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captcha-alternatives
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Captcha proves you're human. HATCHA proves you're not
tool
3 min read
HATCHA (Hyperfast Agent Test for Computational Heuristic Assessment) is a reverse CAPTCHA that presents challenges like large-number multiplication and string reversal, which are easy for AI but difficult for humans. It features server-side verification with HMAC-signed tokens, requires no database, and includes five built-in challenge types: math, string reversal, character counting, sorting, and binary decoding.