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03:33 < waxwing> i just looked up DMMS in sidechains.pdf and noticed that it describes DMMS but doesn't attempt to formally define it. am i imagining it, or did an earlier draft have some kind of definition?
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07:11 < andytoshi> waxwing: there is a pseudo-definition in pos.pdf .. that is as close as i got to a formal definition
07:12 < waxwing> andytoshi: ok, thanks. that's probably what my memory was pinging me about, then.
07:14 < andytoshi> i had spent a while trying to define it widely enough that pos would sensibly fall under the definition (then i could argue it didn't satisfy the security property because of costless simulation) but i wound up either defining it so broadly that there was no cost requirement and basically no security definition, or so narrowly that only proof-of-work could satisfy it
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07:18 < andytoshi> at the time we wrote the sidechains paper we thought that the dynamic-membership thing was super important because we cared about mining decentralization and censorship resistance, which are the properties that sidechains need. intuitively that's totally orthogonal to whether robust consensus can be achieved .. for that it seems like the cost requirement of PoW is the most important thing, and
07:18 < andytoshi> dynamic membership is basically a consequence of that rather than the other way around.
07:19 < andytoshi> at the time i didn't think bitcoin could be so resilient if its mining centralization story didn't get dramatically better, but history has proven me wrong, and now my thinking is that DMMS is not really a useful way to think about what PoW gets us
07:21 < waxwing> i think the signature being on work rather than an identity is pretty central. but i tend to look at these things in vague, handwavy ways :)
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07:23 < andytoshi> yeah, i like "signature of work", we should've used that rather than "dynamic membership" as the main feature of the signature
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07:24 < andytoshi> but at the time i was very concerned about having enough miners to prevent censorship (now i focus on doing things that miners simply cannot detect :P), and also debunking the NXT/peercoin proof-of-stake hotness (which has since evolved into systems that are reasonably open about having totally different trust models
07:28 < kanzure> "Revisiting difficulty control for blockchain systems" https://eprint.iacr.org/2017/731.pdf
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10:02 < dgenr8> eclipse attack detected
10:06 < waxwing> the sun is partitioned :)
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10:16 < instagibbs> I'd argue that *you* are partitioned :P
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10:19 < esotericnonsense> moon in the middle attack
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10:40 < instagibbs> while everyone is staring at the sun, scribbled some notes on why HW wallets might need to add an additional protection layer for segwit signing, coinjoin like signing, and possibly other situations: https://0bin.net/paste/EaFkoZUnpiiIa4aA#XJxTw2ldBbe7ykkNT1XH67mOQQfIghhd2wja-KiRKGt
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10:46 < kanzure> instagibbs: you should post that in the partially signed transaction thread on bitcoin-dev.
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11:14 < waxwing> it's interesting, probably needed. introduces another pre-round of interaction before carrying out the join, iiuc.
11:15 < waxwing> need to pass around your sigs of H(A|x) before starting the signing round, right.
11:15 < waxwing> it's like signing before signing; first sign to authenticate, then sign to authorise (payment).
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11:32 < kanzure> instagibbs: ehy not force user to remember previous input sighash...? it should be trusted unchanging data after first pass, ya?
11:32 < kanzure> *why
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11:34 < waxwing> kanzure: i think the attack model here is for the HW wallet not to trust anything, verifies increasing balance in the tx itself.
11:34 < waxwing> hence 'host' etc.
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11:41 < arubi> could you add the fees expected to sighash somehow that can also be validated by the hw wallet?
11:42 < arubi> oh wait, the output still pays, but not to you right?  hm
11:44 < waxwing> i think it has to be implicit that the device verifies outputs ownership, that side shouldn't be a problem right.
11:45 < andytoshi> typically you give bip32 paths to the device for outputs it owns. you can lie to it and say it doesn't own something it does, but not the other way around
11:45 < andytoshi> i think that adding fees to SIGHASH_ALL would've been a strict improvement, thoguh i'm not sure how general the benefit would be, there's a lot of attack surface here to think about
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12:14 < instagibbs> I think general input attribution is needed for the coinjoin case, and possibly others
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12:15 < kanzure> "not to trust anything" well it has to trust the user that the transaction is intended to be signed, right?
12:16 < kanzure> or is this not using the trust root model?
12:17 < arubi> well if I can assert somehow that an input of mine in a transaction will result in an output that pays more than this input's worth, then I won't mind running that in the background :)
12:18 < kanzure> for hardware wallets my personal preference has been to always have a verification step before sending anything to the hardware wallet (e.g. verify the transaction and check the inputs and outputs)
12:20 < arubi> hardware wallets already try to tell you which output is your change with bip32, so if you sign your input amount, fees, and the "change" amount is larger than the input, you can't lose
12:20 < kanzure> "check the inputs" includes things like: look at the prevout transaction; identify the nature of the prevout transaction (why is it in your wallet or what purpose did it serve) (same with each referenced output); check the amounts on the inputs by checking the referenced outputs; check any data that the user included w.r.t amount *expectations* for the transaction to confirm that utxo data ...
