Evidence row 2201657

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://linear-algebra.x402tookit.com/matrix-multiply"
    ]
  ],
  "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": "Multiply two matrices (up to 10x10) given as JSON, with shape check and the product matrix.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "A": "[[1,2],[3,4]]",
              "B": "[[5,6],[7,8]]"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T00:51:55.983Z",
              "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": [
                "exactness: 64-bit floating point, so very large or very different magnitudes round",
                "that multiplication order is the one you intended (AB differs from BA)"
              ],
              "product": [
                [
                  19,
                  22
                ],
                [
                  43,
                  50
                ]
              ],
              "reasons": [
                "Entry (i,j) is the sum over t of A[i][t] * B[t][j]."
              ],
              "shape": [
                2,
                2
              ],
              "source": "computed locally",
              "square": true,
              "summary": "A (2x2) times B (2x2) is a 2x2 matrix.",
              "verdict": "PRODUCT_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": "Left matrix, JSON like [[1,2],[3,4]] or 1,2;3,4 (max 10x10)",
                      "type": "string"
                    },
                    "B": {
                      "description": "Right matrix, same formats; rows of B must equal columns of A",
                      "type": "string"
                    }
                  },
                  "required": [
                    "A",
                    "B"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "product": {
                      "items": {
                        "items": {
                          "type": "number"
                        },
                        "type": "array"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "shape": {
                      "items": {
                        "type": "number"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "square": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:34:07.693Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:34:07.507Z"
    },
    "resource": "https://linear-algebra.x402tookit.com/matrix-multiply",
    "serviceName": "Linear Algebra",
    "tags": [
      "matrix",
      "multiply",
      "linear-algebra"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Multiply two matrices (up to 10x10) given as JSON, with shape check and the product matrix."
}

What the leaf hashes

{"body":"726c66d601aac8dbef3674fe916d1d5b835664f7f9e67c132f0ac676db6cff22","id":2201657,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646807762711,"prev":null,"subject":"x402_bazaar:https://linear-algebra.x402tookit.com/matrix-multiply","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. 0x119b87a8aba153a93ee913cefcad759cb031a8df7fd04e21d5823f7cb38f2dda
2. 0x507b60491a8a1f91070613054318cb227aab504ab829a31dbc47bb3daeffbc85
3. 0xeba361d18f831a96ad3918e14567fe87d93f59564bfe9c62854a9069c991ef72
4. 0x91259ec035f299f78a11db120885b5cbf01c458956432f46d807591fe2feffe0
5. 0x936330057bf60fac9b47bc4b9c1c7c6f846fa6e3f9caad8dc559cd0598f0494f
6. 0xcb811d860c71980bfc7a5abd3dfb4a5dbe24405dd6eeaa8a24b087fc6e5e2180
7. 0xf02333d64e97f0844423acbab7c5b7e28a765282b2934fe8fbfbd1bd7764991a
8. 0x325b26b7dc43c7406e4e04831fbf38e75187559b81d96b08a3b304708e00d90c
9. 0x040f5ee0a8ab5dadc37679bd0c442d7e9af9736c89c55ee7315b26550568fabb
10. 0xdc5b49040e4d8c91ff4008ef569509c8baa967e76ecd771b6c700584022ddcfa
11. 0xc43c1c013f5e56c337f5efc978b1280f7f7d3af4fc0124b095e1d338003f2da2
12. 0x74e0d631b606ef854cf5ee37e8a4af7452fcdd0b8dce7d3646c83926c6ab1fd5
13. 0x51686476d83f4be87192f4eeb7ac78473591bfaf5a92a1822648fcb019a95a83
14. 0x9914dfe331775bd1714304f757d2b6b43ba45167245d645ce50f54a3d8617c4d
15. 0xd82979c12a2aae44121bb6058b3364b3a3cbc9be411e35ab0208df5ed56f65d4
16. 0x7cb861d18f06406535ade133f716d897f27d257cf0121f99d94c78c713c4b54d
17. 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af