@kainoa @NGIZero @weirdwriter @philsherry
Not blockchain based, but it uses a mechanism where it becomes increasingly more expensive to do automated actions. It is called PoW, as it works similarly.
But the intricate details are best eplained by the developer.
I dunno current status, but #mCaptcha is being considered for inclusion in #Forgejo and #Gitea and will then also be available in #Codeberg as the #captcha solution.
https://codeberg.org/Codeberg/Community/issues/479#issuecomment-581973