Signed receipt for one agent action. Post an x402 payment intent or MCP tool call (optional policy + settlement outcome) and get a canonical HMAC-signed record: binding hash, verdict, findings, and a free public verify URL third parties can check without trusting your agent's logs. Loop it after every payment or tool call to build a tamper-evident audit trail. Canonicalization hermes-stable-json-v1; org history and probes available on Assurance plans.

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