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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<instagibbs_>
I found Vertcoin, which also had a PoW attack, unrelated in the same year
<instagibbs_>
pinheadmz, that's it
<pinheadmz>
they have like 8 PoWs
<pinheadmz>
proof of orgy
<instagibbs_>
elichai2, so there you go, but that's probably not what you meant. You probably meant something like Vertcoin, which has 8 chained hashes...
<elichai2>
instagibbs_: yes
<elichai2>
the question is did they find any advantage or just brute forced?
<instagibbs_>
Is there any papers about that in general? I know people do it in other contexts, f.e., password hashes in db
<gleb>
elichai2: Does it feel difficult to design multi-PoW well in terms of crypto properties? I understand nothing is impossible after what IOTA done to hashing, but still. I would expect it be much more flawed in terms of the cryptoeconomics (asics and pools and all that), while cryptographic part can probably be done right.
<elichai2>
I hear people think that finding collisions/advantages in `H_1(H_2(H_3(INPUT)))` is as hard as breaking all of them. but Dan Boneh proved this is *impossible* (impossible to construct an H which is as hard of all the underlying functions)
<instagibbs_>
ok so my gut instinct is "no" there have been no practical attacks on altcoins, because if there were they'd be on cryptographers' triumphant slides
<elichai2>
gleb: well practice show he's FAQ isn't exactly correct. there one very good reason to tweak the PoW algorithm
<elichai2>
making ASICS for coin X not work for coin Y
<elichai2>
instagibbs_: yeah that's what I think, the fact that the only paper i've found is from 2006 seems like no one really cares / think it's worth the effort
<instagibbs_>
long tail altcoins are just cheaper to attack the good ol' fashioned way
<elichai2>
yep
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