what's Ethereum Attestation Service?

Ethereum Attestation Service (EAS) is an open-source protocol deployed on Ethereum and compatible chains, designed for creating, storing, and verifying attestations—tamper-proof, structured claims about any data, whether on-chain or off-chain. It uses a schema registry where users define custom schemas specifying the format and fields for attestations, enabling standardized, machine-readable statements from individuals or organizations about addresses, events, identities, or other information. Attestations are issued by signing data against a schema via EAS smart contracts, with optional revocation mechanisms and aggregator contracts for efficient multi-attestation storage. Verification checks the schema validity, signature, expiration, and revocation status on-chain, supporting applications like decentralized credentials, reputation systems, KYC proofs, and cross-dApp interoperability without centralized trust.

Ethereum Attestation Service transaction count increased 3,600% by Jan 12, 2026.