Evidence row 2202109

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://chess-notation.x402tookit.com/square-distance"
    ]
  ],
  "name": "Chess Notation Tools",
  "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": "Distance between two chess squares as king moves, rook moves, bishop moves and knight moves on an empty board.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "from": "a1",
              "to": "h8"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T01:02:04.371Z",
              "bishopMoves": 1,
              "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.",
              "fileDifference": 7,
              "from": "a1",
              "kingMoves": 7,
              "knightMoves": 6,
              "manhattan": 14,
              "notChecked": [
                "blocking pieces (the board is empty)",
                "legal-move restrictions such as pins",
                "…1 more"
              ],
              "queenMoves": 1,
              "rankDifference": 7,
              "reasons": [
                "King distance is the larger of the file and rank gaps; a bishop only ever reaches squares of its own colour."
              ],
              "rookMoves": 2,
              "sameColorSquares": true,
              "source": "computed locally (breadth-first search and geometry)",
              "summary": "a1 to h8: king 7, rook 2, bishop 1, knight 6 move(s).",
              "to": "h8",
              "verdict": "COMPUTED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "from": {
                      "description": "First square such as a1",
                      "type": "string"
                    },
                    "to": {
                      "description": "Second square such as h8",
                      "type": "string"
                    }
                  },
                  "required": [
                    "from",
                    "to"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "bishopMoves": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "fileDifference": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "from": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "kingMoves": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "knightMoves": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "manhattan": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "queenMoves": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "rankDifference": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "rookMoves": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "sameColorSquares": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "to": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:42:06.887Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:42:06.723Z"
    },
    "resource": "https://chess-notation.x402tookit.com/square-distance",
    "serviceName": "Chess Notation Tools",
    "tags": [
      "chess",
      "distance",
      "knight",
      "king"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Distance between two chess squares as king moves, rook moves, bishop moves and knight moves on an empty board."
}

What the leaf hashes

{"body":"1652a21c6854a641cee857b994540c9b08bf51eb2e33abcce52a86503f93630f","id":2202109,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812521307,"prev":null,"subject":"x402_bazaar:https://chess-notation.x402tookit.com/square-distance","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. 0x77a0d56c45cb8e77aecadac261c1154fc107366fd7180aa643df2ccaf9c5bd5d
2. 0x83ec488c82773c463ffa01d1361d03a01ee1358a848420abddcc3eb698dba83b
3. 0xbfb25ce07473267b0fe4132c20e816feff32880a1ee7345cbeea75542d0a2bf3
4. 0x79af5256af5a8318103821fc4ec9e4b5b367cd1a0c0eba4212235065febcb8bb
5. 0x0f9fe36850112119f6ce34de4dc23be72f5885882eb78e2fb9dd7dd670de7305
6. 0xc3c50e44a0bb5bf0ad9a2dcfd42d596723ba6af02d807c68ab0fe45e87f1002e
7. 0x98773af0625f4d9afa796645377a33fc1fa6356e2a69465afc7193edea77291b
8. 0x0d0159280a0a67161091868702abb6087c32c36853f20ad0ee438c5ac5bbf7da
9. 0x58a2d8e142aa50a86e4d027828f61e1b125d2cb9e1c61a15d4b4f242f713832a
10. 0xba12e3b4d0e96f613b2eab77a258673d8ca03d4ac20278ed6ee40fb1d5e8842c
11. 0xdeeb5f92493e59d2154902d4ee7dfea8f75fec3f49cfeedf2f732858749c635b
12. 0xbe5fee1429543a8ea2aacf3591e5b69c6a6b1568088eb7a4e6b02ded16c5d3e5
13. 0x98c0b976487311f03693fca7825f5f6e75a71ea33ac90caf33040d5eaa6d0b54
14. 0xe387a7d610f91d4dc112f2dbdf7ae32c4555f5da4c25c1a9a1310d0b74e80bbf
15. 0x60dd7fd8117cbf3b80707f722623736c8c2b5b56277e8e78c9f81ef2dab8deab
16. 0x3b89dd05634a82075204d3c671f613081ddfd9df739c64c0a8f39081bdfa32c7
17. 0x1805ef693fbdb2c23fcb61616f830408ca89bec1dc5b68ee47a770ffc0b9760a
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af