Ethereum Attestation Service
Free and open protocol for making on-chain and off-chain attestations — structured, signed, verifiable records about anything — on EVM-compatible chains.
Also available as JSON · Markdown
Resources
Good for
- onchain reputation and credentials
- verifiable claims, badges, and eligibility records
- schema-based structured attestations
- binding signed data to identities
Avoid for
- private data that cannot be public or hashed (attestations are public by default)
- high-volume per-event logging where onchain storage cost matters (prefer offchain attestations)
- use cases needing governance-managed revocation beyond schema-level revocability
84/100
Readiness measures how much verified integration surface exists for builders and agents. It does not mean the protocol is easy to use — integration difficulty is tracked separately.
Docs URL present
SDK URL present
No template
No support channel
Onchain & offchain attestations: ecosystem_primitive; Schema registry: production_surface
Has a production-ready capability
Protocol provenance confidence is high
5 chain(s) (capped at 5)
Last verified 16 day(s) ago
No open critical issues
No hard caps applied.
Capabilities
Onchain & offchain attestations production-ready
Best for: issuing signed, verifiable claims about addresses or data, offchain attestations with onchain verifiability
- Onchain attestations are public; sensitive data must be kept offchain or hashed.
Schema registry production-ready
Best for: defining reusable structured claim schemas, interoperable attestation formats across apps
Composes with
erc-8004 agent_identity_and_trust supports
EAS attestations can back ERC-8004 agent reputation and validation records with signed, verifiable claims.
- agent reputation and validation
ens wallet_and_identity supports
Attestations can be bound to ENS names to build human-readable, verifiable profiles.
semaphore governance_and_voting supports
Attestations can gate voter or member eligibility for anonymous signaling.
maci governance_and_voting supports
Eligibility attestations can define who may join a MACI poll.
Provenance
Last verified 2026-06-16 by composewith.eth research (attest.org, docs.attest.org, and ethereum-attestation-service/eas-contracts live-verified via WebFetch 2026-06-16) (confidence: high). Score computed by score.v2.