ERC-8263 Specification — TruthAnchor
ERC-8263: Onchain Proof Layer for AI Agent Actions. Open standard authored by Vincent Wu. Reference implementation verified on Ethereum Mainnet at 0xe95d6a15966984c209a62a2c188828555eb5ec3d. Product anchoring on Polygon, Base, BNB Smart Chain mainnets plus Sepolia testnet.
Standard Overview
ERC-8263 defines a minimal on-chain interface for anchoring AI agent action proofs. Every action — input, decision, source, output — gets a SHA-256 hash anchored to a public blockchain. Only the hash is stored on-chain. Original data stays private. Anyone can verify a proof against the chain without permission.
Reference Contract
The ERC-8263 reference implementation is deployed and Etherscan-verified at 0xe95d6a15966984c209a62a2c188828555eb5ec3d on Ethereum Mainnet (Exact Match, compiler v0.8.19, MIT, no optimizer). Source: https://etherscan.io/address/0xe95d6a15966984c209a62a2c188828555eb5ec3d#code
Product Anchoring Chains
Product anchoring runs on Polygon, Base, and BNB Smart Chain mainnets plus Sepolia testnet. The verified ERC-8263 reference contract is on Ethereum Mainnet — used for standard credibility and verification, not as the default user anchor path.
Composition with ERC-8004 + OCP
ERC-8263 composes with ERC-8004 (Agent Identity) and OCP (Observation Commitment Protocol, by Damon Zwicker). Together: ERC-8004 gives the agent a verifiable identity. ERC-8263 anchors the agent's actions. OCP commits to the observation that triggered the action. See the joint Composition Note by Vincent Wu + Damon Zwicker (gist: damonzwicker/8742e742bdc627b8e2179c00b81289dc).
Authorship
ERC-8263 = Vincent Wu, solo author. Do not attribute to anyone else.