12:20 < kanzure> ...from mainnet conforms to the user's expectations; do bip32 derivations for any of the inputs yadda yadda; do bip32 derivations for any of the outputs and report to user the output amounts (including total fee). etc.
12:21 < arubi> oh yea, I was only thinking about coinjoin\joinmarket stuff here.  for some specific payment I do want this control
12:21 < kanzure> joinmarket is defo SIGHASH_ALL ya?
12:21 < arubi> right
12:22 < instagibbs> even in the completely manual case I'd like to know the fees im claiming to sign are actually real, it's additive
12:22 < kanzure> the steps on page 73-75 leave a lot to be desired https://www.bitcoinarmory.com/downloads/glacier-protocol.pdf
12:23 < kanzure> all of that should be automated and standardized. "go to some website and paste" is silly.
12:23 < kanzure> and verifying a signed transaction is fine but the verification steps should have occurred even earlier in the process before applying any signatures at all
12:25 < arubi> oh wow, I should upgrade my scheme..
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12:35 < kanzure> in that pdf they suggest using a quarantined machine for certain procedures (which i agree with) but i disagree that a qr code works for the transfer of all relevant data (qr codes crap out at like 1 kb i thought?)
12:35 < kanzure> so for non-private (and non-secret) data that needs to be sent to a quarantined machne i would suggest either multiple qr codes exchanged by screen or audio transfer
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13:57 < oleganza> If i understand correctly from past conversations, UTXO snapshots are not trustworthy in BTC/Ethereum: for 100% autonomy you need to replay the entire chain from genesis block.
13:57 < oleganza> At the same time, Mimblewimble allows to have the similar compression via cut-through. So every block is effectively a UTXO snapshot and, if i understood gmaxwell's comment a few days back, somehow that snapshot *is* trustworthy (e.g. does not require replay of all transactions from the genesis block). Maybe i've reinterpreted that incorrectly.
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14:01 < oleganza> So, if MW enables utxo snapshots w/o changing the trust assumptions, would it be possible to have that in Bitcoin in plaintext mode? Where range proof is simply a plaintext amount & a signature for the blinding factor? That should be the same overhead as today (no rangeproofs, 1 sig per output, but now associated with an output, not the input).
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14:06 < kanzure> the compact chain sinking signatures stuff?
14:07 < kanzure> from https://download.wpsoftware.net/bitcoin/wizardry/mimblewimble.pdf
14:12 < kanzure> there's a section on this in http://diyhpl.us/wiki/transcripts/scalingbitcoin/milan/mimblewimble/
14:13 < andytoshi> oleganza: in MW you need the utxo snapshot *plus* the kernels (excess values) from every previous block
14:13 < andytoshi> so it's more like you're compressing all the transactions into single signatures, than that you're getting rid of them entirely
14:14 < kanzure> in that sense, yes signature aggregation for bitcoin is a good idea
14:14 < andytoshi> oh i see what you're saying oleganza , to basically do MW + normal bitcoin
14:15 < andytoshi> and no, that doesn't work because once you cut-through scripts you lose the ability to verify them, so you're again weakening the trust model
14:15 < andytoshi> MW really depends on its lack of scripts, so there's no script-based security to be lost
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14:25 < oleganza> andytoshi: got it, that's where i was confused.
14:25 < oleganza> (re: MW really depends on its lack of scripts, so there's no script-based security to be lost)
14:26 < oleganza> thanks!
14:27 < oleganza> so it seems even theoretically there's no way of having UTXO snapshots that are compatible with BTC's security model (even if we can tweak PoW to some compressible PoW)?
14:27 < oleganza> oh, wait. I'm confused again.
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14:28 < oleganza> What i meant above is what if we have opt-in outputs of second sort that do not use scripts at all, but pubkeys. And malleability/cut-through compression applies only to these outputs?
14:28 < oleganza> and lets imagine, 99% of outputs eventually become these new MW-style outputs (sans CT).
14:29 < oleganza> would then the process of "blockchain replay" be more efficient, closer to MW? Or still no?
14:30 < oleganza> kanzure: thanks for the link!
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14:33 < andytoshi> oleganza: yeah, if these were used for entire transactions (all inputs and outputs are these "scriptless ouptuts") you can compress them to just excess values (which wolud be attached to the transactions in the form of OP_RETURN outputs)
14:33 < andytoshi> we had an intern here at blocstream implement a good chunk of this this summer on Elements actually, since we already had CT
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14:34 < oleganza> :-)
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14:41 < oleganza> i guess the big part of petertodd's idea of MMR TXOs being committed from time to time is not only efficiency, but also having enough PoW built on top of a single snapshot, so once can trust it better than just taking an arbitrary tip.
