arguing about how large is too large. | 11:54 |
| kanzure | bsm117532: you just got done saying it's impossible to have zero orphan rate, you know :) | 11:54 |
| bsm117532 | Lightning is only a way to scale bandwidth if you don't count the bandwidth of lightning itself. | 11:55 |
| kanzure | i did not claim that lightning stuff scales bandwidth | 11:55 |
| bsm117532 | kanzure: I didn't say that! It's impossible in Bitcoin. ;-) | 11:55 |
| kanzure | lightning bandwidth stuff is unrelated to bitcoin bandwidth requirements, as far as i know | 11:55 |
| bsm117532 | Argh fingers. | 11:55 |
| bsm117532 | Lightning is only a way to scale *bitcoin* without scaling bandwidth if you don't count the bandwidth of lighting itself. | 11:56 |
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| kanzure | why should i count lightning bandwidth? | 11:56 |
| bsm117532 | Why not? What are you interested in? | 11:56 |
| kanzure | i could see an argument for counting lightning bandwidth when everything gets dumped to bitcoin in the event of a tremendous catastrophe, but dunno | 11:56 |
| kanzure | *gets dumped to bitcoin blockchain | 11:56 |
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| kanzure | we should probably just stop talking about lightning and instead mention zero-confirmation transactions that are collectively linked to anchoring confirmed commitment transactions, might make it easier on the zero-conf people to understand abilities to restrict previously-undefined behavior of zero-conf transactions. | 11:59 |
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| kanzure | bsm117532: btw i still consider my question "why is that perceived as doing nothing and less useful?" as unanswered. i have also successfully refuted your "scaling bitcoin means scaling bandwidth" claim. | 12:01 |
| bsm117532 | I'm using lighting as a synonym for what you wrote. I haven't seen other proposals than lightning itself. | 12:01 |
| bsm117532 | kanzure: Transaction volume *will* go up. Bitcoin has a number of arbitrary, artificial limits. What's the point of those limits? I seek to remove them. | 12:02 |
| kanzure | stroem, atomic swaps, bluematt's micropayment channel stuff in bitcoinj, thunder network (matsjj), amiko pay, lots of other payment channel designs have been proposed in the past (probably a few by tiernolan that i can't remember) | 12:02 |
| kanzure | bsm117532: perhaps you should seek first to understand heh | 12:03 |
| bsm117532 | kanzure: let me reverse the question: what's the benefit of keeping transaction volume low? | 12:03 |
| kanzure | smaller miners | 12:03 |
| kanzure | we just had this conversation yo | 12:03 |
| kanzure | but also, i showed that you can offload transaction volume without impacting bitcoin blockchain bandwidth requirements | 12:04 |
| kanzure | (while still using bitcoin transaction data structures) | 12:05 |
| kanzure | ((or at least the necessary pieces? w/e)) | 12:05 |
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| bsm117532 | yo. ;-) | 12:07 |
| kanzure | yea keeping it real | 12:07 |
| bsm117532 | what do you mean "smaller miners"? | 12:07 |
| bsm117532 | Let me show you how to get rid of pools with a DAG... | 12:07 |
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| kanzure | what was the point of reversing the question? i can only assume that you expected that my answer would help me understand why you perceive scaling bitcoin in a non-bandwidth capacity to be "doing nothing and less useful", but i have to admit, my answer does not help me see how you could believe that. | 12:09 |
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| bsm117532 | What you call "cut-through" is a damn good idea and needs to be done. Perhaps you wouldn't call my work "scaling" then. Rather it's miner decentralization, orphan elimination, and smoothing the income distribution for miners. (And it comes with the possibility that the tx rate is proportional to bandwidth and CPU alone, free of artificial restrictions) | 12:12 |
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| kanzure | btw for clarity about zero-conf stuff: bandwidth requirements for passing zero-conf transactions around can be entirely out-of-band of blockchain transaction propagation and blockchain block propagation. there can be far more zero-conf transactions that exist that will never be using the bitcoin blockchain bandwidth. so the bandwidth should not be counted. i gave a specific example of where the bandwidth of offloaded zero-conf ... | 12:14 |
| kanzure | ... transactions should be considered, namely in protocols like lightning when many many transactions get dumped to the blockchain due to unfortunate systemic risk regarding misbehaving parties. but lots of tools can be built to help try to mutually resolve those problems in a timely manner that nobody has explored yet (to my knowledge). not worried about that really. (or, instead of tools for after the event has occurred, you could ... | 12:14 |
