Evidence row 2201652

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://linear-algebra.x402tookit.com/vector-ops"
    ]
  ],
  "name": "Linear Algebra",
  "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": "Vector dot, cross, norm, angle, projection, unit vector and distance for vectors of up to 100 entries.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "a": "[1,2,3]",
              "b": "[4,5,6]",
              "op": "cross"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T00:51:57.300Z",
              "degraded": false,
              "dimension": 3,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "magnitude": 7.34846922835,
              "notChecked": [
                "exact arithmetic: 64-bit floating point",
                "units or coordinate frames (the numbers are treated as plain Cartesian components)",
                "…1 more"
              ],
              "op": "cross",
              "parallel": false,
              "reasons": [
                "Right-handed cross product, perpendicular to both inputs.",
                "Its length is the area of the parallelogram the vectors span; zero means parallel."
              ],
              "result": [
                -3,
                6
              ],
              "source": "computed locally",
              "summary": "Cross product (-3, 6, -3); parallelogram area 7.34846922835.",
              "verdict": "CROSS_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": {
                    "a": {
                      "description": "First vector, JSON like [1,2,3] or 1,2,3",
                      "type": "string"
                    },
                    "b": {
                      "description": "Second vector, same length; required for every op except norm and unit",
                      "type": "string"
                    },
                    "op": {
                      "description": "One of dot, cross, norm, angle, projection, unit, distance",
                      "type": "string"
                    }
                  },
                  "required": [
                    "op",
                    "a"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "dimension": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "magnitude": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "op": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "parallel": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "result": {
                      "items": {
                        "type": "number"
                      },
                      "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": "2026-11-01T23:34:21.858Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:34:21.676Z"
    },
    "resource": "https://linear-algebra.x402tookit.com/vector-ops",
    "serviceName": "Linear Algebra",
    "tags": [
      "vector",
      "dot-product",
      "cross-product",
      "angle",
      "projection"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Vector dot, cross, norm, angle, projection, unit vector and distance for vectors of up to 100 entries."
}

What the leaf hashes

{"body":"6fa6d9751439cbc89369a9cbc5cfeff9ae4e4907f93d745b9b8dc10c521dbdb6","id":2201652,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646807712419,"prev":null,"subject":"x402_bazaar:https://linear-algebra.x402tookit.com/vector-ops","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. 0x3d86a451a4cac901aaeb6dec1b1ec6a6c4ed3c1aa2efd19997627e6a59f2de25
2. 0x0c1a28041c1b56c805ff5c692909b763c2caacf5553a85560a1c821a40c16725
3. 0x3a3b37e8118dab406cef060af732c3b758642f1661ee40d772796e0047bf9a69
4. 0xb8509070d4926cb99574a95c938c116d17c1c7c4246b97eb632b138b94fb7780
5. 0xb60823a134286bc7b9ae3bf7e104f0af35d7baceffe57fa1f0d6c56845f22335
6. 0x858bef0b42bdbeb39341ea44423b37b0244302b94e29d54ac25ff582189950ae
7. 0xa5e416d993ef66a71ac2fc9581e89070996c9b670690841e95edcd582465b4cb
8. 0x4c8cf34ae12454d104dc8ab4dc780c5e0c656acbda361668d03fdb11b769ab55
9. 0x8d9fb0099e3f4bca423c93119aa11006f7aa5b235c9895e9a1d84a4b7680a492
10. 0x67c3901a320204462f297576a623147387a8402b47fc0a0fc66f021286813223
11. 0x2be848cb86d72c2e582fe1d0a7c67c075a60e3819be24b46432581c3db979e93
12. 0xb1c944b99390ba5175965090f5362380c7485dc911c281e22b9c18263ec8c4ed
13. 0x361907c755dedca0a2adf05840c4c503b2c9a3af060e2659c8c63c2a1e438de2
14. 0x2205fefa1140121f3fe567e386a9612e8f7236f2a6b4c18d07e5fc4d08bd90e5
15. 0x8448bd1fe3c2d48b62a118ace4a5cb82fee53586dd43d776c2526ad844398919
16. 0x8760c227928c5295506cd8606e763f86cf8cd2a549820fab4dc86d29ca0d816d
17. 0xa20b9be86af7d690e040c9060a373b2fc5498edf3432f43c26f74fa2febc1e9a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af