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            "client_timestamp": "2026-07-03T12:00:00Z",
            "model_id": "openai/gpt-5",
            "prompt": "What is 2+2?",
            "response": "4"
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          "bodyType": "json",
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          "type": "http"
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            "anchor": {
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            "attestation_id": "att_0123456789abcdef01234567",
            "client_timestamp": "2026-07-03T12:00:00Z",
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            "properties": {
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                    "description": "ISO-8601 time the inference ran (optional; included in the content hash)",
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                  "metadata": {
                    "description": "Optional caller metadata, <= 4 KB — accepted but NOT persisted or hashed (reserved for future opt-in retention)",
                    "type": "object"
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                    "description": "Model identifier, e.g. openai/gpt-5 or claude-fable-5",
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                    "description": "Exact prompt/input sent to the model",
                    "type": "string"
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                    "description": "Exact model output being notarized",
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                  }
                },
                "required": [
                  "prompt",
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                  "model_id"
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              "type",
              "method",
              "bodyType",
              "body"
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              "example": {
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                    "type": "string"
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                  "anchor": {
                    "properties": {
                      "status": {
                        "type": "string"
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                    "type": "object"
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                  "attestation_id": {
                    "type": "string"
                  },
                  "client_timestamp": {
                    "type": [
                      "string",
                      "null"
                    ]
                  },
                  "content_hash": {
                    "description": "sha256 hex over canonical {prompt, response, model_id, client_timestamp}",
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                  },
                  "model_id": {
                    "type": "string"
                  },
                  "notarized_at": {
                    "type": "string"
                  },
                  "payload_stored": {
                    "description": "false by default: prompt/response/metadata are not persisted",
                    "type": "boolean"
                  },
                  "receipt_token": {
                    "description": "Private receipt token; payload is not stored by default",
                    "type": "string"
                  },
                  "receipt_url": {
                    "type": "string"
                  },
                  "signature": {
                    "description": "base64 Ed25519 signature by the notary key",
                    "type": "string"
                  },
                  "signer_pubkey": {
                    "description": "base64 raw Ed25519 public key",
                    "type": "string"
                  }
                },
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              },
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                "type": "string"
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