sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja
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<wallet42> what would be a theoretical size/weight of a 2 ins 2 outs transaction that uses a hypothetical v1_segwit schnorr signature scheme? inputs spend/outputs created are both schnorr scripts
<aj> wallet42: probably a few bytes smaller than a v0_segwit tx (due to using a custom encoding rather than DER) ? i don't think an encoding has been proposed yet though
<wallet42> well i read something like schnorr can do public key recovery?
<wallet42> so you d need only 1 element on the witness data stack (the actual signature)
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<wallet42> and the public key hash on the output side
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<aj> wallet42: can't you do that with ecdsa too?
<wallet42> well checksigverify doesn't do it
<aj> wallet42: yeah, it's slow i think.
<wallet42> but saving another 33-35 bytes is huge imo
<aj> wallet42: signature aggregation changes things though; i think you'd have a single 80-byte sig for the block, and just the 32-bytes for each txin pubkey
<wallet42> :-O
<aj> wallet42: (with sigagg you need the pubkeys as i understand it)
<wallet42> in that case im happy to do that trade :)
<aj> hmm, signature aggregation means you can't do a small SPV proof of bad signatures?
<wallet42> merkle tree hash of unagregated sigs?
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<aj> ah, hmm, apparently current proposals only merge sigs within a transaction, not a block (and encourage coinjoin-like usage for users to merge transactions themselves)
<wallet42> where to read more?
<aj> so i think that would make the 2-of-2 drop an 80 byte sig, but keep the two 32 byte pubkeys and one of the 80 byte sigs (plus a byte or two of accounting)
<wallet42> (y)
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<adiabat> there *is* a proposal to do block-wide signatiure aggregation
<adiabat> it's ... got issues though :/
<adiabat> the way it would work size-wise is that every signature in the block would be cut in half, into 2 32-byte parts
<adiabat> one 32-byte part would remain, and the other 32-byte part of every signature would be combined and committed to in the coinbase tx by the miner
<andytoshi> aj: sigs are 64 bytes. with signature aggregation they can all be reduced to 32 bytes with an additional 32-byte aggregate
<adiabat> it works mathematically; the problem is caching
<andytoshi> right, what adiabat said also applies to the interactive scheme
<adiabat> with interactive & schnorr (or BN signatures I think) the whole thing turns in to 64 bytes
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<andytoshi> no, that's true for multisignatures but not for aggregation (which works with multiple messages that have distinct pubkeys)
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<adiabat> I'm not clear on the different terms here
<adiabat> for bitcoin's use case, an interactive siganture aggregation within one transaction would have one signauture for the whole tx
<adiabat> so yeah they're all signing the same message
<adiabat> with a bunch of different pubkeys
<andytoshi> no
<adiabat> that can all go into 64 bytes
<andytoshi> that is not signature aggregation
<adiabat> ok what do you call that?
<andytoshi> i would call that a multisignature
<adiabat> and signature aggregation is for multiple messages?
<andytoshi> it supports multiple messages, yes, but it's also for separate pubkeys that aren't assumed to have been chosen non-maliciously
<andytoshi> doing a multisig like you describe requires more interaction and is much harder to do securely if there are malicious signers
<adiabat> multisignature also works with pubkeys that aren't known beforehand
<andytoshi> not securely it doesn't
<adiabat> hm... I may again be using different terms but
<adiabat> which is what people are basing the the multisignature work for bitcoin on
<andytoshi> adiabat: yes, that is signature aggregation
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<andytoshi> adiabat: yes, i am one of those "people", i wrote the first implementation of signature aggregation
<andytoshi> the authors use the term "multisignature" for what we are terming "signature aggregation" because we're using it to aggregate what would otherwise be separate signatures
<adiabat> ok wait ... signature aggrregation = multiple messages, multiple pubkeys
<andytoshi> yes
<adiabat> multisignature = 1 message, multiple pubkeys
<andytoshi> i use that term to mean 1 message, 1 pubkey (well, from the verifier's perspective)
<adiabat> ohhhh
<adiabat> OK I think sipa was using the term "key aggregation" for that
<andytoshi> ah, yeah, that's right
<adiabat> though acutally I don't think people were clear on what to call it :)
<andytoshi> i think "multisignature" we'll probably just have to taboo
<adiabat> yeah we should write up what the different scenarios are and the right terms for them
<andytoshi> yeah, i know..
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<Beginer> fuck all
<Beginer> https://blockchain.info/payment_request?address=3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r&message=Please+a+need+this+money,+every+day+is+very+difficult+to+me.+Please+help-me+a+need+to+give+money+for+my+family.+I+do+anything+for+this+%0A&amount=1
<Beginer> https://blockchain.info/payment_request?address=3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9r&message=Please+a+need+this+money,+every+day+is+very+difficult+to+me.+Please+help-me+a+need+to+give+money+for+my+family.+I+do+anything+for+this+%0A&amount=1
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
<Beginer> please
<Beginer> 3JfyCAuEskY8zWwBHM8HVUfp8UGLfdzKX6
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<newbie> hm
<newbie> please..
<newbie> stop spamming
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* adlai is reminded of the one about the young student who approaches professor before exam, alone, at night; pledges to do anything, anything at all, just to pass the exam; quoth the prof: "Would you... study?"
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<fluffypony> hey the beggers are using multisig
<fluffypony> it's a new world!
<sipa> ?
<fluffypony> sipa: the spam from "Beginer" earlier
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<belcher> could just be segwit
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<asaaq13> hi
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* charutocafe[m] sent a long message: charutocafe[m]_2017-08-29_23:48:20.txt <https://matrix.org/_matrix/media/v1/download/matrix.org/tNRpqibOlxlqxXgMuZHQqApm>
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