I Built a CAPTCHA Killer Using Behavioral Micro-Signals — Here's the Math Behind It

The Problem CAPTCHAs are the worst UX on the internet. And now they don't even work. GPT-4V solves image CAPTCHAs with >99% accuracy. Google's reCAPTCHA is essentially a surveillance tool that tracks users across the web in exchange for "free" bot detection. And the $4.1B CAPTCHA industry has no answer. I decided to build something fundamentally different. The Insight When you interact with a device, your body produces involuntary micro-signals. Your hand trembles slightly (3-12Hz physiological tremor). Your scroll speed varies with attention. Your typing rhythm reflects cognitive load. And critically — these signals are correlated because they share physiological drivers. Your heartbeat creates micro-vibrations in your hand. Your breathing modulates your grip. Your neural oscillations affect your motor planning. This interconnection creates a coherence signature unique to living biological systems. The 5 Signal Channels Pointer Dynamics typescriptfunction pointerJitter(samples: {x: nu