Evidence row 278643

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://headlessoracle.com/v5/status/x402"
    ]
  ],
  "name": "headlessoracle.com/v5/status/x402",
  "owner_address": "0x26d4ffe98017d2f160e2daae9d119e3d8b860ad3",
  "raw": {
    "accepts": [
      {
        "amount": "1000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x26D4Ffe98017D2f160E2dAaE9d119e3d8b860AD3",
        "scheme": "exact"
      }
    ],
    "description": "Signed market-state receipt for one exchange. OPEN/CLOSED/HALTED/UNKNOWN - Ed25519 signed, 60s TTL.",
    "extensions": {
      "bazaar": {
        "info": {
          "category": "financial-data",
          "description": "Ed25519-signed market-state receipt for one of 28 global exchanges. Pre-trade verification gate for autonomous financial agents. UNKNOWN = CLOSED (fail-closed). 60-second TTL. Holiday-aware, DST-correct, real-time halt detection for XNAS and XNYS only; schedule-based for the other 26.",
          "documentationUrl": "https://headlessoracle.com/docs",
          "exampleNote": "output.example is a real receipt captured 2026-06-05T16:03:15Z. Its Ed25519 signature verifies against key_2026_v1 published at /v5/keys (now expired by TTL - schema-illustrative).",
          "family": "market-state",
          "input": {
            "method": "GET",
            "queryParams": {
              "mic": "XNYS"
            },
            "type": "http"
          },
          "metadataUrl": "https://headlessoracle.com/.well-known/mcp/server-card.json",
          "output": {
            "example": {
              "expires_at": "2026-06-05T16:04:15.257Z",
              "halt_detection": "active",
              "issued_at": "2026-06-05T16:03:15.257Z",
              "issuer": "headlessoracle.com",
              "mic": "XNYS",
              "public_key_id": "key_2026_v1",
              "receipt_id": "eb2a23e4-c3cc-49dc-aa1e-e443eb89045e",
              "receipt_mode": "live",
              "schema_version": "v5.0",
              "signature": "ab5413710ca2c4b71a5241efe3be386b6e2d3e1746deb1686e42c2f718cdb76e6e4e5a077817c972e8c1c04a301da5465b147b533fc1e4505523f81d35b98901",
              "source": "SCHEDULE",
              "status": "OPEN"
            },
            "format": "application/json",
            "type": "json"
          },
          "pricingUrl": "https://headlessoracle.com/v5/pricing",
          "tags": [
            "market-state",
            "exchange-status",
            "pre-trade",
            "attestation",
            "Ed25519",
            "trading-hours",
            "holiday-calendar",
            "fail-closed",
            "28-exchanges",
            "signed-receipt",
            "MIC",
            "ISO-10383"
          ]
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ]
                },
                "queryParams": {
                  "additionalProperties": false,
                  "properties": {
                    "mic": {
                      "description": "ISO 10383 Market Identifier Code",
                      "enum": [
                        "XNYS",
                        "XNAS",
                        "XLON",
                        "XJPX",
                        "XPAR",
                        "XHKG",
                        "XSES",
                        "XASX",
                        "XBOM",
                        "XNSE",
                        "XSHG",
                        "XSHE",
                        "XKRX",
                        "XJSE",
                        "XBSP",
                        "XSWX",
                        "XMIL",
                        "XIST",
                        "XSAU",
                        "XDFM",
                        "XNZE",
                        "XHEL",
                        "XSTO",
                        "XCBT",
                        "XNYM",
                        "XCBO",
                        "XCOI",
                        "XBIN"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "mic"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http"
                }
              },
              "required": [
                "type",
                "method",
                "queryParams"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "coverage": {
                      "description": "JSON-encoded string inside the signed bytes; JSON.parse it after verifying the signature. Added to the signed payload by commit 19ccb28 (2026-09-07); the example below predates it.",
                      "type": "string"
                    },
                    "expires_at": {
                      "description": "issued_at + 60s. Signed into the canonical payload - consumers must reject expired receipts.",
                      "format": "date-time",
                      "type": "string"
                    },
                    "halt_detection": {
                      "enum": [
                        "active",
                        "schedule_only"
                      ]
                    },
                    "issued_at": {
                      "format": "date-time",
                      "type": "string"
                    },
                    "issuer": {
                      "const": "headlessoracle.com"
                    },
                    "mic": {
                      "description": "ISO 10383 Market Identifier Code",
                      "type": "string"
                    },
                    "public_key_id": {
                      "description": "Active key ID published at /v5/keys",
                      "type": "string"
                    },
                    "receipt_id": {
                      "format": "uuid",
                      "type": "string"
                    },
                    "receipt_mode": {
                      "enum": [
                        "demo",
                        "live"
                      ]
                    },
                    "schema_version": {
                      "const": "v5.0"
                    },
                    "signature": {
                      "description": "Ed25519 signature over canonical (alphabetical, no-whitespace) JSON of the payload, hex-encoded.",
                      "pattern": "^[0-9a-f]{128}$",
                      "type": "string"
                    },
                    "source": {
                      "enum": [
                        "SCHEDULE",
                        "OVERRIDE",
                        "SYSTEM",
                        "REALTIME"
                      ]
                    },
                    "status": {
                      "description": "UNKNOWN must be treated as CLOSED (fail-closed contract).",
                      "enum": [
                        "OPEN",
                        "CLOSED",
                        "HALTED",
                        "UNKNOWN"
                      ]
                    }
                  },
                  "required": [
                    "receipt_id",
                    "issued_at",
                    "expires_at",
                    "issuer",
                    "mic",
                    "status",
                    "source",
                    "halt_detection",
                    "receipt_mode",
                    "schema_version",
                    "public_key_id",
                    "signature"
                  ],
                  "type": "object"
                },
                "format": {
                  "const": "application/json"
                },
                "type": {
                  "const": "json"
                }
              },
              "required": [
                "type",
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T15:38:53.792Z",
    "quality": {
      "l30DaysTotalCalls": 15,
      "l30DaysUniquePayers": 9,
      "lastCalledAt": "2026-10-26T15:38:53.329Z"
    },
    "resource": "https://headlessoracle.com/v5/status/x402",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Signed market-state receipt for one exchange. OPEN/CLOSED/HALTED/UNKNOWN - Ed25519 signed, 60s TTL."
}

