Evidence row 72315

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://chess402.vercel.app/api/cloud-eval"
    ]
  ],
  "name": "chess402.vercel.app/api/cloud-eval",
  "owner_address": "0xfbd46201267609ad3c66bd1b99b7f1cc80b1852f",
  "raw": {
    "accepts": [
      {
        "amount": "5000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xfbd46201267609ad3c66bd1b99b7f1cc80b1852f",
        "scheme": "exact"
      }
    ],
    "description": "Stockfish cloud evaluation for a FEN position. Returns depth, evaluation, and principal variation(s) when Lichess has the position cached.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
              "multiPv": 1
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "depth": 22,
              "fen": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
              "knodes": 13683,
              "pvs": [
                {
                  "cp": 27,
                  "moves": "e2e4 c7c5 g1f3 d7d6 d2d4 c5d4"
                }
              ]
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "additionalProperties": false,
                  "description": "Cloud-eval request: FEN position to analyze plus options.",
                  "properties": {
                    "fen": {
                      "description": "Standard FEN position string, e.g. 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1'",
                      "maxLength": 100,
                      "minLength": 15,
                      "type": "string"
                    },
                    "multiPv": {
                      "description": "Number of principal variations to return (1-5). Default 1.",
                      "maximum": 5,
                      "minimum": 1,
                      "type": "integer"
                    },
                    "variant": {
                      "description": "Chess variant. Default 'standard'.",
                      "enum": [
                        "standard",
                        "chess960",
                        "crazyhouse",
                        "antichess",
                        "atomic",
                        "horde",
                        "kingOfTheHill",
                        "racingKings",
                        "threeCheck"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "fen"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "$schema": "https://json-schema.org/draft/2020-12/schema",
                  "additionalProperties": {},
                  "description": "Cloud-eval response: depth, knodes, and principal variations.",
                  "properties": {
                    "depth": {
                      "description": "Search depth in plies.",
                      "maximum": 9007199254740991,
                      "minimum": -9007199254740991,
                      "type": "integer"
                    },
                    "fen": {
                      "description": "Echoed FEN that was evaluated.",
                      "type": "string"
                    },
                    "knodes": {
                      "description": "Kilonodes searched.",
                      "maximum": 9007199254740991,
                      "minimum": -9007199254740991,
                      "type": "integer"
                    },
                    "pvs": {
                      "description": "Principal variations (one per multiPv).",
                      "items": {
                        "additionalProperties": {},
                        "properties": {
                          "cp": {
                            "description": "Evaluation in centipawns from the side-to-move POV.",
                            "maximum": 9007199254740991,
                            "minimum": -9007199254740991,
                            "type": "integer"
                          },
                          "mate": {
                            "description": "Mate-in-N from the side-to-move POV, when applicable.",
                            "maximum": 9007199254740991,
                            "minimum": -9007199254740991,
                            "type": "integer"
                          },
                          "moves": {
                            "description": "Space-separated UCI moves of the principal variation.",
                            "type": "string"
                          }
                        },
                        "required": [
                          "moves"
                        ],
                        "type": "object"
                      },
                      "type": "array"
                    }
                  },
                  "required": [
                    "fen",
                    "pvs"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-21T21:52:06.166Z",
    "quality": {
      "l30DaysTotalCalls": 4,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-21T21:52:06.023Z"
    },
    "resource": "https://chess402.vercel.app/api/cloud-eval",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Stockfish cloud evaluation for a FEN position. Returns depth, evaluation, and principal variation(s) when Lichess has the position cached."
}

What the leaf hashes

{"body":"b2ed6cb719ce75cf8386f2fdfcba25b125ea4068326b1ac5c0274ae942f22202","id":72315,"kind":"listing","method":"baseline/1","observed_us":1793025485626692,"prev":null,"subject":"x402_bazaar:https://chess402.vercel.app/api/cloud-eval","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x8a026108be2370353981526927371da6e64a891ff93ea2598e6ac66cc40fa68f
2. 0xa28dc96e16db58b521cef59cd9b4a5c1f1e59b50b0b2b0dded521d4feacb3177
3. 0xe01dbb7d9ce8a3d1369ffc8f998c97e309dfbf47666d6b96cda68345868b3617
4. 0x528558d6dbb9cc1110cbeb344888e30d82b4d434825ef0dc91032d73c018dd3e
5. 0x41190b8cb05d3b9fb7a0e78cce407c48da3098ea1798488fdfebf476f0fe8dc1
6. 0x43a87d98811ebf1f45984f5934ef62422d9a58682f74086596ed64ed93a700d8
7. 0x2a31bd7cd75e0ec90d0ab12089cc35a5ff28859d81958757d94c029b2cbec1a7
8. 0xa818d11afdf992b3a5b953c6e93feb5384bcf52df39f9cfe1a70dec7a97849b9
9. 0x16a8d158894a82f2fc451dc7156839c348df5d7d90157f09f86aff0f1aedd62b
10. 0x982630687ce64555ae64a26aec05bb57bc8d6dbc7f1a3b6335e749ef24ab7401
11. 0x231f490acbb86d1ac0f80fbb2d49e85abc0ff9c6392ca16679f2cdf49b2863ac
12. 0x8cb11bf3bc7d3a6f859c170a167821024ffc4758cdfd2cc96f61a3291aefb637
13. 0xd5ec7ffaecac790d8adfa0620b0a5494758f862e3090b49e556a6ecbad2f0782
14. 0x78ac2b34737774659a6a411f4d10b8ba570d40699d9f277321c3a32ff03d1dc9
15. 0x7eb603d37f0f22dae1ea013e391889906ffc0139ff26e25b044bee38eec8f9b2
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae