Chapter 2 of 10 · Web3 Security 20%

🔐 280 million dollars of ETH frozen forever by one selfdestruct

November 2017: devops199 called an unprotected initWallet on Parity's library, became its owner, and selfdestructed it. Every Parity multisig that delegatecalled into it died too. Learn the visibility bug class behind it before your next audit. 💣

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Web3 Security

🔐 280 million dollars of ETH frozen forever by one selfdestruct

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Blockchain basics

Solidity security

Reentrancy attacks

Access control flaws

Flash loan attacks

Oracle manipulation

Analysis tools

DeFi attacks

Bridge security

Contract auditing