What the leaf hashes

{"body":"33c9769d2c8bcff6988b6fc9332da36a8c132b9a1efcbaaabfdffd57d847af95","id":278643,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793042078336627,"prev":261454,"subject":"x402_bazaar:https://headlessoracle.com/v5/status/x402","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x94744e30400df36f3e506bc47a533196aaf8416054f145be99d240b7d8b3e04f
2. 0x4b1002b2f21d031df2febc66f3f022012996eb64afc55a2b41ea5cb1b848e8dc
3. 0xcffe01d0cf5eaf31a4bb28c7f7ed50fcbe9b594efe859de500a15f212efc6004
4. 0x430daadfe4cca8134822999ea2872bbb550fccd8eff329f7a15472b2bcc3d673
5. 0x10e771993b9118c66f7319425b09345a0907872d1c4f42b06db2d4d0622e44a5
6. 0xa856e0085e9f2d293d9f76ab874c7c2a3c3ef1d7a52ee9450b33732baf86512a
7. 0x8c01165bab07de48539e8d1a59a35212938ecb068f434ffaa6d738645c33b360
8. 0xe98cd42153a8647ebdb77441d8fb2dddfd77d1205f1167600d6c90ae192bd3de
9. 0x7c75f9d4cbfc1b93420f41134fe41fa02476e8f7f3a85712cb20fa231a7d4e51
10. 0x07fa9991702d9e756ee102ffd8326f6ed64c777e9ef41d71d141c1c37856f00e
11. 0x4c1c9421c6648584bc5a6ac33a99ef69338fb841b9063ca93df8c027794ce0e5
12. 0x12169ac86722058ecf46a1b83c56e8b21899ab108a12c5a4429da74c5d191294
13. 0xb314422bc93e7f1c0b706c67f5fff96c5ddf74934bb2fe8ab6291ae016907e37
14. 0x49062da782c4f73855ddd5fdd51840749f928b5f17d1ce75ac50f2d829104e72
15. 0xf0bd63870f0bb378fa300bd33563050dcb7b3e02b44eb3ee550c1c534ec4b246
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae