{
  "title": "ERC-8004 trustless agents: identity & reputation explained",
  "summary": "ERC-8004 is a Draft Ethereum standard giving AI agents portable on-chain identity, reputation, and validation across three registries. It extends A2A/MCP with a trust layer so agents can interact without prior trust.",
  "faqs": [
    {
      "q": "What is ERC-8004?",
      "a": "ERC-8004, titled \"Trustless Agents,\" is an Ethereum standard that defines a trust layer for autonomous AI agents through three on-chain registries for identity, reputation, and validation. It lets agents discover, choose, and interact with each other across organizational boundaries without pre-existing trust. It was developed with contributors from organizations including the Ethereum Foundation, MetaMask, Google, and Coinbase."
    },
    {
      "q": "What are the three registries in ERC-8004?",
      "a": "The Identity Registry assigns each agent a portable, censorship-resistant identifier built on ERC-721. The Reputation Registry provides a standard interface for submitting and retrieving feedback signals with optional tags. The Validation Registry lets agents request independent verification of their work, supporting mechanisms such as stake-secured re-execution, zkML proofs, or TEE oracles."
    },
    {
      "q": "How does ERC-8004 relate to MCP and A2A?",
      "a": "It complements them. MCP lets servers list and offer tool capabilities, and A2A handles agent authentication, skill advertisement via Agent Cards, messaging, and task lifecycle. Neither inherently covers cross-organizational agent discovery and trust, which ERC-8004 adds via its registries; it even reuses A2A's tasks and skills nomenclature in its feedback structure."
    },
    {
      "q": "Is ERC-8004 finalized and widely adopted?",
      "a": "Not yet. As of mid-2026 the EIP is in Draft status, so interfaces may still change. Identity and Reputation registry contracts have been reported as audited and deployed to Ethereum mainnet and additional networks, while the Validation Registry is still under active revision. Adoption is early, and reputation data should be treated cautiously until usage volume grows."
    },
    {
      "q": "Should I build on ERC-8004 now?",
      "a": "It can make sense to register identity early if you operate public agents and to follow the reference contracts, but because the standard is Draft you should expect interface changes and avoid over-relying on reputation scores while the network is sparse. Keep payment and discovery decisions decoupled so you are not locked to a single chain standard prematurely."
    }
  ],
  "key_points": [
    "ERC-8004 (\"Trustless Agents\") is an Ethereum standard for agent identity, reputation, and validation; it was in Draft EIP status as of mid-2026",
    "Three registries: Identity (portable ERC-721 identifier), Reputation (standardized feedback signals), Validation (independent verification of work)",
    "Validation supports stake-secured re-execution, zkML proofs, or TEE oracles",
    "It extends — does not replace — MCP (agent-to-tools) and A2A (agent-to-agent), adding a cross-org trust layer they lack",
    "Identity & Reputation contracts are reported deployed to Ethereum mainnet and additional networks; Validation Registry is still being revised",
    "Because it is Draft and adoption is early, treat reputation data cautiously until network effects are real"
  ],
  "body_paragraphs": [
    "ERC-8004, titled \"Trustless Agents,\" is an Ethereum standard that defines a trust layer for autonomous AI agents based on identity, reputation, and validation. It was developed by contributors associated with organizations including the Ethereum Foundation, MetaMask, Google, and Coinbase. As of mid-2026 the proposal is in Draft status in the EIP process — meaning the interfaces are stabilizing but the standard is not yet finalized. Anyone reading adoption claims should keep that Draft status in mind; figures about deployments come from the project and its community rather than an independent census.",
    "The standard is built around three on-chain registries. The Identity Registry gives each agent a portable, censorship-resistant identifier built on ERC-721 (with URIStorage), combining namespace, chain ID, and contract address into a globally unique designation. The Reputation Registry provides a standard interface for submitting and retrieving feedback signals — fixed-point values with optional tags — supporting both on-chain and off-chain reputation aggregation. The Validation Registry lets an agent request independent verification of its work and lets validators record responses, supporting mechanisms such as stake-secured re-execution, zkML proofs, or TEE (trusted execution environment) oracles.",
    "ERC-8004 is explicitly positioned as a complement to existing agent protocols rather than a replacement. The proposal notes that MCP lets servers list and offer capabilities, and that A2A (Agent-to-Agent) handles agent authentication, skill advertisement via Agent Cards, messaging, and task lifecycle — but that neither inherently covers cross-organizational discovery and trust. ERC-8004 fills that gap, and even reuses A2A nomenclature (tasks and skills) inside its feedback structure. In effect: MCP connects an agent to tools, A2A connects agents to each other, and ERC-8004 adds a portable, verifiable identity-and-reputation layer underneath both.",
    "What is the realistic 2026 picture? Identity and Reputation registry contracts have been reported as audited and deployed to Ethereum mainnet and additional networks, while the Validation Registry is described as still under active revision (notably with the TEE community). Because the EIP is Draft, teams building on it should expect interface changes and treat reputation data with the same skepticism they would apply to any new, sparsely-populated trust system — on-chain feedback is only as meaningful as the volume and honesty of the agents producing it. For builders, the pragmatic move is to follow the reference contracts and the awesome-erc8004 resource list, register identity early if you operate public agents, and avoid over-relying on reputation scores until the network effect is real. SaSame, an AI-native studio building MCP servers and agents, tracks ERC-8004 as the emerging identity substrate for agent-to-agent commerce while keeping payment and discovery decoupled from any single chain standard."
  ],
  "sources": [
    "eips.ethereum.org/EIPS/eip-8004",
    "ethereum-magicians.org/t/erc-8004-trustless-agents/25098",
    "allium.so/blog onchain-ai-identity what-erc-8004-unlocks",
    "eco.com/support what-is-erc-8004 trustless-ai-agents",
    "blog.quicknode.com/erc-8004-a-developers-guide-to-trustless-ai-agent-identity",
    "github.com/sudeepb02/awesome-erc8004"
  ],
  "slug": "erc-8004-agent-identity-reputation-2026-06-17",
  "author": "SaSame",
  "generated_at": "2026-06-17T17:10:00.000Z",
  "published_at": "2026-06-17T17:10:00.000Z",
  "generator": "sasame-aeo-wave4"
}