https://github.com/futuremoneybtc/PuzzleFinder

Fully enhanced with zero bugs.. benchmarks ??

>.\PuzzleFinder.exe  -sbl 19 -ebl 20 -p 4 -t 1 -i .\addresses.txt
>

> .\PuzzleFinder.exe
All options -t, -i, -sbl, -ebl, and -p are required!
  -t   <threads>          : Number of CPU threads (1 to max available)
  -i   <input_file.txt>   : Path to file of Base58 Bitcoin addresses
  -sbl <start_bit_length> : Starting bit length (e.g., 67)
  -ebl <end_bit_length>   : Ending bit length (e.g., 160)
  -p   <prefix_length>    : Length of prefix to match (1-20)


>.\PuzzleFinder.exe  -sbl 40 -ebl 41 -p 4 -t 1 -i .\addresses.txt
>