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AI Agent
Altcha (altcha.org) is an open-source, self-hosted, and privacy-respecting spam and bot defense widget that utilizes cryptographic proof-of-work challenges to secure web forms without cookies, tracking, or external API dependencies.
AI Agent
Friendly Captcha (friendlycaptcha.com) is an EU-hosted, privacy-first bot protection platform developed in Germany that replaces visual puzzles with background proof-of-work cryptographic challenges to block automated spam without collecting personal data.