ZeroDay Dev

Learn to break things — before attackers do.

ZeroDay Dev teaches secure coding and blockchain security through 1,000+ hands-on challenges. Learn from 30+ real-world exploits: Beanstalk, Indexed Finance, bZx, VeilCash, Sigma.Money, Bybit, and more. Each exploit is linked to verified incident records so you learn from actual on-chain events, not hypotheticals.

WHAT YOU'LL LEARN
• Exploits — Reentrancy, oracle manipulation, flash loans, proxy races
• Solidity — Proxies, storage collisions, OpenZeppelin, core security
• Rust — Ownership, borrowing, error handling, async
• DeFi — AMMs, lending, oracles, vaults
• Solana — Account model, security, Anchor
• Cybersecurity — Web security, HTTP smuggling, OWASP

HOW IT WORKS
• Practice — Tap, drag, or select. Quick feedback, no docs required.
• Exam — Timed tests across domains with performance tracking.
• Lightning Round — Sprint mode with interactive-only questions.
• Streaks & XP — Daily streaks, badges, and progression keep you consistent.

BUILT FOR DEVELOPERS
• Offline-first — Learn on the subway, no Wi‑Fi needed.
• No account required — Start immediately.
• 30+ real-world exploits — Beanstalk, Indexed, bZx, VeilCash, Bybit & more.

A zero-day is a vulnerability unknown to the vendor — they have zero days to patch it. We teach you to find and fix them before attackers do.