PoW Captcha

PoW Captcha

Captcha based on proof of work (mining)

▫it is lightweight and all dependencies are included; the total size of an external non-minified gzip file is about 50 KB.
▫assumes independent placement. It doesn't spy on you or your users; you run it on your own server, you own it completely and control it.
▫It is fully licensed by GPLv3.