--- Day changed Thu Nov 27 2014
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00:14 < Luke-Jr> gmaxwell: I thought we merged libsecp256k1-based signing?
00:14 < gmaxwell> Luke-Jr: we did, but libsecp256k1 doesn't define how the nonce is provided.
00:15 < gmaxwell> (This is a policy I disagree with, ... but I expect it'll later be resolved by offering a higher level interface too)
00:16 < Luke-Jr> oh, is the summary outdated?
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00:37 < gmaxwell> Luke-Jr: indeed, the PR summar is outdated.
00:37 < gmaxwell> the pull was originally for openssl then both now just secp256k1.
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00:53 < sipa> i'll update the comment
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02:38 < gmaxwell> Luke-Jr: happy with https://github.com/bitcoin/bitcoin/pull/5227 's description now?
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08:05 < zooko> Slightly off-topic, but I finished a document about Tahoe-LAFS's share-placement algorithm: https://tahoe-lafs.org/~zooko/docs/specifications/servers-of-happiness.html
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10:31 < Luke-Jr> gmaxwell: lol, it wasn't a big deal :p
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16:15 < rusty> gmaxwell: am trying to apply https://en.bitcoin.it/wiki/User:Gmaxwell/block_network_coding to your server idea for the data unavailability solution.  Have many dumb questions, if you have a moment.
16:29 < rusty> gmaxwell: in particular, how would you encode the data such that the sizeof(data + overhead) responses would allow it all to be recovered?
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17:01 < kanzure> andytoshi: https://gitweb.torproject.org/tor.git/blob_plain/HEAD:/src/or/circuitbuild.c
17:03 < sipa> rusty: i haven't read gmaxwell's text, but i know it relies on forward error correction codes
17:03 < sipa> i you haven't heard about it, https://en.wikipedia.org/wiki/Fountain_code may be interesting
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17:06 < rusty> sipa: ah, thanks, that's the clue I was missing.  Well, one of them :)
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17:43 < kanzure> http://diyhpl.us/~bryan/papers2/security/The%20Pynchon%20Gate:%20A%20secure%20method%20of%20pseudonymous%20mail%20retrieval%20-%20Len%20Sassaman%20-%20Bram%20Cohen%20-%20Nick%20Mathewson.pdf
17:45 < kanzure> it always seemed a little strange to associate this work with email in particular
17:45 < kanzure> out of all the possible protocols to be working with
17:45 < kanzure> maybe that is camelflage
17:45 < kanzure> camouflage
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17:50 < kanzure> protocol spec http://web.archive.org/web/20090406081037/http://www.abditum.com/pynchon
17:51 < kanzure> http://web.archive.org/web/20090408052657/http://freehaven.net/pynchon/doc/pynchon-spec.txt
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18:13  * nsh double-underlines "replace all spaces in kanzure's papers folder with underscores" in mental to-do list
18:14 < kanzure> underscores are hard to type man
18:14 < kanzure> paperbot2 will have a tagging system
18:14 < fenn> paperbot2 will read the papers for you
18:14 < kanzure> ( paperbot2: https://github.com/kanzure/paperbot/tree/master/paperbot )
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20:20 < gmaxwell> rusty: the page there doesn't need a locally decodable code, so I don't go into an example there. Fountain codes are locally decodable though. (and with constraint can be made as locally decodable as you want)
20:21 < rusty> gmaxwell: yeah, sipa pointed me in the right direction, am playing with an implementation of simple LT fountain codes now to get a feel for it.
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20:22 < rusty> gmaxwell: I've also been thinking about the UXTO tree; I think it makes sense to combine the UXTO, consumed TXO and produced TXO trees into one hash tree.
20:24 < rusty> gmaxwell: since for checking, you always want to see (or not see) the equivalent nodes in the other trees.
20:25 < rusty> gmaxwell: and the data the server fountain-encodes looks like: [TX  ][Fee amount][TX merkle proof][Spent & consumed TXO proof].
20:26 < rusty> ... oops, I mean:
20:26 < rusty> [TX  ][Fee amount][TX merkle proof][consumed TXO proof]+[created TXOs proof]
20:27 < gmaxwell> Technically you shouldn't need to track spent data. There us unspent and you make updates to it.  (it may be adventagious to track spent things, but for your scaling purposes perhaps not)
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20:29 < rusty> gmaxwell: I think you need it, to report a missing UTXO.
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20:29 < rusty> gmaxwell: otherwise it could be missing because a TX used it, and disproving requires all the TXs.
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20:30 < rusty> gmaxwell: I was going to write up all the failure modes and proofs required for them (online, not just scribbled on my whiteboard :)
20:30 < gmaxwell> The only way it could be missing is if something updated the tree to remove it, or if something failed to add it, both of which are locally provable.
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20:31 < rusty> gmaxwell: Am assuming evil miner drops UTXO from UTXO tree, right.  You notice that, how do you prove it?
20:32 < gmaxwell> you reveal the miners update that removes the utxo, that doesn't have a transaction with it.
