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08:27 < darosior> I think the Murch-Zawy timestamp attack should be of interest to wizards: https://delvingbitcoin.org/t/zawy-s-alternating-timestamp-attack/1062
08:27 < darosior> See specifically the "Variant on Zawy's attack" section
08:28 < darosior> As i just posted on the consensus cleanup thread at Delving i think a Consensus Cleanup soft fork should include a (trivial) fix for this along with the timewarp fix.
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21:28 < Ademan_> A twitter discussion about OP_PAIRCOMMIT lead to some discussion about emulating functions using merkle proofs and the feasibility of emulating a binary operator with two 32 bit operands. With a single thread, and an unoptimized sha256 implementation I was averaging about 1Mhash/s in C and ~900khash/s in python (presumably python was delegating to an optimized sha256 implementation). With these 
21:29 < Ademan_> numbers, calculating the table for a function with (u32,u32) inputs would take ~500k years (right?) (really x2 to compute the full merkle tree), is this actually infeasible, are my numbers bad, am I just being a bonehead and thinking about this completely wrong? You can obviously do something like decompose a (u32,u32) function into a combination of (u16,u16) in some cases. and computing the 
21:29 < Ademan_> merkle tree for f(u16,u16) is completely feasible. I don't know how many Mhash/s you could squeeze out of a modern graphics card or FPGA, maybe it's feasible with one of those?
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--- Log closed Wed Nov 27 00:00:02 2024