syedsulemanashraf/solver ? reverse-engineered prompt

Build me a Bitcoin puzzle solver in C++ that can search for private keys much faster than a simple brute force approach.

I want a command line tool that can work on different puzzle sizes, let me choose the puzzle number, pick between random search, sequential search, and a much faster BSGS style search, and set how many CPU threads to use. If possible, add GPU support too, with a simple flag to turn it on. It should save any found key details to a file, and print clear progress and status while it runs.

Make it easy to build with CMake, and keep the project organized so it’s practical to compile and run on a normal machine. If you need to look up current docs for any crypto or GPU libraries, go ahead and do that.