# Signup Abuse Protection Attackers use automated systems, disposable emails, and VPNs to mass-register accounts. Use Cosantoir to seamlessly block them. ## Implementation Strategy 1. Enable the **Email Validation** module to flag disposable and high-risk domains. 2. Enable **IP Intelligence** to flag TOR exit nodes and datacenter VPNs. 3. Enable **Rate Limiting** heavily on /auth/signup to limit bursts. ## Code Example (Next.js) ``ts import { createCosantoir } from '@cosantoir/node'; // Call this inside your server action or API route const verifySignup = async (email: string, ip: string) => { const decision = await client.evaluate({ ip, method: 'POST', path: '/auth/signup', email // Trigger email validation }); return decision.action === 'allow'; }; ``