Re: Bitcoin puzzle transaction ~32 BTC prize to who solves it
By the way, your version of mutagen (which you updated not so long ago) has become faster to check, before 300 billion took 12 hours, and now 8 hours. Cut another 6 hours and it will be like in Cyclone 
Code:
for (int pos : flips) {
Int mask;
mask.SetInt32(1);
mask.ShiftL(pos);
currentKey.Xor(&mask);
}
Int mask;
mask.SetInt32(1);
mask.ShiftL(pos);
currentKey.Xor(&mask);
}
Yes, this is the maximum. Only if you program XOR to work in assembly might it be faster. The same applies to the combination generator - they are a bottleneck
https://github.com/NoMachine1/Mutagen/commit/ffcddcbcdbf2c4bba12b0439d61a403a08f22d3b
=======================================
=========== SOLUTION FOUND ============
=======================================
Private key: 0x1A96CA8D8
Checked 714563971 combinations
Bit flips: 15
Time: 50.04 seconds (00:00:50)
Speed: 42.27 Mkeys/s
Solution saved to puzzle_33_solution.txt