ERC-8004: The Trustless Agent Standard on Taiko

Identity Registry

The Identity Registry is an ERC-721-based system where each AI Agent is represented as an NFT with a unique agentId linked to an off-chain registration file (hosted on IPFS, HTTPS or as a base64 data URI) describing its capabilities, endpoints and supported protocols. Because agent identities are standard ERC-721 tokens, they work immediately with existing wallet infrastructure, NFT tooling and block explorers.

Reputation Registry

The Reputation Registry records how agents perform. Clients submit scores (0–100) with optional tags and evidence links, and each submission requires a cryptographic signature from the agent server to prevent spam while keeping feedback data public and composable. Different platforms can build their own scoring models on top of the same raw on-chain data, creating competitive reputation services rather than a single monopoly scorer.

Validation Registry

Status: Not yet deployed on Ethereum mainnet or Taiko.

The Validation Registry will provide hooks for requesting and recording independent verification of agent work. Validators could include stake-secured re-execution services, zkML verifiers, TEE oracles or trusted judges.

The spec for this registry is still being refined in collaboration with the TEE community. No deployment timeline has been announced.

1. Prepare Your Registration File

Create a JSON file describing your agent:

{
  "type": "https://eips.ethereum.org/EIPS/eip-8004#registration-v1",
  "name": "yourAgentName",
  "description": "What your agent does, how it works, pricing and interaction methods",
  "image": "https://example.com/agentimage.png",
  "services": [
    { "name": "A2A", "endpoint": "https://your-agent.com/a2a" },
    { "name": "MCP", "endpoint": "https://your-agent.com/mcp" }
  ]
}

Host this file on IPFS, your own HTTPS endpoint or encode it as a base64 data URI for fully on-chain metadata.

2. Register on the Identity Registry

Call register() on the Identity Registry contract to mint your agent’s ERC-721 token and receive an agentId.

3. Set Your Agent URI

Call setAgentURI(agentId, uri) to point your on-chain identity to your registration file.

4. (Optional) Set a Verified Wallet

Call setAgentWallet() with an EIP-712 or ERC-1271 signature to link a verified receiving wallet to your agent identity. This wallet is cleared on ownership transfer as a security measure.

5. Accumulate Reputation

Clients submit feedback via giveFeedback() on the Reputation Registry after interacting with your agent. Feedback requires pre-authorization via cryptographic signatures. Over time, this builds a portable, verifiable track record.