ERC-8004

In plain words

ERC-8004 is a draft Ethereum Request for Comments, called "Trustless Agents", for letting AI agents find and trust each other across organisations. It proposes three on-chain registries: identity (who an agent is), reputation (feedback about it) and validation (independent checks of its work). It's still a draft, so details may change.

The validation registry leaves a slot open for exactly the kind of outcome evidence most systems don't have: someone independent confirming the work was done.

How QED Proof uses it

Posting verdicts to ERC-8004 is planned and not built. What exists today is the mapping, written into the receipt spec as informative and provisional until the draft stabilises:

• A receipt can name the agent's ERC-8004 identity (agent.erc8004: chain, registry and agent ID), so a verdict attaches to an on-chain identity rather than a private name.
• When verdicts are published to a validation registry, validationResponse should be verified → 100, late → 50, mismatch → 0 and failed → 0. unverifiable → no response is posted at all, because Couldn't check is never evidence against an agent.
• The evidence URI should resolve to the full receipt, including its proof, so anyone reading the registry can check the verdict themselves.

Example

QED Proof's approach is to plug into standards like this rather than invent a competing identity system. We don't run a marketplace, hold funds or pick winners.