brichard19/BitCrack ? reverse-engineered prompt

Build me a command line tool that searches for Bitcoin private keys on the GPU and reports when it finds a matching address.

I want it to support both CUDA and OpenCL, with separate builds for each, and work on Windows and Linux. It should accept one or more Bitcoin addresses from the command line or from a text file, let me limit the search range with a keyspace option, and let me choose the device and performance settings like blocks, threads, and keys per thread. It should also support compressed and uncompressed address searches, saving and continuing progress, splitting the work into shares, and writing найден private keys to an output file.

Make the default experience simple so I can run it with just an address, but keep the advanced options available for tuning speed and resuming interrupted runs. If you need to, look up current docs for CUDA and OpenCL build setup while implementing it.