Contract Security Best Practices
Discover essential security practices for smart contract development, including reentrancy guards, checks-effects-interactions pattern, and access control.
Smart Contract Security Intro
Welcome to the critical world of smart contract security! Unlike traditional software, bugs in smart contracts can lead to irreversible loss of funds.
Because smart contracts are immutable once deployed, fixing vulnerabilities is extremely difficult, often requiring complex upgrade mechanisms or even redeploying a new contract.
In this lesson, we'll explore essential practices to build more secure and robust smart contracts.
Understanding Reentrancy
One of the most infamous vulnerabilities is reentrancy. It occurs when an external call to another contract or address "re-enters" the calling contract before the initial function's state updates are complete.
Imagine a bank ATM that lets you withdraw money. If it debits your account *after* giving you cash, a reentrancy attack would be like repeatedly asking for cash before the system updates your balance, draining the ATM.
All lessons in this course
- ERC Standards (ERC-20, ERC-721)
- Contract Security Best Practices
- Upgradeable Contracts