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CapJS is a modern, open-source CAPTCHA solution that employs SHA-256 proof-of-work to verify user authenticity without relying on user tracking or data collection. Designed to be lightweight—just 12kb when minified and compressed—Cap offers seamless integration, full customizability, and supports various modes including invisible and floating displays. It's an ideal alternative to traditional CAPTCHA systems like reCAPTCHA and hCaptcha, providing enhanced privacy and performance.