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Evidence row 2202114

Observed , by sync.x402_bazaar/1.

Kind
listing
About
source_record x402_bazaar:https://chess-notation.x402tookit.com/fen-board
Recorded
Previous row
None: the first of its kind about this subject
Body SHA-256
1aff0863f3dce4dad6fb7ff9f11f131e128340e0590f1ee6abe48f6292bfef3e
Leaf
0xfe12dc06e6985e65842cd4c780834f4808286937e76146241748d19567f326f8

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://chess-notation.x402tookit.com/fen-board"
    ]
  ],
  "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": "Render a FEN position as an 8x8 ASCII board (White at the bottom) plus a piece-by-square list.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "fen": "r1bqkbnr/pppp1ppp/2n5/4p3/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 2 3"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T01:02:03.062Z",
              "ascii": "8 r . b q k b n r\n7 p p p p . p p p\n6 . . n . . . . .\n5 . . . . p . . .\n4 . . . . P . . .\n3 . . . . . N . .\n2 P P P P . P P P\n1 R N B Q K B . R\n  a b c d e f g h",
              "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.",
              "notChecked": [
                "position legality (use /fen-parse)",
                "whose move or any rights beyond the placement"
              ],
              "pieceCount": 32,
              "pieces": [
                {
                  "color": "white",
                  "piece": "rook",
                  "square": "a1"
                },
                {
                  "color": "white",
                  "piece": "knight",
                  "square": "b1"
                }
              ],
              "reasons": [],
              "rows": [
                "8 r . b q k b n r",
                "7 p p p p . p p p",
                "…7 more"
              ],
              "source": "computed locally (FEN piece placement)",
              "summary": "32 piece(s) on the board.",
              "verdict": "RENDERED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "fen": {
                      "description": "A FEN string; only the first field (piece placement) is required",
                      "type": "string"
                    }
                  },
                  "required": [
                    "fen"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "ascii": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "pieceCount": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "pieces": {
                      "items": {
                        "properties": {
                          "color": {
                            "type": [
                              "null",
                              "string"
                            ]
                          },
                          "piece": {
                            "type": [
                              "null",
                              "string"
                            ]
                          },
                          "square": {
                            "type": [
                              "null",
                              "string"
                            ]
                          }
                        },
                        "type": "object"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "rows": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:41:52.607Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:41:52.323Z"
    },
    "resource": "https://chess-notation.x402tookit.com/fen-board",
    "serviceName": "Chess Notation Tools",
    "tags": [
      "chess",
      "fen",
      "board",
      "ascii"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Render a FEN position as an 8x8 ASCII board (White at the bottom) plus a piece-by-square list."
}

What the leaf hashes

{"body":"1aff0863f3dce4dad6fb7ff9f11f131e128340e0590f1ee6abe48f6292bfef3e","id":2202114,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812535496,"prev":null,"subject":"x402_bazaar:https://chess-notation.x402tookit.com/fen-board","subject_kind":"source_record"}

Proof

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

  1. 0xfe12b9374c60f46760618f161db2a542d0c6f1e435c436cab06b627ac3eec48e
  2. 0x5746a2e6242228c7a2d15c2030689c553aa895aca1512a1982e92fe670634a6a
  3. 0x9d5a5c3f11837f46bc55cd4c9428a959b311b0c3e4adc009d0a20a5b5135fd24
  4. 0x368e48b80d528a9f07895af7be22435c24c2ddfe7563bf70845d6b7f22f97806
  5. 0x63a655ccb0798cc81c89250786a5285732794be1332c13506bc408dae1d91f86
  6. 0x3f7aed1af1ab17ace9eb1d4ba5903fd349ab4668587e262c07612ac3591094bf
  7. 0x6b0ce10a04a8ad4c78b3eec958e92877d5f67eabb965e3f43b032c41310960a0
  8. 0xe8901e69e00db6153d98d928bf6fbd6a70c36b4a01231a22adc999b400e7d698
  9. 0x3ef66b6784e41169e3dbc47c5b44cce6c3cf58ae85f128cbb411b86eeeb93a63
  10. 0x3d9a759e51911e8b9c4fb2961369fdb88f7ede464bbe9c9e8155373312725994
  11. 0x809f7ca0c2751136c11aaa1b7cf40ea295c49d1e9dda5eca68178053a1104a49
  12. 0x558609da34276e08016027f0ba334013ad7a47d8258758a41e477a91a04eb076
  13. 0x2612b2a6ca482d4e1e568f2a6d1980f6401f76dd9a2480fd196bb762b9e1c71c
  14. 0x59ed3c823c7507ae1b2993d19eda543383739dde961b25c4e0927023fff6be12
  15. 0x4068a4306db47ea0eae5f76e5137753caa3dbb132dca6a61a4d6c1838a52700f
  16. 0x25127db2e775737b2874f6a159f7c1bf984317eea6482e94589c3ef4c5ccab32
  17. 0xec5d643575d83c9e07e65deeef71943b53cbf3007e7e2b9a6ef414081509b0cc
  18. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
Day root
0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
Chained
0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
Published
On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af

How to check it · This row as JSON