Evidence row 2201794

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://geo-calc.x402tookit.com/polygon-area"
    ]
  ],
  "name": "Geo Calc",
  "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": "Area, perimeter and centroid of a lat,lon polygon using spherical excess on the WGS84 equal-area sphere.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "points": "40,-100;40,-90;35,-90;35,-100"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "areaAcres": 121183721.9664,
              "areaHectares": 49041312.353,
              "areaKm2": 490413.12353,
              "areaM2": 490413123530.02,
              "asOf": "2026-10-11T08:41:07.797Z",
              "centroidLat": 37.57752478,
              "centroidLon": -95,
              "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.",
              "method": "spherical excess, WGS84 authalic sphere (not ellipsoidal)",
              "notChecked": [
                "ellipsoidal geodesic area: this is a spherical (equal-area sphere, great-circle edges) area; against GeographicLib's ellipsoidal polygon area measured difference was 0.0009 percent for a 10 by 5 degre…",
                "the polygon's holes or multiple rings",
                "…2 more"
              ],
              "orientation": "COUNTERCLOCKWISE",
              "perimeterKm": 2875.86204,
              "perimeterM": 2875862.04,
              "reasons": [
                "Spherical area on the WGS84 authalic sphere; vertex order is counterclockwise."
              ],
              "selfIntersecting": false,
              "source": "Spherical excess on the WGS84 authalic sphere (R = 6371007.1809 m), computed locally",
              "summary": "4 vertices enclose 490413.1235 km2 (121183721.966 acres) with perimeter 2875.862 km.",
              "valid": true,
              "verdict": "COMPUTED",
              "vertices": 4
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "points": {
                      "description": "Vertices as lat,lon;lat,lon;... (3 to 300, ring may or may not repeat the first point)",
                      "type": "string"
                    }
                  },
                  "required": [
                    "points"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "areaAcres": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "areaHectares": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "areaKm2": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "areaM2": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "centroidLat": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "centroidLon": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "method": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "orientation": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "perimeterKm": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "perimeterM": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "selfIntersecting": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "valid": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "vertices": {
                      "type": [
                        "null",
                        "number"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:25:31.294Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:25:31.131Z"
    },
    "resource": "https://geo-calc.x402tookit.com/polygon-area",
    "serviceName": "Geo Calc",
    "tags": [
      "polygon",
      "area",
      "centroid",
      "geodesy"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Area, perimeter and centroid of a lat,lon polygon using spherical excess on the WGS84 equal-area sphere."
}

What the leaf hashes

{"body":"9d4346dc801f131b1e43f882db5962f1ce4e792edc844c786a33ee8995e0084e","id":2201794,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646808926722,"prev":null,"subject":"x402_bazaar:https://geo-calc.x402tookit.com/polygon-area","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. 0xb40c2689c2720668e7deee769366bc2ee798e63115b3ab145327df2c2d721f83
2. 0xaf3de41095c8d6a05e5d1022ee6f858c78d7aa098482af86acec6885218a79de
3. 0x93fe220d6fd0b1f760d72258bf9dd6615e56daa040dd2f07752abce9385989cb
4. 0x59a4707d6a33c500814383f7f736bf8da12e6011b4c711696288b49fd2500294
5. 0xcc2ccde654cac06269baa46cda5601e0e2f04bf7427f52bcd86e7e5e7ea35438
6. 0x64046f696a93df57e7a2775c759dc4f541c19f03fd56fcf560bcae0cf6c6b1d1
7. 0x81c77afd94e27e992932788e8609dfc9cf4c1cfb632b9e562caa9a22ecc3d5d0
8. 0x093d0efaf96cbff8912c59d6bdcd570da3c8a4c596b9fbb538077e6d16efcd57
9. 0xcef2ced7415ab7447e414ac706652d2f5fdd5982e653f936f098e0575e63bb3c
10. 0x74da005d328a1fc0d3e212efba48a8af218648b31ea47c886eba2d2523ab1fa0
11. 0x4b73edf36be1455061b42d181bf1261a1a1aab171bf37e6107e4dae40d9756e1
12. 0x21e290c87b8dfbee1c890c9b97a09ed0f5503884eaeabff86472db1c091c14cd
13. 0x8f3b097427a1bfae26e9231cb5b00552011a27ad93aa4c0d3e267190fcbbb962
14. 0x08da04eef748b7ac08271324db18913501d72c52afa240bf3f08b6da46e3b97f
15. 0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644
16. 0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7
17. 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af