{"$schema":"https://ar-agents.ar/schemas/anchor-chain.v1.json","spec":"https://ar-agents.ar/rfcs/006","head":{"seq":80,"hash":"2753593a51f205af51d66b357dc81bc01384b0932874dd87b9e0215b74d263fc"},"count":2,"anchors":[{"seq":1,"headSeq":3,"headHash":"419a3b97ebe5ca3b27d4102cac88d059f52426b04a36c3de4016e1608e6c6e49","prevAnchor":"GENESIS","ts":"2026-06-11T14:03:51.515Z","signature":"61b20a233a036e8ec91cf8c88465427c3f7d5e33a541783e55080ee29c32fd5f"},{"seq":2,"headSeq":11,"headHash":"9f2e52d6de1ac6c3308dca12eec32372556812b349cabc584626ff77d0556b17","prevAnchor":"61b20a233a036e8ec91cf8c88465427c3f7d5e33a541783e55080ee29c32fd5f","ts":"2026-07-02T07:23:23.502Z","signature":"55710fb89286b1b0e2ff855a4d0200cfb1ad399e82d98548410cf933edab7c04"}],"verification":{"valid":true,"count":2},"proofs":{"2":{"type":"opentimestamps","otsBase64":"AE9wZW5UaW1lc3RhbXBzAABQcm9vZgC/ieLohOiSlAEIN1hHNUv+7I/jY5aT1P7EsX2ROMwYFtSkSDRQXkUvFFHwCKLP48KU/KlvCPAgxZ69TGqaYeIbIB08pbwCgsl64LkSajZn2siQpfuR488I8BC40oOCeDcEREv+/EbJ46cjCPAgPqHpiZmqxnOzAkj2jozncjSmvUSOq3sGmsnOW2adyYcI8CB/jRcKXfMZU3NzLhlIEL4cDtXLCS8YZS9PflEjSTREnAjxBGpGEe3wCFxUkRMfRaNZAIPf4w0u+QyOLi1odHRwczovL2FsaWNlLmJ0Yy5jYWxlbmRhci5vcGVudGltZXN0YW1wcy5vcmc=","digest":"375847354bfeec8fe3639693d4fec4b17d9138cc1816d4a44834505e452f1451","digestAlg":"sha256","status":"pending","submittedAt":"2026-07-02T07:23:25.484Z"}},"publicTimestamp":"Each proof commits sha256(canonical006(AnchorBody)) — the same bytes the HMAC anchor signs — to the public Bitcoin calendars via OpenTimestamps. Fetch the raw .ots at /api/audit/anchor/{seq}/ots and run `ots verify` against Bitcoin: no ar-agents key is in the trust path. Pending proofs upgrade to a Bitcoin-confirmed attestation over hours (GET ?upgrade=1).","witness":"Store any anchor you fetch. Once you hold anchor N, history at or below headSeq N cannot be rewritten without detection."}