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Probably not really suitable for Cloudflare scale, but for others who are forced to use CAPTCHA, consider https://hashcash.io/ https://hashcash.io/ for easy Pro

by hippich 11y ago

Probably not really suitable for Cloudflare scale, but for others who are forced to use CAPTCHA, consider https://hashcash.io/ https://hashcash.io/ for easy Proof-of-Work integration.