Ethereum Attestation Service (EAS): Building Trust in a Decentralized World

The Ethereum Attestation Service (EAS) is presented as a framework for digital attestations, which are simple digital signatures that confirm the validity of claims or transactions, to reduce reliance on centralized trust authorities. The article describes two core smart contracts, SchemaRegistry.sol, which registers data schemas, and EAS.sol, which creates attestations based on those schemas, with resolver contracts able to add custom conditions such as payments. It says attestations can be on-chain, offering immutability at the cost of Ethereum gas fees, or off-chain, for example on IPFS, offering greater privacy. Use cases named include identity verification, voting, and land registry ownership checks.