Evidence row 119537

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/chess/puzzle"
    ]
  ],
  "name": "Saylor Innovations Chess",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:chess:puzzle",
          "name": "USD Coin",
          "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
          "memo": "saylor:chess:puzzle",
          "reference": "7esKENFbULe9TdNtVi1Z3pK5HyZ621xJmuzpCBQJJBBk",
          "session": "eyJhcnRpY2xlSWQiOiJjaGVzczpwdXp6bGUiLCJyZWZlcmVuY2UiOiI3ZXNLRU5GYlVMZTlUZE50VmkxWjNwSzVIeVo2MjF4Sm11enBDQlFKSkJCayIsInJlY2lwaWVudCI6IjdMU2pmckpmOGZOc0I4VkE5dTdOM1dFbjI1c21RTHBvYjNTdnlVdlhhY3k3IiwibWludCI6IkVQakZXZGQ1QXVmcVNTcWVNMnFOMXh6eWJhcEM4RzR3RUdHa1p3eVREdDF2IiwibWluQW1vdW50IjoxMDAwMCwiZXhwIjoxNzkyMTE1NDA4MTk0fQ.p_xRYsyM84pmwT5hVsa_BioF9PxWUNfS5j3IYi9mtb4"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "Lichess daily chess puzzle - FEN position, rating, themes and UCI solution moves",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "fen": "rnb2rk1/ppp1pp1p/5np1/4b3/2P5/3BB3/PP3PPP/R2NK1NR w KQ - 1 1",
              "found": true,
              "id": "9862H",
              "rating": 2011,
              "side_to_move": "white",
              "solution_uci": [
                "f2f4",
                "e5d6"
              ],
              "themes": [
                "opening",
                "advantage"
              ],
              "url": "https://lichess.org/training/9862H"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "POST",
                    "PUT",
                    "PATCH",
                    "DELETE",
                    "HEAD"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "fen": {
                      "description": "Board position in FEN notation",
                      "type": "string"
                    },
                    "found": {
                      "description": "True when the lookup matched a record",
                      "type": "boolean"
                    },
                    "game": {},
                    "id": {
                      "description": "Identifier of the record",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "rating": {
                      "description": "Rating",
                      "type": "number"
                    },
                    "side_to_move": {
                      "description": "Side to move",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "solution_uci": {
                      "description": "Solution uci",
                      "items": {
                        "type": "string"
                      },
                      "type": "array"
                    },
                    "source": {
                      "description": "Data source the values come from",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "themes": {
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "url": {
                      "description": "Canonical URL",
                      "type": [
                        "string",
                        "null"
                      ]
                    }
                  },
                  "required": [
                    "found"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1790235422/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-16T01:48:08.246Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-16T01:48:08.004Z"
    },
    "resource": "https://saylorinnovations.com/api/chess/puzzle",
    "serviceName": "Saylor Innovations Chess",
    "tags": [
      "chess",
      "puzzle",
      "lichess",
      "stockfish"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Lichess daily chess puzzle - FEN position, rating, themes and UCI solution moves"
}

What the leaf hashes

{"body":"46786f72bcd54cc79e0db44f6e8db5d5a13c843ac5144f190bda1a701d14744d","id":119537,"kind":"listing","method":"baseline/1","observed_us":1793025615785523,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/chess/puzzle","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. 0xad507f2b63f08bdf452eb249803bcd6d1910287370e3ae95bb1a25f646b99e2a
2. 0x92e09207233dfb920ec52278709bfabdf0d9d188cb8ed104a9d2a7d141c93459
3. 0x8d3fb3aa6637b03dbe10d9710cc64a58b367ccb1f60e6ea3720c19e37e8ad9e0
4. 0x05c544828b31b35602cc2e39c8faf148bc82087b2c12760d84b598c87f21b301
5. 0x01c093ef9bf313b268edce267c286c79890ccd940b737d7d4e3cd88dc095a587
6. 0xa4410ce8f97df6942c189a5846a31047fbd300386bd3639da77c1c724ba50d87
7. 0x8bc0c58892d6b27e8d9d9cd1d115faeae235e0d0d95bcdc8ac22469236b6ff95
8. 0xdd2b02d6f0ea8b0a0c019acf51ec4389f8e1f4461c371d8ccf1171266d3a25e3
9. 0xbbbcdb2a68b371a0b7b0af22f935a0deedf517e33fcff3c1e319aa53090c36c0
10. 0x69f5e36901c930d3d90499bc3b7d9e7644e48cf4f26d1ebf8d605ee5e9424913
11. 0x317c51a47b234292d19f812377ad1cc4d05ded07987c4ea1ac9ae1ad2b20f0d2
12. 0x51f06c175a7c946ebe50ef243d6f9370a8fe85c996e53eff19ffcc4585ea8c18
13. 0xe292b5a99219f136bce6647ce74b21240a1c7331d2475b1839220fd363c94217
14. 0x3b4dba7d874fc323b0a364140a9c60f37bf547fe671897653118a9873fe03420
15. 0x1a74ed3b3756b9cd946da49701bcec120ec88645013da99fa9eea60b39e1a570
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae