Evidence row 426637

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://x402-lab.vercel.app/api/postcode/:postcode"
    ]
  ],
  "name": "UK Postcode Lookup",
  "owner_address": "0xd0a3c0f5612ecd88e4b16ef1cd458e1a5e8ffd49",
  "raw": {
    "accepts": [
      {
        "amount": "2000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xd0A3c0f5612EcD88e4b16Ef1cD458e1a5E8FFD49",
        "scheme": "exact"
      }
    ],
    "description": "Location and areas for a Great Britain postcode: latitude and longitude, ward, district, constituency and region, as JSON.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "pathParams": {
              "postcode": ":postcode"
            },
            "queryParams": {},
            "type": "http"
          },
          "output": {
            "example": {
              "constituency": "Cities of London and Westminster",
              "country": "England",
              "district": "Westminster",
              "latitude": 51.50101,
              "longitude": -0.141563,
              "postcode": "SW1A 1AA",
              "region": "London",
              "ward": "St James's"
            },
            "type": "json"
          }
        },
        "routeTemplate": "/api/postcode/:postcode",
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "pathParams": {
                  "properties": {
                    "postcode": {
                      "description": "Great Britain postcode, with or without the space, any case. Northern Ireland (BT) is not supported.",
                      "type": "string"
                    }
                  },
                  "required": [
                    "postcode"
                  ],
                  "type": "object"
                },
                "queryParams": {
                  "properties": {},
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "constituency": {
                      "description": "Westminster parliamentary constituency (2024 boundaries)",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "country": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "district": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "latitude": {
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "longitude": {
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "postcode": {
                      "type": "string"
                    },
                    "region": {
                      "description": "English region; null in Scotland and Wales",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "ward": {
                      "type": [
                        "string",
                        "null"
                      ]
                    }
                  },
                  "required": [
                    "postcode"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-27T03:07:31.962Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-27T03:07:31.74Z"
    },
    "resource": "https://x402-lab.vercel.app/api/postcode/:postcode",
    "serviceName": "UK Postcode Lookup",
    "tags": [
      "uk",
      "postcode",
      "geocoding",
      "location",
      "address"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Location and areas for a Great Britain postcode: latitude and longitude, ward, district, constituency and region, as JSON."
}

What the leaf hashes

{"body":"403a25c384411aaf85d24f3d7465626e5b970d25ac85d361f48854c5279277eb","id":426637,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793086296846117,"prev":416631,"subject":"x402_bazaar:https://x402-lab.vercel.app/api/postcode/:postcode","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0x2d6e88fd7adfa78303b5a898dfa56669cb313537693c2b2122826f026816038b
2. 0xcdb68d658d713db39c40ae5d4e92bd3700f9d9332379747f61cc7e3a01948b50
3. 0x3c17ca2c4ad205d33683e126827f29ff64e80afc84bb73b8b102ca0240f76bdd
4. 0x8e1c846a47f63bc4f0487c0ff85ea3ec32ec1216d9e75e39bed4b3efddb8355f
5. 0x7a98d5d2374e0d5365ea397a5d00de6be49a43fd8e1f57751beb42913cdbe0a3
6. 0x048b58a6eb36e1fbd03a98ac1e23a5e80011edd63b77c75b57ad9406f07e0dca
7. 0x25e7ff349af9109a98c1ee433935f7ea947bda2b269b37e193cf4146d954c41d
8. 0x85b36f43520a008bcc49bb480f77fd37637e9c46edf00b60af5dacdd33ec130b
9. 0x6537da14b63ca5d8b04fe8f8443dd159e9c8e8ecdd901e3c44aad308f985f680
10. 0x8fa5ec375695a0bd09304a4ae0b7dc2b196dd997da1bdc8869bd60fea2c1a0de
11. 0xb9043caa2927f8e7e67754baf8d214c2650beb6c10faecdcd65ac501d9a41dc5
12. 0xbba37928cada6ab17c662e87851d940dd07cc2323bc089da77c1f353a0c5e936
13. 0xf9e544d10b80657275e1e196da89ba5336a7cc49eaa0d6d801fb5d632cf5deec
14. 0x8ff18b1523f9fbdd16a5796cbe184b46854c06256508af8de5509b598370c725
15. 0xa383a1cfe9b3f6af67eb4c7642564b9424d46d7fca90e7ba175d549f8b67dd0c
16. 0x52efa60e0c3d8525486d2310eb3b6b566c9677c64fd1f819edb072cf101bcbdb
17. 0x22c1fb9487ee0b9732fa017a0cc321eb27a60c08450d112f755089796e12cb1c
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4