Internship← Blockchain & Smart Contracts (Solidity) learning pathBlockchain & Smart Contracts (Solidity) · Module 8 of 10
Smart contract security
Avoid costly vulnerabilities.
📖 Key ideas
- Follow checks-effects-interactions to prevent reentrancy.
- Use access control (Ownable, AccessControl) correctly.
- Validate inputs and handle external calls carefully.
- Beware front-running and oracle manipulation risks.
- Get audits; use tools like Slither and Mythril.
💡 Real-life example: Contract security is building a bank vault in public: everyone can study the lock, so it must be perfect.
ReentrancyRepeated re-entry during an external call
Checks-effects-interactionsSafe ordering pattern
Access controlRestricting who can call functions
AuditExpert security review