Evidence row 2201627

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://map-tiles.x402tookit.com/ground-resolution"
    ]
  ],
  "name": "Map Tile Maths",
  "owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "transactionVersions": [
            0
          ]
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      }
    ],
    "description": "Metres per pixel, map scale (1:N) and tile width on the ground for a zoom level and latitude.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "latitude": 51.5,
              "zoom": 10
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T00:57:24.496Z",
              "degraded": false,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "dpi": 96,
              "feetPerPixel": 312.2255,
              "latitude": 51.5,
              "metersPerPixel": 95.166338,
              "metersPerPixelAtEquator": 152.874057,
              "notChecked": [
                "ellipsoidal (true) distances: this is the spherical Web Mercator figure",
                "device pixel ratio (retina) effects on displayed scale",
                "…1 more"
              ],
              "reasons": [
                "Resolution halves with each zoom level and shrinks by cos(latitude)."
              ],
              "scaleDenominator": 359684,
              "source": "computed locally (Web Mercator ground resolution)",
              "summary": "Zoom 10 at 51.5 degrees: 95.1663 m per pixel, scale about 1:359,684 at 96 dpi.",
              "tileSize": 256,
              "tileWidthMeters": 24362.582,
              "tilesAcrossWorld": 1024,
              "verdict": "COMPUTED",
              "worldWidthPixels": 262144,
              "zoom": 10
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "dpi": {
                      "description": "Screen dpi for the scale denominator (default 96; 0.28 mm pixel standard if you send 90.71)",
                      "type": "number"
                    },
                    "latitude": {
                      "description": "Latitude within +/-85.0511 (default 0, the equator)",
                      "type": "number"
                    },
                    "tileSize": {
                      "description": "Tile size in pixels: 256 (default) or 512",
                      "type": "integer"
                    },
                    "zoom": {
                      "description": "Zoom level 0 to 24",
                      "type": "integer"
                    }
                  },
                  "required": [
                    "zoom"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "dpi": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "feetPerPixel": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "latitude": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "metersPerPixel": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "metersPerPixelAtEquator": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "scaleDenominator": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "tileSize": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "tileWidthMeters": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "tilesAcrossWorld": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "worldWidthPixels": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "zoom": {
                      "type": [
                        "null",
                        "number"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:35:40.08Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:35:39.79Z"
    },
    "resource": "https://map-tiles.x402tookit.com/ground-resolution",
    "serviceName": "Map Tile Maths",
    "tags": [
      "resolution",
      "scale",
      "zoom",
      "mercator"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Metres per pixel, map scale (1:N) and tile width on the ground for a zoom level and latitude."
}

What the leaf hashes

{"body":"3b132c74af963b905b593299e1ff5515a3a087d9574ad08a94b15015b03f22d5","id":2201627,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806943986,"prev":null,"subject":"x402_bazaar:https://map-tiles.x402tookit.com/ground-resolution","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. 0xb8afb86d01b5abd4c9ef5e57e150ff600f9da0f1cb4767ec1596e3a316ba923d
2. 0x7e5d577cbdfedf80dc5f0805eb533f80a701534495fbf339f7b0ec420d7a198a
3. 0xce9026ea15d850f8804e1fc406ead901aab13ff3f2838b95020c68fd1162d0af
4. 0x08b7e0d29c68beff54bb14d1a6783f7b1fb0c2c00badca73ed7b045218264763
5. 0x52b6e5d5f8de6a8bdaac56f3e471ae90afa493af3e0ef660f5882f0cf5cd1fcb
6. 0x27b2340f1e0df34664cbe6d0b53f0b203deabf2953f47038f0947cb2396c6708
7. 0x9980785c025b02b51111776a4ebc740fdc454814129fb97090f4e63ebc9e08de
8. 0xe9cb413db360cb1712794e635ac2a958ff3ef0fc0952a2c46f02f17002340e3b
9. 0xd57702c177aec3488948ae23027cc6d32f1b053f304255ec97784755b2d4c093
10. 0xf7a002b65dc08eb2d31e4c2527c17a9a288eceb01a5e3ca2b0ab67e6b9ab796a
11. 0xcdd0bf3077ebdb47e8782f3d79956fd430bac5729173d7f9a0ec212349000eb5
12. 0x203a0e1fcf7f6b3c1f6e99b559fa5b97c74c6f45b35f6eb08cb8521cdde39bc5
13. 0x080572f8942a728701d6e4c74c76b04c122aa149d1dbdef56feb8ce007a745b1
14. 0xc1d961be09ff84253ce4ecf4b141b3c25631ce9eb1cc0a3197e5d83d03240ee4
15. 0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644
16. 0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7
17. 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af