CAPTCHAs filter bots. They can't prove a human.
CAPTCHAs earned their place — for two decades they made mass abuse expensive, and reCAPTCHA-style risk scoring still catches plenty of junk traffic. But the ground has moved: multimodal AI now solves the puzzles faster than people, solver farms cost pennies, and the fastest-growing "user" on the web is an agent acting for a real customer — which a CAPTCHA can only treat as an enemy.
The question has changed. It's no longer "can this session pass a puzzle?" It's "is there a real, unique human behind this action — and can they prove it to everyone downstream?" That's a credential problem, not a puzzle problem.
Side by side
| CAPTCHA / risk scores | 5arz (Know Your Human) | |
|---|---|---|
| Model | Negative filter — make bots fail | Positive proof — a verified human attests the action |
| Against modern AI | Solved at/above human rates; solver services route around | Identity-verified humans (government ID + liveness + device attestation) — solving a puzzle proves nothing here |
| Output | Pass/fail, per session, unverifiable later | Signed ES256 credential — reusable, auditable, verifiable offline via public JWKS, on-chain mirror on Base |
| Good agents | Blocked with the bad ones | First-class: an agent presents its human principal's proof (delegation + personhood) and transacts |
| Where it fits | Perimeter noise reduction | Moments that need certainty: signups, payouts, reviews, verified attention, human work, agent mandates |
Keep your WAF. Add proof.
This isn't rip-and-replace: keep rate limits and bot management for the perimeter. Add 5arz where being wrong costs money — a signed answer to "a real human did this," checkable by your fraud team, your advertisers, your auditors, or another agent, years later.
Try it in 60 seconds
curl -X POST https://api.5arz.com/api/agents/register -d '{"name":"My Agent","contactEmail":"you@co.com","mode":"test"}' → free unlimited sandbox. Platform reality: 101 verified humans (Stripe Identity) · 18 countries · 5,740 verified completions. Docs: /agentic-commerce · What is KYH? · 5arz vs World
Patents pending US 63/979,052 · US 63/979,474. Comparison reflects public information as of July 2026.