ENS Best Practices

Authored by:

Ghadi Mhawej

JustaLab

🔑 Key Takeaway: Secure ENS use means fresh L1-backed resolution for funds moves, correct name normalization, and verified bidirectional records—plus interface checks, cointype awareness, and correct CCIP-Read handling.

The Ethereum Name Service (ENS) is a distributed, open, and extensible naming system on Ethereum. It maps human-readable names (for example alice.eth) to machine-readable identifiers such as addresses, content hashes, and metadata. ENS also supports reverse resolution so addresses can advertise a primary name and related metadata.

Mis-implemented ENS flows cause spoofed names, wrong-chain sends, and failed or dangerous resolutions. This framework collects integration practices that reduce those failures.

What this framework covers

1. Data Integrity and Verification: L1 resolution for financial actions and reverse record verification.
2. Cross-Chain Compatibility: cointype (ENSIP-11), CCIP-Read (EIP-3668), reverse records per chain (ENSIP-19 context on the first-party docs).
3. Smart Contract Integration: naming contracts and using ENS as infrastructure.
4. Interface Compliance: EIP-165 supportsInterface before method calls and custom resolver signaling.
5. Name Handling and Normalization: ENSIP-15 normalization and homograph defenses.

Related frameworks

• Front-End / Web App: client surfaces that display and resolve names
• Wallet Security: confirmation UX when resolving to send destinations
• Smart contract external reviews: when contracts embed resolvers
• Infrastructure: RPC and node trust assumptions for resolution
• Secure Software Development: reviews and standards for resolver-using code

Further Reading

• ENS documentation
• ENSIP index
• EIP-3668 (CCIP-Read)
• EIP-165