Evidence row 2201659

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://linear-algebra.x402tookit.com/inverse"
    ]
  ],
  "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": "Inverse of a square matrix (up to 10x10) by Gauss-Jordan, with A*inv(A) residual and a condition number.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "A": "[[4,7],[2,6]]"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-12T00:51:55.457Z",
              "conditionNumber1Norm": 14.3,
              "degraded": false,
              "digitsLostEstimate": 1,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "illConditioned": false,
              "inverse": [
                [
                  0.6,
                  -0.7
                ],
                [
                  -0.2,
                  0.4
                ]
              ],
              "maxResidualAAinvMinusI": 2.22e-16,
              "notChecked": [
                "exact arithmetic: for an ill-conditioned matrix the printed digits beyond the condition number's reach are noise",
                "sensitivity of the inverse to errors in your own input data"
              ],
              "reasons": [
                "Gauss-Jordan elimination with partial pivoting.",
                "The condition number is ||A||_1 * ||inv(A)||_1 using the computed inverse. About 1 of the ~16 digits of a double can be lost.",
                "…1 more"
              ],
              "singular": false,
              "source": "computed locally",
              "summary": "Inverse found; 1-norm condition number about 14.3.",
              "verdict": "INVERTIBLE"
            },
            "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": "Square matrix, JSON like [[4,7],[2,6]] or 4,7;2,6 (max 10x10)",
                      "type": "string"
                    }
                  },
                  "required": [
                    "A"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "conditionNumber1Norm": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "digitsLostEstimate": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "illConditioned": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "inverse": {
                      "items": {
                        "items": {
                          "type": "number"
                        },
                        "type": "array"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "maxResidualAAinvMinusI": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "singular": {
                      "type": [
                        "boolean",
                        "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": "2026-11-01T23:34:02.045Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:34:01.767Z"
    },
    "resource": "https://linear-algebra.x402tookit.com/inverse",
    "serviceName": "Linear Algebra",
    "tags": [
      "inverse",
      "matrix",
      "condition-number",
      "linear-algebra"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Inverse of a square matrix (up to 10x10) by Gauss-Jordan, with A*inv(A) residual and a condition number."
}

What the leaf hashes

{"body":"b4e44d14b58b42d0b36386de8265e6c8e07769370a918db5424361a081bd59fe","id":2201659,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646807769569,"prev":null,"subject":"x402_bazaar:https://linear-algebra.x402tookit.com/inverse","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. 0x8d88c6551edfc8783f211e12886899736112003a0cf4b2f4c470008a475318d6
2. 0x46cf9b0df82e5b2517891a65b143c6ec6486c4f4e1df84f05ddc13699c7e5c9a
3. 0x71f0918ebfc63f9994b885252ef4f7a83be67e3f8af605467b5770310b8e1882
4. 0x210a894b7b00692de060d10cd444b959383c0c96424655b1624eac962500d63c
5. 0x80b6dfd2152358b92747794bc3cdd31195fe7c86455befa3b8af611c408200f1
6. 0x53c22aa6b030842f3dad213951038075e3b0a46bba2a96cc32c6f8ff6b7410bd
7. 0xae89ff6297a95c42291cc24f960c8b98b65346198da5a0282e45a7e70af47cc2
8. 0xdd637d067eae19c5e6c530495381416cf62f41c598b05878f3a60538c99d27c3
9. 0x633c85223f79d003480354de5e5f0f332da7c6eccc4510402c44e9778cf4a89c
10. 0x87c0d79447711e30d0b7f9b024d72ef89e209f1a2bff3d4d704faf289546801a
11. 0x11cb0fbcd290c8507a8128d0a17a422bc27efef8f46b56034ee30cb10f5327f4
12. 0xb030bb42b9eab986acc0da3e948c6aadf4547c06744cd7db6bb54c446df9b380
13. 0x8e26ae8a6fa3c6baea1cd4108668ed189b835a519376f35f53b7ea9cc4800a95
14. 0x3f15e4f2fd3ab4091e7284edf8bfed23163b8ef6b0c8fdbd458a498a9bb35a32
15. 0x5d92631d189bd0292c27a05f85a5ec38ec5f4197dfe4660eb991dc6a511e25a6
16. 0x5e23ec5954c11a4530aab8c635a72b12bcfeb6fcb03c6cb1a990cc1743424543
17. 0x1805ef693fbdb2c23fcb61616f830408ca89bec1dc5b68ee47a770ffc0b9760a
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af