#bitcoin-wizards on 2019-10-02 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 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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09:03 <Jmabsd> not one bitcoin block last 40 minutes?

09:03 <Jmabsd> 120-50min ago had even 10 minute intervals, now not one in 50min.

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10:07 <waxwing> Jmabsd, #bitcoin please

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10:12 <Jmabsd> waxwing: how do you differentiate queries between #bitcoin and here

10:13 <waxwing> Jmabsd, see the topic. discussion of theoretical ideas, not of current bitcoin.

10:13 <Jmabsd> ah ic

10:13 <Jmabsd> waxwing: had missed it, thanks for pointing out.

10:13 <waxwing> the main reason it matters is only because people keep logs of this and if it's full of stuff that's just general bitcoin it'll be hard to find the material that's relevant.

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14:34 <elichai2> Current bitcoin multisig tolerates up to n-k malicious parties, right? (in a k of n scheme)

14:35 <elichai2> i.e. if you have 3 of 5, then if up to 2 parties did something malicious(i.e. giving a bad key) you can still recover the funds, but if more then n-k do then you're sutck

14:35 <elichai2> *stuck

14:36 <instagibbs> giving a bad key, meaning they cannot sign for themselves?

14:36 <instagibbs> that's an attack i guess, but yeah

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14:42 <sarang> Isn't the assumption of `k` available parties implicit in all threshold constructions?

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14:46 <sipa> elichai2: you can have policies like 3-of-5 that degrade into 2-of-5 after some time, for example

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14:51 <elichai2> sipa: aren't you in vacation? lol

14:52 <elichai2> instagibbs: yeah. in a threshold scheme you might not trust everyone involved, even for them to give valid keys

14:59 <instagibbs> elichai2, you were asking about current bitcoin multisig, but perhaps I don't know what you're actually asking

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15:02 <elichai2> current bitcoin multisig is also a threshold scheme. where everyone gives their public keys and agree on a threshold

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15:06 <sipa> elichai2: oops, right

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15:59 <pinheadmz> in message signing, why do we offset the recid by a value of 27 ? Is there a reason that number was selected?

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17:32 <nsh> pinheadmz, "Frankly, I just picked a range of numbers whose binary representation wouldn't easily collide with those of addresses (0, 111), secret keys (128, 239), public keys (2-7) or signatures (48). At the time, I didn't really expect it to end up in the message signing feature eventually." -- https://bitcoin.stackexchange.com/questions/5082/why-do-compact-signatures-need-to-start-with-a-byte-27-35

17:32 <nsh> oh no, that's another matter

17:32 <nsh> cf. https://bitcoin.stackexchange.com/questions/38351/ecdsa-v-r-s-what-is-v

17:36 <pinheadmz> nsh: yeah "I'll try to write a full answer later." -- was hoping to dig something up

17:37 <pinheadmz> avoiding collision with other prefixes makes sense, ty

17:42 <nsh> i think it might be standard part of pubkey recovery for secp256k1

17:43 <nsh> but as sipa says in the link above, you can also use 28,29,30 and get different points/keys

17:43 <nsh> so i guess it relates to the arithmetic

17:44 <nsh> 27 is the coefficient of b^2 in the Weierstrass form of the curve, which may not be a coincidence

17:45 <nsh> or rather a, b ∈ Fp satisfy 4a^3 + 27b^2 mod p is not 0

17:45 <nsh> which is maybe more coincidental seeming.

17:45 <nsh> in short, i have no idea :)

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17:56 <nsh> (27 is a magic number for cubic surfaces in general)

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18:10 <nsh> .t https://twitter.com/johncarlosbaez/status/1029555779152408581

18:10 <EmmyNoether> This image by Greg Egan illustrates the amazing "Cayley–Salmon theorem": any smooth complex cubic surface contains 27 straight lines! // In this example all the lines lie in real 3-dimensional space, not just complex 3d space. // (continued) https://video.twimg.com/tweet_video/Dkm2_VLVAAAt_IV.mp4 (@johncarlosbaez)

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20:59 <tochka4_> Hello. Here is a link for a draft of a BIP for compact probabilistic block

20:59 <tochka4_> filters alternative of BIP 158

20:59 <tochka4_> https://github.com/bitaps-com/bips/blob/master/bip-block-batch-filters.mediawiki

20:59 <tochka4_> https://github.com/bitaps-com/bips/blob/master/bip-mempool-transactions-filters.mediawiki

20:59 <tochka4_> please take a look

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