| kanzure | ... have tools that check the systemic risk prior to any catastrophic event too. but same as the other, i don't think anyone has proposed this yet.) | 12:14 |
| instagibbs | bsm117532, (trying to be nice) stop insinuating you've solved decentralized distributed ledgers and write up a technical whitepaper that relates it to the previous DAG attempts. | 12:14 |
| instagibbs | that is to say, write up your idea. Not the first DAG idea, and most will simply ignore unless you do the work. | 12:14 |
| bsm117532 | instagibbs: I have. I am. | 12:14 |
| instagibbs | great! | 12:15 |
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| bsm117532 | Sitting at 14 pages right now. Doing some simulations. | 12:15 |
| kanzure | er, to further clarify my previous comment, zero-conf transactions can still be relayed over the bitcoin blockchain for when they are intended to get into the blockchain, but parties can easily transact with each other in a way where they agree not to transmit the zero-conf transactions over the p2p bitcoin network. as you increase the number of parties privy to your individual zero-conf transaction, you of course increase the risk ... | 12:15 |
| kanzure | ... that someone is going to dump it on the blockchain because they are poopheads. | 12:15 |
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| instagibbs | then until then don't expect people to believe you, especially when you call real-world limitations artificial, with respect to Bitcoin at least | 12:15 |
| bsm117532 | instagibbs: FWIW this isn't my first rodeo. I've got 30+ academic papers. I don't expect anyone to believe me. This whole IRC thing is weird. | 12:16 |
| kanzure | irc is definitely weird and full of butts | 12:16 |
| instagibbs | you're the millionth person on wizards with a FANTASTIC idea. Not the first DAG one either :P | 12:16 |
| bsm117532 | instagibbs: I'm well aware. ;-) | 12:16 |
| instagibbs | so yeah, I hope you're right, but like, yeah | 12:16 |
| instagibbs | ;) | 12:16 |
| kanzure | so was that transaction rate proportional to global net average bandwidth, or was that proportional to local per-node bandwidth in the same sense as sharding schemes? | 12:18 |
| instagibbs | In the end you'd still be bounded by bandwidth to participate, I assume. Which means there still are "artificial" limitations. | 12:18 |
| bsm117532 | global. You don't get local without sharding. | 12:18 |
| bsm117532 | instagibbs: 10 minutes is more artificial than global bandwidth (which can be optimized/upgraded) | 12:19 |
| kanzure | so you mean global bandwidth assumptions or do you mean actual global bandwidth? and why would a 100 kilobyte/sec miner not count as global bandwidth? | 12:19 |
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| bsm117532 | Each miner needs to able to suck down the entire blockchain, right? That's the limit... | 12:19 |
| kanzure | for new nodes? yes | 12:20 |
| bsm117532 | And technically with 3tps we're at like 3kbps, which is nothing... | 12:20 |
| kanzure | *for new miner nodes? yes | 12:20 |
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| kanzure | yes but you still have to say whether you are making assumption about new miner bandwidth requirements, or if you are somehow measuring actual new miner bandwidth. and also, existing miner bandwidth matters somehow. | 12:21 |
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| kanzure | oops sorry i don't mean requirements | 12:22 |
| bsm117532 | It's the required synchronicity of adding a node to a linked list that causes all the problems. It requires locking for multiple writers, and we have no locking. Another model is to allow non-conflicting simultaneous writes. That's what you get with a DAG. | 12:22 |
| kanzure | it's true that a new miner has to download the entire blockchain. however, existing miners do not. they only have to keep up with the blockchain. and the limit to "keeping up" is... tada, bandwidth. | 12:23 |
| bsm117532 | kanzure: I'm referring to the steady state (already have blockchain) bandwidth. | 12:23 |
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| bsm117532 | If we just had smaller, faster blocks, we could divide the 1MB blocks into 3kbps, and everyone has that much. further scaling of transaction rate is then proportional to the bandwidth. | 12:24 |
| kanzure | why was i talking about "keeping up"? wasn't i supposed to be talking about miners? i'm not convinced that i am listening to myself at the moment. | 12:25 |
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| bramc | Here's a depressing thought: Let's say that China passed laws including a list of 'bad' utxos, and had a policy that all miners in china needed to attempt to orphan any block which included a transaction which included a descendant of one of those for a block or two. If the list was public, then other miners would have incentive to orphan those blocks as well, which would lead to other miners having a yet even stronger i | 12:54 |
