Show HN: A Reverse Captcha for Clankers

Category: security

Tags: captcha, security, agent-verification, image-processing, proof-of-work

Score: 6.3/10 (Innovation: 7, Technical: 7, Documentation: 6, Utility: 5)

Clanker CAPTCHA is a proof-of-concept reverse CAPTCHA designed to be solvable by automated agents rather than humans, using frequency-domain image puzzles and proof-of-work. It flips the traditional Turing test paradigm by making the challenge intentionally hostile to humans while providing a clear, machine-readable protocol for compliant agents. This project is interesting as an early exploration of agent-facing verification in an era of increasingly capable automated systems.

Target audience: security engineers, backend devs, devops

Repository: https://clanker-captcha.jeromem.workers.dev/

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