Evidence row 1792094

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": 2,
      "l30DaysUniquePayers": 2,
      "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":"621e16168136fa1c581b9cd3cbbfb8ef7232d2cda84b4a8237a5c44f3a445f0c","id":1792094,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793560007664211,"prev":116731,"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 2026-11-01 (302406 rows).

1. 0x7278d941e68f23ed967456b85d332a4e597ba0097e43e2142599aa77d1a07208
2. 0x715d704b633c3adfa46c4fafee98d7d84dd6fa497a1adae716779c5dce2f6dae
3. 0x49132ab45dbca49358b81b624b80c753c8e2f5a5a9d1663c2a16cd96164afd85
4. 0x1b4e839b253fb97b6bda7be300351d059b74890f949cd026be47ad6c5ab5bfda
5. 0xdc84148f01da063fea616372126d00679a0122dfc5df6ae2416df1f723ad0c03
6. 0x8e0a75d2ca9637bf4ebcc6a08c6ff32f930532718621e180670b2c0de14003d9
7. 0xb7a10c07bbae262f7ec0ca4bee9e2d11a0a0c4c6b8225f38866335db637b4e43
8. 0xecc0c0685c0032cd897c59eea99d21c14c986297d074428528aed24dc2d24412
9. 0x1ab1316f8e9123846dddbe396cfa2c59018717cb706303beb6400f99986a0370
10. 0x3745860491ab1706c63cc44a3dcaacc3b6c7a3a522db8c081a6ad5b6a712aee1
11. 0x0fb846fc6cb3bb37a7325bc2c1e41cdb2d9db3e5f994723c7035a963564b3415
12. 0x9225199f9f9007724cfab30f8252870de214e3fa4464c9b48797718fda302667
13. 0xeed7e951b5e4701a6d9e1ccb44369bdaeb14efaf3655042a73f8487da4230bf1
14. 0x3c3408392402b125bd2c2cfb11c655ba3e5ef4f456caee26d4ee38a093e93c53
15. 0x614dbc600bca0766e288d2a5ebb7709ac565230ac6acdc88a5e4a7a5ff53c58e
16. 0xe329dbfb0db2c7f35334e66970a8ee37ee2d3356d34d692c10f84b6f7de65a35
17. 0x0c618c42b286ad61acd8204aa6dcf024b8b041d3759aa585bf4e221abc39cb5d
18. 0x6142ac48fda269c17791c79da99c2456ac6acfe98268f4d168a404fd6040c703
19. 0x3315fd2757fdd435852cc277377234a3f3909a6d2a089d0e36f6d59aacfda910

Day root

0x7fa2cba1cf3d6b35630896f5fe1a650adb307ea2c376e80a5f2d9276b7cb5ab3

Chained

0x577ff89ba012beeff3197bcff7fa86752074bdf54205a24359cc437be2a952a4

Published

On Arc Testnet, block 70262758: 0x435bc1b9331471d72e1998f2e420983b5189d4da65ffbd6f27ef40daf5e1ea90