Smart Contract Security: Essential Audit Checklist

Why Smart Contract Security Matters

Smart contracts control billions in assets. A single vulnerability can lead to catastrophic loss of funds. Security isn't optional—it's essential. Before deploying any contract, thorough security audits are critical.

Common Smart Contract Vulnerabilities

Reentrancy Attacks

The most famous attack vector. When calling external contracts, ensure you update state variables before making external calls, or use checks-effects-interactions pattern.

Integer Overflow/Underflow

Use SafeMath library or Solidity 0.8.0+ which includes overflow checks by default. Always validate user inputs and arithmetic operations.

Unchecked External Calls

Always check return values of external calls. A failed call shouldn't silently continue execution.

Front-Running

Transactions are visible in the mempool before execution. Use commit-reveal schemes or batch auctions to prevent attackers from exploiting this.

Security Audit Checklist

• ✓All functions have proper access control
• ✓State changes occur before external calls
• ✓All arithmetic operations are safe from overflow
• ✓External calls have return values checked
• ✓No unchecked delegatecalls to untrusted contracts
• ✓Timestamp dependency issues mitigated