Evidence row 3970381

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": 1,
      "l30DaysUniquePayers": 1,
      "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":"7680f0594410b3fe61967e7fd509bb7badabd71478ba62e0a16b518a3d66e5ab","id":3970381,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1794083637233715,"prev":1792094,"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 2026-11-07 (195826 rows).

1. 0xe447c187278d0faa2dff5c1ecda2034b21eb8c470bd1b967e8e56ed938702851
2. 0x0d402d78ef31cbe60315fab12c28931c3a127b64d26541784b65f7aa0d084016
3. 0x740629e5b1e9c97014472943628a539b85138e96b51fbbedaea4bf7e6c170ede
4. 0xc3978bbe041546e1fd7807aeb64780fe0bd1c41b03ddc1b584d67030a974d841
5. 0x68bc5dc16b390859e307ad7eef859f0abeab3a042b7826614d5b57082da831fa
6. 0xfcc87d529d8ce933f0c34dbef84385711b3098148e2a6ed567a96710653a083f
7. 0x68da61125dde41faca7e6c92c4e0d20f36b1671a7f3a24df5055f9470cf99005
8. 0xb9569ffea814832c08748bf5b1ea04ba4fb7249ff971c3c8588f14842f153a14
9. 0x50a007b67295c8138bcab176679f96445b3fd6f6c7bfdd625207d5aa5a7d999b
10. 0x4199d372a4749169fae5103bf9d9ae4b21d9ad167fd89e218b2fd06fe729eeb3
11. 0xd97356666d4edf5918ea131b48ef15a5dc5ff591958195f5740d548d903d781b
12. 0xf3a39b7f14b5af2b25f91d2696803cda92796e9aac24e32d005eb6e1b9134f96
13. 0x43264bd26116ef8e6f9fb17235da20d71d20e9b50e11d5352edde08d4a1d0f55
14. 0x6f49c61b0121647381a6cf39821f3b65b9e708380eb6ac63924f415c4db07607
15. 0xe840e410ee5ca60b9428cf31ac97ed84879fffbdab20af854208e002351d4fae
16. 0xbb3be27e5da5ccad91ce4674c6eac53275c0832f3885b89533d2be65d38f2fc6
17. 0x9ea7c2ecc6985da4b761b0f9096b7858b3ac8e3e47717c3840537fb2ff31c6df

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa