Evidence row 3959869

What was observed

{
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    ],
    [
      "x402",
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    ],
    [
      "x402",
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    ],
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    ],
    [
      "x402",
      "https://matrix.openverbs.com/v1/transpose"
    ]
  ],
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    "category": "",
    "description": "",
    "domain": "matrix.openverbs.com",
    "endpoints": [
      {
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        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
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            "example": [],
            "group": "body",
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        ],
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        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "1",
          "l30DaysUniquePayers": "1"
        },
        "serviceName": "Determinant",
        "tags": [
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          "square matrix determinant",
          "gaussian elimination determinant",
          "determinant api"
        ],
        "url": "https://matrix.openverbs.com/v1/determinant"
      },
      {
        "description": "Invert a square matrix via Gauss-Jordan elimination. A non-square, ragged or empty matrix is a clean 400. A singular (non-invertible) matrix is NOT an error — it returns a successful { invertible:false, inverse:null }.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
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        "quality": null,
        "serviceName": "Invert a matrix",
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          "inverse matrix api",
          "gauss jordan inverse",
          "check matrix invertible"
        ],
        "url": "https://matrix.openverbs.com/v1/inverse"
      },
      {
        "description": "Multiply two matrices A·B. The inner dimensions must agree (columns of A equal rows of B); a mismatch or a ragged/empty matrix is a clean 400.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
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        },
        "providerName": "",
        "quality": null,
        "serviceName": "Multiply matrices",
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          "matrix multiplication",
          "multiply matrices",
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          "matrix product api",
          "compute a dot b"
        ],
        "url": "https://matrix.openverbs.com/v1/multiply"
      },
      {
        "description": "Solve the linear system A·x = b for a square coefficient matrix A and vector b via Gaussian elimination with partial pivoting. A non-square A or a b of the wrong length is a clean 400. A singular system is NOT an error — it returns a successful { solvable:false, solution:null }.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
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          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
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        },
        "providerName": "",
        "quality": null,
        "serviceName": "Solve a linear system",
        "tags": [
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          "gaussian elimination solver",
          "solve coefficients vector"
        ],
        "url": "https://matrix.openverbs.com/v1/solve"
      },
      {
        "description": "Transpose a matrix, swapping rows and columns. A ragged/empty matrix is a clean 400.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": [],
            "group": "body",
            "name": "matrix",
            "required": false,
            "type": "array"
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        ],
        "pricing": {
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          "network": "eip155:8453",
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        },
        "providerName": "",
        "quality": null,
        "serviceName": "Transpose a matrix",
        "tags": [
          "transpose matrix",
          "swap matrix rows columns",
          "matrix transpose api",
          "flip matrix axes",
          "convert rows to columns"
        ],
        "url": "https://matrix.openverbs.com/v1/transpose"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "matrix-openverbs-com",
    "integrationType": "",
    "isNew": false,
    "name": "matrix.openverbs.com",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
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      "currency": "USDC",
      "maxAmount": "0.004",
      "minAmount": "0.004"
    },
    "provider": "matrix.openverbs.com",
    "providerUrl": "",
    "serviceName": "",
    "tags": [
      "matrix determinant",
      "compute determinant",
      "square matrix determinant",
      "gaussian elimination determinant",
      "determinant api",
      "matrix inverse",
      "invert matrix",
      "inverse matrix api",
      "gauss jordan inverse",
      "check matrix invertible",
      "matrix multiplication",
      "multiply matrices",
      "linear algebra multiply",
      "matrix product api",
      "compute a dot b",
      "solve linear system",
      "linear equation solver",
      "matrix solve ax b",
      "gaussian elimination solver",
      "solve coefficients vector",
      "transpose matrix",
      "swap matrix rows columns",
      "matrix transpose api",
      "flip matrix axes",
      "convert rows to columns"
    ]
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"1220c1fc663d6c0cab70e5611dd08e5cd8e7a4cff58e035bbf6fb0a2d0ef16a8","id":3959869,"kind":"listing","method":"sync.agentic_market/1","observed_us":1794076228531785,"prev":1784800,"subject":"agentic_market:matrix-openverbs-com","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. 0x396ce8b6ec39a39624646cd9524fe28bc2784b2c65590f2b2e13762157da9a69
2. 0x3da5dbca153360035caf8159418e0794739c4a5863baad72e1e6bdfcf0b78183
3. 0x4dadff0f0e36a5667c15dd88b97898c55a0ab93fbc21c2e142fa2fd72bc682d0
4. 0x51a3281c708858b8ef45a14063d25c423b7f4c2bac5aac8ac0170ca41f711394
5. 0xc272a8cd27a5d42e7d230b9778cb221badb281f6f0b95558311ea42954c0bb46
6. 0x897745d22a61ab325c3e873694fcf0262e3b7f15b6255a348900a12a38debf96
7. 0x815be55b150096c48b95444319391a97433ebe58f737f5bddcd1b65b1e5bf555
8. 0x58898c62625f1e5d1a495a51e0d15e3c03abd47dc3fd657a69e343045e317c22
9. 0xa94b59c43892b7ed060e7b97a79ca6df84e9835fd8baf08747c6b044d0e3f69b
10. 0xb9c621cd96c6691baf613fddc3ed698b9d3c935e61136f96150a748a33df3a36
11. 0x50a2d44f43f23e49c3c96e1a210d4ce2649d647e31013e5d21ea51db9efd9fa6
12. 0xe0fd6bdad452f0929ca722fcfc903c57c119d36e84b77b4829114206f3d84327
13. 0xc6da265da8cd33013b85c9c3406fb7cb01a279b8af0bdd0dc0fbf3e7907dc964
14. 0xb96cde31376f2620034d37eacb768d6239f6799d719ac01516ef133c0df4dda5
15. 0xa3ca92229f3aac0e9b561aaa066ca1907adc3f0b1685587fa30369d41cf66004
16. 0xf0a56561418cd0342a328707933cc222d8fa725efff7ffd081e0226ee8c46c0b
17. 0x54292a94f447f1fd33c01b5c99da465043f11022958626a2ea562c457fef697a
18. 0xff23fa8a9de3f957315ef0dfe7e8d8f6b1a51dae05fef7615c59794e019ff05c

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa