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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<bsm117532>
sipa: with your rolling UTXO set commitment proposal, couldn't proof-of-presence be achieved like this:
<bsm117532>
Given a (R)olling commitment for a block R = A+B+C+... where A, B, C are elliptic curve points as you describe
<bsm117532>
I want to prove if X is in the set {A,B,C,...}
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<bsm117532>
Since additive inverses are possible, the server could just compute R-X. However since computing collisions on this object is hard, a proof could be any two hashes that sum to R-X.
<bsm117532>
In other words, the two values (A+B), (C+...-X) constitute a proof that X is in the commitment R
<bsm117532>
Because of the property that finding Y,Z such that Y+Z = R-X is hard.
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<bsm117532>
Err nevermind. (A+B+2*X) + (C+...-X) = R-X is such a proof. So, this doesn't work.
<bsm117532>
So I return to my previous position -- proof of presence/absence requires imposing an ordering on the set, or removing the additive inverse operation (as in an accumulator).
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<DrakeLuce>
I'm interested in writing my own cryptocurrency, from scratch, without using any existing source code. I've got a good understanding of the language I'm writing it in, so no worries there.
<DrakeLuce>
Just curious if there's any existing good articles on the mechanisms of a scrypt (or sha256) currency, and how they interact
<DrakeLuce>
Like, proof-of-work
<DrakeLuce>
Not looking for a step-by-step tutorial or anything. :)
<DrakeLuce>
(this is for educational purposes, I'm not looking to make a serious altcoin or anything. Just want to more intimately understand cryptocurrencies)
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<andytoshi>
waxwing: so i think your fix to coinswap makes it susceptible to malleability (carol can re-sign the intermediate transaction, invalidating the one that goes to the hash/cltv script)
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<waxwing>
we had some thoughts on it on #25 on that repo. maybe you could add your thoughts there, that'd be appreciated, cheers.
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<andytoshi>
great, thanks, i'll read into it and post my thoughts
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<gmaxwell>
troll-lolo. I'm so tempted to post to reddit "Time to (re)scale Bitcoin: Lets change price tickers to use millibits."
<andytoshi>
waxwing: oh, never mind, i think i'm complaining about the same thing i did in milan (carol resigning tx2), and i'm wrong for the same reason (us using op_cltv/op_csv rather than locktime txes)
<waxwing>
andytoshi: ok, gotcha. it's still an annoyance though, but i think more a practical than a fundamental one.
<waxwing>
in other news, bytecoin is up again today, so this channel is obviously not really needed :)
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