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ERC-8004 Integration

ERC-8004 is an Ethereum standard for registering, identifying, and giving feedback on internet services on-chain. It specifies an Identity Registry for tokenizing AI agents as ERC-721 NFTs. Each token represents a verifiable identity for an agent or agent API. ERC-8004 also specifies a Reputation Registry for feedback.

How ERC-8004 Relates to OMATrust​

OMATrust interfaces with ERC-8004 in two ways:

  • The OMATrust App Registry, which will be documented later, is an ERC-8004 Identity Registry with additional extensions. The App Registry is currently undergoing audit planning.
  • OMATrust's reputation layer extends ERC-8004 with attestations (user reviews, security assessments, endorsements, certifications) that leverage Ethereum Attestation Service. These attestations provide additional trust signals to the agent economy.

ERC-8004 EAS Extension​

Three extensions are being developed to expand ERC-8004's capabilities. The first is currently under review as a pull request on the ERC-8004 repository. It defines how to map ERC-8004 to Ethereum Attestation Service (EAS) for attestation indexing:

  • DID Address — A 20-byte value derived from truncating keccak256(canonicalDID), used as the EAS recipient field for efficient querying. ERC-8004 agentURI identities can be expressed as a DID using the did:web method.
  • Schema design — OMATrust attestation schemas utilize both recipient (DID Address for indexing) and subject (full DID string) for verification.

Further Reading​