Please tell me that you are joking. You will be spending more money on GPUS than the reward you could potential get.
No, i'm not joking. My company that i work in has currenly free GPUs for free renting. That's what i thought. I thought of solving puzzle 64 to 69 with the help of free GPUs.
you need 2724 2080ti approximately to do puzzle 64 in one month with bitcrack. 1362 if you correctly guess which half of the range it is in.
or in other words 1,830,035 optimal 2080ti hours for $24,000. mine is a founder edition and can hit 1,400,000,000 Mk/s with -b 4532 -t 32 -p 584.
puzzle 66 is 4 times larger than 64
puzzle 67 is 8 times larger than 64
puzzle 68 is 16 times larger than 64
puzzle 69 is 32 times larger than 64
puzzle 120 with the Kangaroo method is approximately the same difficulty and would yield ~$50,000.
puzzle 125 is 10x puzzle 120
so in 2 months 2724 2080tis would get you ~$75,000.