| bramc | ncentive, until it became a de facto soft fork that those utxos were unspendable. | 12:54 |
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| kanzure | i think that's another way of saying it's important to have lots of mining that is smaller than the level where it becomes necessary to operate as a business entity | 12:57 |
| kanzure | by mining i mean fully-validating mining | 12:57 |
| bsm117532 | Down with pools! They're full of pee anyway. | 12:57 |
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| kanzure | also it is interesting to point out the differences between business broadband pricing vs consumer/residential bandwidth pricing in most areas. for the longest time i have seen bizarre workshops (like machine shops) totally skip on internet connectivity, but only recently realized that it's probably because of the insane prices... | 12:58 |
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| aj | the above would make it illegal to SPV mine, at least on top of any blocks that might mine blocks spending those verboted UTXOs... | 12:58 |
| bramc | aj None of the big miners in china are spv mining | 12:58 |
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| MRL-Relay | [othe] bramc, antpool and f2pool (discus fish) are imho still spv mining. (at least f2pool said so: https://bitcointalk.org/index.php?topic=700411.msg11791194#msg11791194) | 13:05 |
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| fluffypony | yeah I was about to say the same | 13:05 |
| bsm117532 | We need some kind of "proof of validation". There's no reason we shouldn't take measures to force them to stop mining, or to do full validation. | 13:07 |
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| instagibbs | soft-fork in a recursive snark proof. simple! | 13:16 |
| kanzure | bramc: i dunno where this was mentioned but gmaxwell might have had at some point a method for discouraging transaction censorship | 13:16 |
| bsm117532 | instagibbs is snarky today. ;-) | 13:17 |
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| instagibbs | im also containing zero knowledge | 13:17 |
| bsm117532 | Hahaa | 13:17 |
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| instagibbs | seriously though, I think that'd be the answer to your question: proof of faithful computation | 13:18 |
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| bsm117532 | It is the answer. It's also computationally intractible. | 13:18 |
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| kanzure | would be interesting to see if non-profit-motivated small mining is sustainable (e.g. miners not in a race to get as huge as possible compared to their competitors) | 13:18 |
| kanzure | i think the argument was that if you are not getting any of the blocks then why bother mining? something about orphan rate increase due to size of competitor's big blocks. | 13:19 |
| kanzure | not sure how that argument goes | 13:19 |
| bsm117532 | Nothing to do with large blocks, just to do with large block rewards. If my expectation is that I'll get one block per year, I'm not going to bother. We need smaller rewards. | 13:20 |
| kanzure | why are you not going to bother? | 13:20 |
| bsm117532 | Push it to 10 years. At some point no one will bother. | 13:20 |
| bsm117532 | If my income was 25BTC/year, but I don't know when I'm going to get it...you can't plan expenses around that unless you subsidize the operation... | 13:21 |
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| kanzure | if the operaton is subsidized (with small enough mining, that's trivially doable), my question was why would you not bother if low reward rate? | 13:22 |
| bsm117532 | At that point you're not doing it for the money... | 13:23 |
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| bsm117532 | You asked if "non-profit-motivated small mining is sustainable" -- i guess I'm interpreting that as making a profit. ;-) | 13:23 |
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| kanzure | well i guess the question is really asking about the sustainability of whatever the other motivations are, heh | 13:24 |
| kanzure | or, rather, if the subsidy is sufficient to keep up with linear blockchain growth | 13:24 |
| bsm117532 | Which is really asking how much money are people willing to throw away on a hobby? | 13:24 |
| kanzure | actually no, i mean presumably it should be possible to stick more towards the lower end of that rather than how much they would at most be willing to "throw away" | 13:25 |
| bsm117532 | Heh we have a couple mining rigs in the office, because our office lease includes free electricity! (just for demonstration, really) But we have to mine on a pool, so not validating. :-( | 13:26 |
