Evidence row 2204438

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://nordland.halowerk.com/v1/is-ruggedness"
    ]
  ],
  "name": "HALOWERK Nordic Land",
  "owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
  "raw": {
    "accepts": [
      {
        "amount": "3000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "asset": "USDC",
          "assetTransferMethod": "eip3009",
          "eip712Domain": {
            "chainId": 8453,
            "name": "USD Coin",
            "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "version": "2"
          },
          "name": "USD Coin",
          "network_name": "Base Mainnet",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "recipient": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "scheme": "exact"
      },
      {
        "amount": "3000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F"
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "6pXwvPgqduMSx33GP8jiVCanpUhZZiPPyG784mNJ7q1Z",
        "scheme": "exact"
      }
    ],
    "description": "Standard deviation of sampled surface elevations. The coordinate is validated against the Natural Earth boundary for Iceland; results outside it are rejected before payment.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "latitude": 64.1466,
              "longitude": -21.9426
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "authoritative_status": "preliminary_non_binding",
              "category": "country",
              "charged": false,
              "checked_at": "2026-10-23T02:05:19.694Z",
              "confidence": 0.87,
              "confidence_method": "Conservative minimum source-family basel",
              "data_date": "2015-12-31T23:59:59.000Z",
              "evidence_classification": "derived_from_open_geodata",
              "generated_at": "2026-10-23T02:05:19.694Z",
              "result": "measurement_available",
              "risk_level": "not_applicable",
              "service": "is-ruggedness",
              "service_id": "eli-0105",
              "status": "success",
              "summary": "Iceland: Terrain ruggedness: source-back"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "$schema": "http://json-schema.org/draft-07/schema#",
                  "additionalProperties": false,
                  "properties": {
                    "latitude": {
                      "description": "WGS84 latitude inside the published European coverage.",
                      "maximum": 72.5,
                      "minimum": 34,
                      "type": "number"
                    },
                    "longitude": {
                      "description": "WGS84 longitude inside the published European coverage.",
                      "maximum": 40.5,
                      "minimum": -31.5,
                      "type": "number"
                    }
                  },
                  "required": [
                    "longitude",
                    "latitude"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {},
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type",
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      },
      "payment-identifier": {
        "info": {
          "required": false
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "id": {
              "maxLength": 128,
              "minLength": 16,
              "pattern": "^[a-zA-Z0-9_-]+$",
              "type": "string"
            },
            "required": {
              "type": "boolean"
            }
          },
          "required": [
            "required"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-02T17:01:42.54Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-11-02T17:01:42.3Z"
    },
    "resource": "https://nordland.halowerk.com/v1/is-ruggedness",
    "serviceName": "HALOWERK Nordic Land",
    "tags": [
      "land",
      "europe",
      "country",
      "is",
      "ruggedness"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Standard deviation of sampled surface elevations. The coordinate is validated against the Natural Earth boundary for Iceland; results outside it are rejected before payment."
}

What the leaf hashes

{"body":"bd9c1ddbba133c4fce587332741d7e21f2e5101c433fab8b852abcb8e783e069","id":2204438,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646905743589,"prev":null,"subject":"x402_bazaar:https://nordland.halowerk.com/v1/is-ruggedness","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0x4c5c705188cef84dcc6e954691bf5172aba654e8fa493a80b4b78670d102c667
2. 0xb8e25b24f95b37c2ca4af96ffc826ccd0bb9673d9aab0a8743f99acf4fac12d2
3. 0xac660f2338437a11956cb6e71ed0f5d3114c749392abe42e01ae371725d451a3
4. 0xb2c726772712aaa7ace8a8c07380ab0dd748df63c7f1fd4587046165f6fc2b36
5. 0x49a607fd0d3e4db1f3c0e5fe7470c05e1d8b3dfd04690c4a8a56098ef7610582
6. 0x996272df8b90ff88218e8c284820b94057a259fda8954445f9cb335079b8bef1
7. 0x667195abbea1c6f37113570511f116b11137b8656616c8ccf89593abff3e1406
8. 0xa1808f5d35618b5436f719f70dd0f69930f9719fe6c4e3f131848405024a9322
9. 0x7b6134dd333f5f3b66dc871d97bf009cb95c9baa3971180388d718f4b712dd59
10. 0xc07878035a5d366fa1ca2e2da8b55040e5de87c7dd625ca73b273e1c3a07db9e
11. 0x23469d10eca76db14ffb838a85f97f269ab4a0e0f10f7093129e367f23ff74b9
12. 0xa75340e0bbabb2f0ca98fb3825535e0c36ea9da96d1d4b1af9ca29649e0fc148
13. 0xc2ea6f7cdcf0c6904201c0d186a72f2a6fa2d355f41deec0e55aad057d5b8897
14. 0xf01d425f0c05ac504062d9b471f06fbf10480b3526efb1ee77bb71aebd05f0de
15. 0x67c99d356de30f9cfab88af48fbaa18909ef230dd09947e84da060bc03aca929
16. 0x1068659ec8f2bcf26e4ad39786557a8c45d60e5ebba4fce2fb9962b2c9c59920
17. 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af