syedsulemanashraf/Hunter ? reverse-engineered prompt

Build me a C++ app that searches for Bitcoin puzzle private keys from a CSV of targets, and only works with mainnet addresses.

I want it to load the puzzle list, validate the addresses at startup, then let me pick a puzzle and how many CPU threads to use. It should search efficiently using real secp256k1, SHA256, RIPEMD160, and Base58Check, show live progress like keys per second, current key, and ETA, and save progress so it can resume if I stop it. If it finds a match, print the address, private key, and WIF, and save the result to a file automatically.

Please include the interactive menu, cross platform build and run scripts for macOS, Linux, and Windows, and make sure it hard fails on any testnet style address. If you need to look up current build or library docs online, go ahead.