Evidence row 2201621

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://map-tiles.x402tookit.com/zoom-for-extent"
    ]
  ],
  "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": "Highest map zoom level at which a lat/lon bounding box fits a viewport of given pixel size, with centre and tile span.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "east": 0.3,
              "north": 51.7,
              "south": 51.3,
              "viewportHeight": 600,
              "viewportWidth": 800,
              "west": -0.5
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T00:57:26.061Z",
              "centerLatitude": 51.500439,
              "centerLongitude": -0.1,
              "clampedToMaxZoom24": false,
              "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.",
              "fractionalZoom": 10.3588,
              "limitedBy": "height",
              "notChecked": [
                "the maximum zoom your tile source supports",
                "rounding behaviour of your map library (fractional zoom)",
                "…1 more"
              ],
              "reasons": [
                "Zoom = log2(viewport pixels / (256 x box fraction of the world)), taking the tighter of width and height, rounded down."
              ],
              "source": "computed locally (Web Mercator fit)",
              "summary": "Fits at zoom 10 (fractional 10.359); limited by height; 3 x 3 tiles cover it.",
              "tileCount": 9,
              "tilesHigh": 3,
              "tilesWide": 3,
              "verdict": "COMPUTED",
              "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": {
                    "east": {
                      "description": "East longitude",
                      "type": "number"
                    },
                    "north": {
                      "description": "North latitude",
                      "type": "number"
                    },
                    "paddingPx": {
                      "description": "Padding on every side in pixels (default 0)",
                      "type": "integer"
                    },
                    "south": {
                      "description": "South latitude",
                      "type": "number"
                    },
                    "viewportHeight": {
                      "description": "Map viewport height in pixels (default 600)",
                      "type": "integer"
                    },
                    "viewportWidth": {
                      "description": "Map viewport width in pixels (default 800)",
                      "type": "integer"
                    },
                    "west": {
                      "description": "West longitude",
                      "type": "number"
                    }
                  },
                  "required": [
                    "west",
                    "south",
                    "east",
                    "north"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "centerLatitude": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "centerLongitude": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "clampedToMaxZoom24": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "fractionalZoom": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "limitedBy": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "tileCount": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "tilesHigh": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "tilesWide": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "zoom": {
                      "type": [
                        "null",
                        "number"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:35:56.729Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:35:56.544Z"
    },
    "resource": "https://map-tiles.x402tookit.com/zoom-for-extent",
    "serviceName": "Map Tile Maths",
    "tags": [
      "zoom",
      "bbox",
      "viewport",
      "fit-bounds"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Highest map zoom level at which a lat/lon bounding box fits a viewport of given pixel size, with centre and tile span."
}

What the leaf hashes

{"body":"75e8f2ab086811972ca38ef8112e595e194f403a26476d1e6657049c2b3988d2","id":2201621,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806925090,"prev":null,"subject":"x402_bazaar:https://map-tiles.x402tookit.com/zoom-for-extent","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. 0x3a53e616391ac1fd1a23fc23db60dbb8bc483f334513c3f0d7638d6003b562a5
2. 0x89f2ea6de977bad4cff7bfa2d2154ceb961c242ca51feb7c35efda43f8fdae62
3. 0xae17fade4a1e31d4ca89f694c23dd65cd29e3b861347e7df1f1836b0981d4b43
4. 0x42f1472bea62002c05627ac7c411960a11e1e3a07d4a8b83f79f8bc35974c6da
5. 0x738a2fbf1f01737aba3c3d2c6d6220cb8379094216b2bfbc907f62c9044adc9d
6. 0x66f3b6531bc5affdf8e71eba962457d7b3c9b5564614b3d0453aab0242bc239e
7. 0x5fbd7d90cd62c4fb2064058865d99a0503536936b497b94f3fcfea6f25230fcd
8. 0x2e56c356eefd099b9f35538064e6dda341147591a3393c2a3bfd85bcd44d8a55
9. 0x527ae85ae5b0d9d4aeea383bd612be54925a537f50d6ad8b8443edea720e5ee2
10. 0x8225e50d522a56b23e54582109102b6e7bf6c968f63dd56e71e8a8f34a5aea90
11. 0x8d84bcdca6e904bba23b61a48a5a434a2095ce919ce9d83620cd444da0e0547d
12. 0xce9bf2fb06edf633b852c2a929fe0335a13dcc34aa7487c05c9c839715c4ed14
13. 0xaee6ec4fc06e2edf4e7718ad8b87a20e5863c6d259df1046ee61e5a22ea253b8
14. 0x637ba5f029eadccf80c2665ace422cf50802b8ffd21717811c25c8f068f65dc8
15. 0x8448bd1fe3c2d48b62a118ace4a5cb82fee53586dd43d776c2526ad844398919
16. 0x8760c227928c5295506cd8606e763f86cf8cd2a549820fab4dc86d29ca0d816d
17. 0xa20b9be86af7d690e040c9060a373b2fc5498edf3432f43c26f74fa2febc1e9a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af