What Is EAS (Ethereum Attestation Service)?

EAS, the Ethereum Attestation Service, is an open, free-to-use protocol for making structured, verifiable claims -- "attestations" -- either on the Ethereum blockchain or off-chain. It isn't specific to AI models; it's general-purpose infrastructure used for things like credentials, identity verification, reputation systems, and audit trails.

How it works, briefly

Anyone can register a schema on EAS -- a definition of what fields a particular type of attestation will contain (for example, a model name, a hash, an issuer, a claimed date). Once a schema exists, anyone can submit an attestation against it: a specific, filled-in instance of that schema, cryptographically signed and recorded. Attestations can optionally be made non-revocable, meaning once submitted, they can never be withdrawn or altered by anyone -- not even the account that created them.

Every attestation is publicly queryable through EAS's own explorer and GraphQL API, independent of whatever application originally submitted it.

How Weight Registry uses it

Weight Registry registered its own schema on EAS defining the fields relevant to a model weights release: combined cryptographic hashes (SHA-256, SHA3-256, BLAKE3), a file manifest, model name, issuer, source URL, claimed knowledge cutoff, and a description. Every attestation submitted under that schema is set to non-revocable, so once a model's hash is recorded, it's permanent.

Weight Registry currently runs on Ethereum's public Sepolia testnet during this project's build-out; the underlying attestation mechanics are identical to what would run on Ethereum mainnet.

You can view any of Weight Registry's attestations directly on EAS's own explorer -- no account or relationship with Weight Registry required to check them.