| kanzure | you mean your example is only a demonstration, or the rig was real and the reason was for in-office demos? | 13:27 |
| bsm117532 | The latter. Here's a photo: http://blog.sldx.com/can-proof-of-work-be-useful/ | 13:27 |
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| kanzure | hashrate consolidation even in absence of pools would be almost samely problematic, i think | 13:33 |
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| kanzure | re: "block propagation time is already irrelevant because of the existence of spv mining activity". no, block propagation was about the competitor's orphan rate. | 14:48 |
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| kanzure | can someone fact-check my reply regarding "orphan rate is about a miner's competitor's orphan rate"? https://www.reddit.com/r/Bitcoin/comments/3uz0im/eli5_if_large_blocks_hurt_miners_with_slow/cxl0728?context=5 | 15:31 |
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| el33th4x0r | nice reference to Zohar's SM paper. | 15:35 |
| el33th4x0r | so funny to see people think that selfish mining was debunked. | 15:36 |
| kanzure | yeah i think the argument he might be thinking of is "miners wont behave in a way that breaks the network, because then their BTC becomes worthless" but miners can easily not care about BTC, and we should not dramatically reduce barriers for attacks | 15:37 |
| el33th4x0r | i thought that argument had been debunked. :-) | 15:38 |
| kanzure | i have no idea, i sort of lost track. | 15:38 |
| el33th4x0r | every argument that begins "no one would do that, because [in my model and according to my limited understanding where I project my goals onto others] it would not be in their rational self-interest" is flawed. | 15:39 |
| el33th4x0r | more seriously though, I think he is pointing out that slow propagation of blocks is in some way akin to a block withholding attack. | 15:39 |
| kanzure | well he's certainly not being lucid about that point | 15:39 |
| el33th4x0r | well, take large miner, say >33%. if his blocks are taking a while to propagate to the network, he is, in essence, launching an unintentional SM attack. | 15:40 |
| kanzure | "The effect of slower propagation on mining is not punishing the party "with" slow propagation. "With" implies a privileged reference frame. From the point of view of a miner behind a tin-can-and-string link, it's the world that has slow connectivity." | 15:41 |
| el33th4x0r | right, you were right on the dot with that. | 15:41 |
| kanzure | (note: that was gmaxwell not me) | 15:41 |
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| el33th4x0r | ok gmaxwell was right. And the other fellow's bringing up SM is apropos, because to the rest of the world, it looks like the miner is selfish mining, because he is holding his blocks back from the rest of the network. | 15:43 |
| kanzure | trying to visualize a bitcoin mining network graph with all of the bandwidth asymmetries represented, hard to visualize but i think they might be edge weights or something that count higher over time | 15:44 |
| kanzure | er i guess you also have to visualize hashrate consolidation over time on same graph structure, so nevermind. not gonna try that one. | 15:44 |
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| kanzure | not sure what to do about resemblance to selfish mining, if anything that sounds like his argument is "miners wont buy mega-awesome bandwidth and connectivity, because they will be basically performing a selfish-mining attack"? | 15:49 |
| kanzure | the orphan rate stuff was re: increasingly big blocks, so maybe his argument was "larger miners won't both buy mega-awesome bandwidth and also won't be sending over increasingly big blocks, because that would be essentially similar to selfish mining" | 15:50 |
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| kanzure | oh his other post is even stranger. hm. | 15:52 |
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| kanzure | specifically the weirdness is this one: "Blocksize should have an effect on orphaning, that's how miners can make sure that no absurdly big blocks get mined. Without the blocksize limit that is what would keep blocks smaller (until better block propagation software arises)." | 16:05 |
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| kanzure | can someone fact-check my other reply? thanks https://www.reddit.com/r/Bitcoin/comments/3uz0im/eli5_if_large_blocks_hurt_miners_with_slow/cxl28zx?context=2 | 16:25 |
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| kanzure | not completely sure i have the right overview of orphaning in my last two comments. | 16:35 |
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| el33th4x0r | this discussion needs some metrics. Ittay and I defined some in the NG paper (http://arxiv.org/pdf/1510.02037.pdf). of particular concern here is "fairness" | 16:45 |
