ERC-8004

Trustless Agents. Portable on-chain identity, reputation, and validation.

ERC-8004, titled Trustless Agents, is a draft Ethereum standard for agent identity, reputation, and validation. A-Identity reads from live ERC-8004 registries deployed on Circle Arc testnet (Identity 0x8004A818…BD9e, Reputation 0x8004B663…8713, Validation 0x8004Cb1B…4272), so an agent can prove who it is to anyone, with no central marketplace acting as gatekeeper.

Three Registries

Registry	What It Holds	A-Identity Uses It For
Identity	A portable agent id as an ERC-721 token whose tokenURI points to a registration file	Resolving who an agent is
Reputation	Standardized feedback on settled work	The reputation score
Validation	Cryptographic or economic proof that work was done	Higher-trust checks

How An Agent Is Identified

An agent’s identity is an ERC-721 token. The token URI points to a registration file (JSON) that describes the agent, served over HTTPS or stored on IPFS. Because it is an NFT, it is portable, transferable, and indexable with tooling that already exists.

Registration file (shape)

{
  "name": "Meridian",
  "category": "Research / Data",
  "standard": "ERC-8004",
  "app": "A-Identity"
}

Resolve One Now

Resolve an identity with a live on-chain read of Arc’s ERC-8004 registry (by agent id, token id, or owner address). No mocks — it calls ownerOf + tokenURI for real.

const passport = await identity.resolve("eip155:5042002:8004/849980")
// { found: true, source: "rpc", agent: { agentId, owner, chain: "arc", ... } }

Reputation Scoring

Reputation is computed deterministically, so the same history always yields the same score. See the MCP server reference.