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20:33 < rusty> gmaxwell: am confused... I assume UTXO tree was a simple merkle hash of [TXHASH, OUTPUTNUM] included in each coinbase.  Is it something else?
20:35 < op_null> the UTXO is a database validating nodes make that contains all unspent outputs in the network.
20:35 < gmaxwell> In bitcoin it would be the complete state of the system needed to verify a new block / transaction. It's a merkleized search tree with keys {txid,vout} and values {version, height, cb flag, scriptpubkey, value}.
20:37 < rusty> gmaxwell: right, I had height and txoffset, so you could go back and ask for the rest.  But the idea is the same.
20:38 < rusty> gmaxwell: so, back to my question: how do you demonstrate "that doesn't have a transaction with it"?
20:38 < rusty> gmaxwell: demonstrating there is no transaction which used a UXTO requires all the transactions, AFAICT.  There's not compact proof.
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20:39 < rusty> op_null: sure, in this case I was referring to the idea of embedding it in the block, which has some nice properties.
20:40 < amiller> rusty, no it's a search tree, you can give a compact proof that the search returns no result
20:40 < rusty> amiller: what is a search tree?  Confused...
20:41 < rusty> amiller: specifically, what is the "it's" in your sentence?
20:41 < gmaxwell> rusty: its ordered by key (how the tree is balances is implementation defined, though non level compressed patrica trees are nice when keys are cryptographic hashes)
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20:43 < rusty> gmaxwell: so, the UTXO tree is a patricia tree, or the txs themselves are hashed into a patricia tree?  I still don't see how to prove "there's no tx which spent this txo" compactly...
20:44 < gmaxwell> rusty: basically, any datastructure can be be made autheticated, resulting in proofs O(amount of data read by someone using the data structure). So take a regular binary search tree (e.g. how you might implement a map in software), partica trie, red/black, whatever. Add hashes. The result is something with compact authenticated operations for anything that had compact operation in the original data structure.
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20:45 < rusty> gmaxwell: that's all true, but you need a sort key to do that.  Since a tx has multiple inputs, we'd need multiple sort keys, implying multiple trees.
20:45 < gmaxwell> rusty: You don't show "there is no tx which spent this txo" you show "this this change from hashx to hashy has no justification"  ... the change actually happened at some point. Thats the point you show.
20:45 < gmaxwell> rusty: ugh no.
20:47 < gmaxwell> rusty: There is a single datastructure. The set of spendable coins. Every coind has an ID and some parameters. A block starts with a prior state, given to it from the prior blocks, and then adds transactions which update that state and result in a new state, chaining one after another.
20:47 < rusty> gmaxwell: sure, OK.
20:48 < gmaxwell> So state is X,  tx Y shows up and proves some updats to X yielding state Z.  TX Q shows up and proves some updates that mutate Z to R.. and so. on.  The final state is just the last one.  If someone does something wrong one of those updates will be unfaithful, e.g. not supported by update proofs or a valid transaction.
20:48 < gmaxwell> So to prove the invalidity you show the first place its gone off the rails.
20:50 < rusty> gmaxwell: so the miner commits state after each TX, and presents them all (presumably nicely hashed into a tree for compactness)?
20:51 < gmaxwell> Or at some updated interval, if it's larger than a transaction it works too but the size sets the minimum amount you can usefully validate.
20:52 < gmaxwell> (or smaller, e.g. state updates could be per each txin and txout processed)
20:52 < rusty> gmaxwell: I'd have to think harder to be sure that you could validate a single step, without knowing the entire state at that point.
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20:56 < gmaxwell> you know the starting and ending state commitments, so {assuming the beginning state was good, this update passes the rules} is what you conclude. Maybe the initial state was BS, but if so, it would be visible in someone checking a prior step.
20:56 < rusty> gmaxwell: ah, I think I see.  If you have merkle proofs (ignoring rebalancing) of the state tree before, it provides sufficient proof (for a single txoout or txin).
20:57 < rusty> gmaxwell: right... I had never thought of encoding the state like this, but it makes sense.  OK, will return after more thought :)
20:57 < gmaxwell> even rebalancing isn't a problem though some care has to be taken so that rebalancing doesn't require touching off-path data. e.g. you should be able to compose two update proofs and not need some branch that neither contained. :)
20:57 < gmaxwell> rusty: yea, sorry, more tech we take for granted here.
21:00 < rusty> gmaxwell: You need to give a "100 future ideas for bitcoin" talk... any chance of getting you out to NZ for linux.conf.au in January?
21:02 < rusty> Damn, gtg.  Back later...
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21:02 < gmaxwell> man, that would be a murderous travel schedule; lca is 12-16  ... MIT mystery hunt in boston is on the 16th. alas.
21:03 < op_null> gmaxwell: time zones though. you could do both, almost
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21:28 < zooko> kanzure: my wife, ambimorph, wrote a tagging system this summer: https://github.com/ambimorph/protagonist
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