Contracts (EAS) | Optimism Docs

https://docs.optimism.io/chain/identity/contracts-eas

This guide covers Ethereum Attestation Service ("EAS") (opens in a new tab), an open-source public good that is included as a predeploy in the OP Stack. It also covers EAS contract addresses, how to read and write attestations, and indexing.

EAS Contract Addresses

The Ethereum Attestation Service (opens in a new tab) is deployed on these addresses:

How to Read and Write Attestations

You can read and write attestations in several ways:

• EAS scan user interface (OP Mainnet) (opens in a new tab)
• EAS scan user interface (OP Sepolia) (opens in a new tab)
• JavaScript SDK (opens in a new tab)
• Access directly onchain (opens in a new tab) (if you need to attest from a smart contract)

Indexing

Indexing is available via:

• GraphQL endpoint (opens in a new tab)
• Ponder graph (opens in a new tab)
• Open source indexer (opens in a new tab)

Next Steps

For more information on working with attestations, see Build Decentralized Identity Apps with Attestations.