🛡️ Smart Contract Security
Smart contracts that hold value are attractive targets. Security means designing for malicious users, reusing audited code, testing thoroughly, and (for serious value) getting professional audits.
Many practices (reentrancy, access control, oracles, signature replay) are explained in an EVM/Solidity context because that’s where most material and tooling exists, but the principles apply across chains.
🎯 Principles
- Assume the contract will hold value — Design for abuse and edge cases.
- Reuse audited code — e.g. OpenZeppelin .
- Test and fuzz — Unit tests, mainnet forking, static analysis.
- Audit for anything holding significant funds.
⚠️ Common Risks
- Reentrancy — External calls before state updates; use checks–effects–interactions.
- Access control — Restrict sensitive functions (owner, roles).
- Oracles — Don’t trust a single price source; use oracles and decentralized feeds where possible.
- Signature replay — Bind signatures to chain, nonce, deadline (e.g. EIP-712 ).
🔗 EVM Deep Dive
For Solidity/EVM-specific patterns, examples, and tooling (Slither, OpenZeppelin):
👉 Smart Contract Security (EVM) — ReentrancyGuard, SafeMath, and more.
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