Evidence row 116731

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://matrix.openverbs.com/v1/determinant"
    ]
  ],
  "name": "Determinant",
  "owner_address": "0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a",
  "raw": {
    "accepts": [
      {
        "amount": "4000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
        "scheme": "exact"
      }
    ],
    "description": "Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a singular matrix simply returns 0.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "matrix": [
                [
                  1
                ]
              ]
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "additionalProperties": false,
                  "properties": {
                    "matrix": {
                      "description": "Square matrix (n×n).",
                      "items": {
                        "items": {
                          "type": "number"
                        },
                        "minItems": 1,
                        "type": "array"
                      },
                      "minItems": 1,
                      "type": "array"
                    }
                  },
                  "required": [
                    "matrix"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-19T12:02:47.831Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-19T12:02:47.576Z"
    },
    "resource": "https://matrix.openverbs.com/v1/determinant",
    "serviceName": "Determinant",
    "tags": [
      "matrix determinant",
      "compute determinant",
      "square matrix determinant",
      "gaussian elimination determinant",
      "determinant api"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Compute the determinant of a square matrix via Gaussian elimination with partial pivoting. A non-square, ragged or empty matrix is a clean 400; a singular matrix simply returns 0."
}

What the leaf hashes

{"body":"4f657e7e54a61ffad84207c1cd5e2c9252407993d2cca8aaffbc34f025b73d15","id":116731,"kind":"listing","method":"baseline/1","observed_us":1793025610215981,"prev":null,"subject":"x402_bazaar:https://matrix.openverbs.com/v1/determinant","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. 0x8c0a32e97261e4c6cf00288a595194aa3b5fca37fb5adb39ceaae10c98d13b13
2. 0x7e1d63d6e9c78ebc5ad6315d3ae77010558e35888808d18f2bbe80f6236fe1e6
3. 0x90b9a389daf22afbeb2d0408a427002130781101207d9f23fc1d2170776d4d72
4. 0x9a570868f2b8a57196f1fd9438413cdc2bb62d2a7b2d4014c86749ccb429efb7
5. 0x7e7dc99e12bfa5c3a76dc465dd7164b7432e56e5995a2ed7f0baf7ba6e3439d0
6. 0x25d11def39e391950adc89e542b9c426573a42f8ee1fd6ecf56797a3c424f798
7. 0xcb438885a2684ae8a1b3e70d30d0a53f56aa940c046cee7ea5eeb10597e030cc
8. 0x5f457eded78c7573eac765a768904819ccea595b96d29d91ab51ade13a4ae339
9. 0xc72282c0b45ff3f519592065e737fbf899f9608fa2d1d8e93804eb5365037610
10. 0x6ddbfc11a7759e428ac6be29ebc89a10db0158bf96c5d141eb5c2695e3450573
11. 0xc0c39d9d8be0b7d600d3badab7754e326243b0d4eb60c4b5cd965d7d764d1d04
12. 0xfc86b2282cb8f91e68280efe01f3c50453c94fae2ef04af1a75d4b05d0af2b8f
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