Re:Graph Isomorphism update: quasipolynomial claim restored
by drdeca on Monday January 09, 2017 @11:45PM
(#13362654)
I don't think bitcoin's work function is based on graph isomorphism?
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Re:Graph Isomorphism update: quasipolynomial claim restored
by xiphias on Tuesday January 10, 2017 @05:41PM
(#13369895)
Yeah, I read more about it, only subgraph isomorphism is known to be NP-complete...of course the complexity of that will remain a mystery for a long time.
Re:Graph Isomorphism update: quasipolynomial claim restored
by wolfgke on Tuesday January 10, 2017 @05:46PM
(#13369940)
And finding a nonce that makes the block have a SHA256 with many leading zeroes is probably not an NP-hard problem.
Re:Graph Isomorphism update: quasipolynomial claim restored
by xiphias on Tuesday January 10, 2017 @06:48PM
(#13370427)
It is, some people also tried SAT solvers for mining:
Re:Graph Isomorphism update: quasipolynomial claim restored
by wolfgke on Tuesday January 10, 2017 @07:46PM
(#13370779)
Please look up the definition of NP-hardness again. If the problem
(#) := "finding a nonce that makes the block have a SHA256 with many leading zeroes"
was NP-hard, it would be an interesting idea to use a solver for (#) to solve e.g. SAT (not the other way round!).
TLDR: You talked about the wrong inclusion.