14:42 < andytoshi> yeah, absolutely, and MW gives a way to really amplify that
14:42 < oleganza> s/once/one/
14:46 < oleganza> i wonder if there's ever a case for fully-autonomous bootstrap of a node where we can't simply grab a "universally acceptable" snapshot from a month ago. IMHO, it's similar to how you manually check the software that you download. You compare checksums etc before trusting it. Similarly, you can check that everyone's on chain X having the same snapshot Y from 4000 blocks ago.
14:46 < oleganza> that's not 100% automated (vs. just loading up a genesis block and running from there), but we don't do node upgrades or first-installs in 100% automated manner either...
14:47 < oleganza> (i know, i know, the next logical step is "subjectivity something" and full vitalking towards PoS)
14:47 < kanzure> no next step w/ trust is to skip PoS and go straight to signed blocks
14:47 < oleganza> yup
14:48 < oleganza> but not having decent UTXO snapshots in the face of ever-growing blockchain is a huge PITA while everyone-verified UTXO snapshots with a large grace period is (probably?) very far from PoS/signed blocks in terms of relaxing security assumptions.
14:48 < oleganza> or is it?
14:49 < kanzure> have you kept track of the full node proposals where the user pairs an lite client with their full node?
14:49 < oleganza> have seen something about it. Is there a good summary?
14:50 < oleganza> i'm not saying once cannot run a network of lite nodes off a trusted full node. I'm talking about setting up your own full node from scratch.
14:51 < oleganza> today you can efficiently do it manually by copying bitcoin data folder from a trusted friend and then never be sure if one UTXO was tweaked, so 99% of the time your chain is valid until it isn't.
14:51 < kanzure> no i don't know of a good summary. there's this one but it's related to initial block download not lite clients: https://github.com/bitcoin/bitcoin/pull/9483
14:51 < oleganza> (cont.) if that entire utxo snapshot was verified by the network (assuming extra cost is worth it), you'd be sure your friend did not tweak a single utxo there.
14:52 < oleganza> so it was either full-blown 51% attack (which is our current model anyway), or your utxo set is 100% correct.
14:53 < oleganza> kanzure: thanks, will check it out.
14:54 < kanzure> speaking of utxo commitment things, this was a recent thing http://diyhpl.us/wiki/transcripts/sf-bitcoin-meetup/2017-07-08-bram-cohen-merkle-sets/
14:54 < andytoshi> ignoring the optics of it, there's certainly an argument that if you're downloading a trusted binary of core, you might as well also trust a recent chainstate that they've signed (and better, if there were a process within gitian that downloaded and verified that whole chainstate)
14:55 < oleganza> yup
14:56 < oleganza> and if chainstate is signed/verified by the whole network, and also the software is compiled from sources and verified by whole network, then... then... then it'll be Tezos-level of voodoo (without bad parts)
14:57 < oleganza> but, alas, our compilers require too delicate setting (via VM) to emit deterministic binaries.
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15:03 < andytoshi> heh, well, i'm not suggesting anynthing very elaborate with the "whole network" or whatnot, just "this chain was signed by these people with real names and reputations, who I'm already trusting not to provide me backdoored software anyway"
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17:20 < adlai> optics?
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17:45 < adam3us> someone was arguing the block sat should send signed utxos (even if they are not committed) as an incremental improvement.
17:45 < adam3us> eg multisigned by some threshold of developers.
17:45 < kanzure> for utxo commitments?
17:46 < adam3us> yes given that utxo commitments are not consensus enforced (yet).
17:47 < adam3us> ie really here's a utxo snapshot, trust the signers.
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20:40 < kanzure> file encryption things https://www.cryfs.org/howitworks
20:42 < sipa> a very good question about segwit that i don't know was ever answered completely before: https://bitcoin.stackexchange.com/questions/58414/why-include-the-segregated-witness-merkle-root-in-the-input-field-of-the-coinbas/58415#58415
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20:54 < Emcy> good explainer but it makes it sound like you got lucky having a backwards compatible place to put the segwit commitment?
20:56 < rusty> Emcy: Not really, there were a few options.  The miners didn't like anything which added new restrictions on the coinbase input, IIRC, so it was placed in an output instead.
20:57 < Emcy> i didnt know the coinbase had an input. It just comes out of 'thin air'
20:58 < sipa> the coinbase transaction does have an input, and that input is traditionally even called "the coinbase" :)
20:58 < sipa> it's where the name comes from
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--- Log closed Tue Aug 22 00:00:56 2017