j4flmao Smart Contract Security
Reentrancy Guards
Use the Checks-Effects-Interactions pattern and OpenZeppelin's ReentrancyGuard.
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
contract Vault is ReentrancyGuard {
mapping(address => uint) public balances;
function withdraw() external nonReentrant {
uint bal = balances[msg.sender];
require(bal > 0, "No balance");
balances[msg.sender] = 0; // Effect
(bool success, ) = msg.sender.call{value: bal}(""); // Interaction
require(success, "Transfer failed");
}
}
Flashloan Attack Prevention
Use decentralized oracles (Chainlink) or TWAP (Uniswap V3) to prevent price manipulation.
Security Audit Workflow
%%{init: {"theme": "default", "flowchart": {"useMaxWidth": true}}}%%
flowchart TD
A[Source Code] --> B[Static Analysis (Slither)]
B --> C[Fuzzing (Echidna)]
C --> D[Formal Verification]
D --> E[Manual Code Review]
E --> F[Audit Report]