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| el33th4x0r | we'd expect the orphan rate observed by miners to vary depending on miner's network speed as well as hash power. a small miners is always going to be at a disadvantage compared to a large miner, because the latter has a higher probability of building on his own block. | 16:47 |
| el33th4x0r | the question is, how big are these differences? are they worth worrying about? or are they in the noise compared to the already inherent variance? | 16:48 |
| kanzure | inherent variance noise is surely not a factor when smaller miners can't broadcast/publish/upload quickly enough. in the case of weak blocks, the problem is just flipped around and the smaller miner has trouble downloading all the big weak blocks. | 16:50 |
| kanzure | (although there are definitely some benefits to flipping the problem around, it's just not necessarily a solution of the problem at hand) | 16:51 |
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| kanzure | i wonder if you could do global high-bandwidth radio broadcast of big weak blocks....... | 16:52 |
| kanzure | where is jgarzik's satellite company when you need him? bah | 16:53 |
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| kanzure | jcorgan: poke | 16:54 |
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| kanzure | oh i guess that would have to limit bitcoin devices to those that have giant antennaes connected to their local network... but that might be okay. i have always wanted an excuse to increase the number of giant antennaes everywhere. | 16:57 |
| midnightmagic | bitcoin price stopped rising and it was no longer realistic, i think | 16:59 |
| kanzure | i am going to prefer the alternative version of events in my head, like "elon musk said so" | 17:00 |
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| kanzure | el33th4x0r: in particular i mean that weak blocks definitely help the bandwidth requirement be less spikey and more normalized (if that's the right word) | 17:01 |
| jcorgan | kanzure: yes? | 17:02 |
| kanzure | a graph theoretic person (maybe amiller) should study whether there are 5,000-node graph structures for the bitcoin network where a single node at any location could selectively impede bandwidth from some miner and dramatically decrease chances of that miner getting a block. | 17:03 |
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| kanzure | jcorgan: hi, yes, i was wondering about prospcts for giant worldwide radio broadcast of big weak blocks. and sdr receiver antennaes everywhere. to route around bandwidth asymmetries on current interwebs. | 17:03 |
| el33th4x0r | yeah what happened to the microsatellite idea? | 17:04 |
| midnightmagic | mapping such a graph would require a sybil'ing the network and is thus unethical to study | 17:04 |
| kanzure | midnightmagic: no i mean fake graph | 17:04 |
| kanzure | midnightmagic: like, feasability | 17:04 |
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| jcorgan | kanzure: three ways to do it | 17:04 |
| jcorgan | via satellite, see BitSat project | 17:04 |
| kanzure | and what about noise/interference/pirates | 17:05 |
| jcorgan | via terrestrial piggybacking, see Finnish project to send blocks via program stream in DTV signals | 17:05 |
| jcorgan | via dedicated broadcast for metro area, see gr-bitcoin with gnuradio | 17:06 |
| el33th4x0r | kanzure: NG distributes the bandwidth usage more evenly over time. weak blocks aren't as good at doing the same -- they seem open to abuse. | 17:06 |
| el33th4x0r | jcorgan: we have student teams build microsatellites and they go up for free on certain launches. the difficulty seems to lie with radio freqs, at least, that's what they said. | 17:07 |
| jcorgan | true, but Dunvegan (jgarzik) has scoped out many of the issues and has plans underway for a stack of 3 cubesat | 17:08 |
| el33th4x0r | cool. | 17:08 |
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| jcorgan | i don't know whatever happened to the DVB-T broadcast project. Last I heard they had some proof of concept working but the cost to actually broadcast was something like 2K USD per month to add their MPEG TS stream to a real station. Would have covered much of Finland and Sweden, I think. | 17:16 |
| jcorgan | the receiver would have been one of those RTL-based DVB-T receivers (10 USD), and the idea was that vending machines, etc., could cheaply receive the block chain and only use costly bandwidth for admin | 17:17 |
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| rusty | jcorgan: AFAIK Dungvan folded. I thought it overly ambitious anyway; we don't want a group of three cubesats, we want many sats at completely independent launches. I felt a simple broadcast of block headers gives you 90% of the benefit, and can fit in a small unit which you can pay other cubesats to carry for you (thereby dropping their costs). | 17:45 |
