ERC-8004: Trustless Agents

ERC-8004 proposes a blockchain-based protocol for agents to discover, choose, and interact with one another across organizational boundaries without prior trust. It defines three lightweight registries: an Identity Registry built on ERC-721 that gives each agent a portable identifier resolving to a registration file, a Reputation Registry for posting and fetching feedback signals, and a Validation Registry for requesting and recording independent validator checks. The text says trust models are pluggable and tiered, with security proportional to value at risk, and lists reputation systems, stake-secured re-execution, zkML proofs and TEE oracles as options. It notes that payments are not covered, though examples show how x402 payments can enrich feedback signals.