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Sorry about the docker-only config example. It also supports a json file for config. You just need to be able to compile the go code for OpenBSD; that shouldn't be too hard.
I bet Anubis might be easier to use for now as its more popular and mine is more of a work-in-progress / hack. I made my own because I wanted this as a "captcha" before LLMs and Anubis existed, and also because I wanted to use a memory-hard hash function like Scrypt or Argon because I figured that would inflict a lot more pain on bots in the situation where the bot operators eventually decided to bite the bullet and just solve the PoW challenge.
@davepolaschek @joel
Er, sorry, to clarify, what I meant was that docker is not required; it's just the main config example I have right now. the JSON equivalent is:
https://git.sequentialread.com/forest/pow-bot-deterrent-rp/src/branch/main/config.json.example
altho it may be out of date w/ the latest changes.