| jcorgan | i wasn't aware. i consulted for them on the radio link parameters and ground station requirements, but haven't been involved for at least a year | 17:48 |
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| kr00k | Hi everyone! | 17:54 |
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| maaku | there are student designed cubesats going up every year on government subsidy | 18:20 |
| maaku | haveing a plug-in block header relay module would be very inexpensive | 18:20 |
| rusty | maaku: exactly. And for this you want numbers for coverage. Given the avg cubesat lasts about 6 months, you want big numbers, too. | 18:23 |
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| maaku | the bigger problem is intersat relay. a block-relay cubesat is pretty useless if it only intermitantly talks to whatever ground station is under it | 18:24 |
| jcorgan | a big challenge is that none of them (nor the originally planned BitSat's) will have the available transmit power to have receivers with simple, fixed antennas | 18:24 |
| jcorgan | all would require pointable tracking dishes to have enough gain | 18:24 |
| maaku | well not useless, but not as useful as it could be | 18:24 |
| el33th4x0r | aren't the delays to bounce to those altitudes so huge to make ths a non-starter? | 18:25 |
| maaku | would sitll let you know if there are more-work blocks you haven't been hearing about | 18:25 |
| rusty | maaku: yeah, you need multiple ground stations, you also need as jcorgan said, to try to reduce the kit needed to receive signals. | 18:25 |
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| maaku | el33th4x0r: altitudes of 200km? | 18:25 |
| rusty | maaku: AFAICT that's the entire point. | 18:25 |
| rusty | (Or at least, see my comment on "90% of the benefit") | 18:25 |
| maaku | rusty: talk in scrollback was about sidestepping terrestrial broadcast links | 18:26 |
| rusty | maaku: yeah, people talk a lot :) The reason I donated to the initial dungvan raise was because having alternate (even wacky!) anti-sybil methods is useful to the robustness of the system as a whole. | 18:27 |
| rusty | I also considered creating a "blockhdr by sms" subscription service. | 18:28 |
| jcorgan | in my more paranoid moments, i always figured a constellation of blockchain emitting cubesates would make good target practice for ThePowersThatBe(TM) :-) | 18:29 |
| kanzure | since when is venture capital considered a donation? :p | 18:29 |
| rusty | kanzure: the very early exploratory money (20BTC IIRC, at a point where that was over USD10k) was very clearly a donation :) | 18:30 |
| kanzure | huh, didn't know. ok. | 18:31 |
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| rusty | kanzure: https://bitcointalk.org/index.php?topic=334701.0 | 18:32 |
| kanzure | btw i think tiernolan came up with near blocks a few years ago | 18:34 |
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| kanzure | https://bitcointalk.org/index.php?topic=179598.0 | 18:35 |
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| maaku | jcorgan: I highly doubt any nation would risk the international incident that would result from bombing a satellite | 18:36 |
| jcorgan | i was joking, of course, but you don't need to bomb it, just fry an LNA or two. "Satellites fail all the time!" | 18:37 |
| maaku | (not because "hey you shot down my satellite!" but because the debris would cause real economic damage) | 18:38 |
| maaku | ah yeah that would probably work against a non-hardened cubesat | 18:38 |
| kanzure | re: sharding as only way to reduce local bandwidth, would probably be good to have once-a-month block shard with lowest possible bandwidth requirements. | 18:38 |
| kanzure | high-latency low-bandwidth blocks would be v. v. useful for decentralization purposes | 18:39 |
| kanzure | also with absurdly small block size | 18:40 |
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| bramc | You don't need to 'bomb' a satellite. Hitting it with a piece of dust would do the trick. | 19:36 |
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| maaku | bramc a kinetic impactor would have all the same issues of creating space junk | 19:41 |
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| bramc | maaku, Sort of. The thing doing the impacting could be very small. The satellite itself would be some serious space junk though. | 19:42 |
| aj | if it's a bit of dust impacting the sat, it'll just stay mostly in the same orbit though, which for cubesats will decay in a few months anyway? | 19:43 |
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| * TD-Linux would love to see bramc's piece of dust that can precisely impact an orbiting satellite at very high relative velocities | 21:02 | |
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