Solidity Security

Master smart contract security best practices, vulnerability prevention, and secure Solidity development patterns.

When to Use This Skill

• Writing secure smart contracts
• Auditing existing contracts for vulnerabilities
• Implementing secure DeFi protocols
• Preventing reentrancy, overflow, and access control issues
• Optimizing gas usage while maintaining security
• Preparing contracts for professional audits
• Understanding common attack vectors

Detailed patterns and worked examples

Detailed pattern documentation lives in references/details.md. Read that file when the navigation tier above is insufficient.

Testing for Security

// Hardhat test example
const { expect } = require("chai");
const { ethers } = require("hardhat");

describe("Security Tests", function () {
  it("Should prevent reentrancy attack", async function () {
    const [attacker] = await ethers.getSigners();

    const VictimBank = await ethers.getContractFactory("SecureBank");
    const bank = await VictimBank.deploy();

    const Attacker = await ethers.getContractFactory("ReentrancyAttacker");
    const attackerContract = await .(bank.);

    
     bank.({ : ethers..() });

    
     (
      attackerContract.({ : ethers..() }),
    )...();
  });

  (,   () {
      =  ethers.();
     token =  .();

    
     (token.(attacker., ethers..))
      ...;
  });

  (,   () {
     [owner, attacker] =  ethers.();

      =  ethers.();
     contract =  .();

    
     (contract.(attacker).())...(
      ,
    );
  });
});