Puzzle 120 solver, definatly very well know about these threads, related developments, bitcrack, kangaroo, vantisearch, keyhunt, bsgs etc,
options are for puzzle 64 and 120, solver never post prvkeys,
maybe puzzle creator ... just for make puzzle live, as no new development, group based attempts by developer, gpu farmers, and individual attempts by useing other develop apps,
reason, puzzle 120 pickup to new address, and no used,
in past every solved puzzle's were cash out by thier solver, for their needs, if they are developer, finder, coder, etc, every one need money, upon they find, they cashout, put puzzle 120 solver too easy, not picked up fork's, and nor cashout, simple transfer to an other address and waiting, what people try new things,
and here threads once asked prvkey, and no more talks, seems every one no more interest, due to silence from solver
Good for us crackers for the puzzle situation to be more discrete and dormant ..business 101: lower competitio equals higher chance of success.
Say if only one cracker is attempting to find puzzle 66, the outcome is he will obviously be the one to solve it.
I'm not sure if it was the puzzle creator who withdrew the money, and i don't vote fot it. Leaving the puzzle to be normally solved by other crackers should be hos goal from the beginning. After all, he wanted to test the security of BTC. Having such small but ranges unsolved for as long as it takes shows him exactly how powerful the Bitcoin hashing and curve are. Solving 120 early would defeat the purpose.