Evidence row 121949

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://stat.halowerk.com/v1/oss-openblas-low-rank-matrix-compress"
    ]
  ],
  "name": "stat.halowerk.com/v1/oss-openblas-low-rank-matrix-compress",
  "owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
  "raw": {
    "accepts": [
      {
        "amount": "2000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "asset": "USDC",
          "assetTransferMethod": "eip3009",
          "eip712Domain": {
            "chainId": 8453,
            "name": "USD Coin",
            "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "version": "2"
          },
          "name": "USD Coin",
          "network_name": "Base Mainnet",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "scheme": "exact"
      }
    ],
    "description": "Factors a matrix into rank-k left and right factors with their singular values, optionally centering the columns first, and states what the compression actually cost: the Frobenius reconstruction error against the input and the fraction of spectral energy retained. The full spectrum comes back too, so a caller can pick a different k without a second call. With centering enabled this is principal component analysis, and the column means are returned as part of the model.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "center_columns": false,
              "matrix": [
                [
                  3,
                  0
                ],
                [
                  0,
                  2
                ],
                [
                  0,
                  0
                ]
              ],
              "rank": 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": {
                    "center_columns": {
                      "type": "boolean"
                    },
                    "matrix": {
                      "items": {
                        "items": {
                          "maximum": 1000000,
                          "minimum": -1000000,
                          "type": "number"
                        },
                        "maxItems": 128,
                        "minItems": 1,
                        "type": "array"
                      },
                      "maxItems": 128,
                      "minItems": 1,
                      "type": "array"
                    },
                    "rank": {
                      "maximum": 128,
                      "minimum": 1,
                      "type": "integer"
                    }
                  },
                  "required": [
                    "matrix",
                    "rank",
                    "center_columns"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-23T07:35:47.197Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-23T07:35:46.788Z"
    },
    "resource": "https://stat.halowerk.com/v1/oss-openblas-low-rank-matrix-compress",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Factors a matrix into rank-k left and right factors with their singular values, optionally centering the columns first, and states what the compression actually cost: the Frobenius reconstruction error against the input and the fraction of spectral energy retained. The full spectrum comes back too, so a caller can pick a different k without a second call. With centering enabled this is principal component analysis, and the column means are returned as part of the model."
}

What the leaf hashes

{"body":"d5fcad6c309d73dabe7e8d7daa89058cd1555cca013ad530d893d989d1c31106","id":121949,"kind":"listing","method":"baseline/1","observed_us":1793025620704848,"prev":null,"subject":"x402_bazaar:https://stat.halowerk.com/v1/oss-openblas-low-rank-matrix-compress","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. 0x979c4ff63f1d8e7c62359d84fe2a1ec6cacd1a726d13058a379dd76ce5a2d413
2. 0xda429fd5cb5c4ed60b029acc61ae1054d796e893d4faf91e70ea7153ee0c7e93
3. 0x72f73c05b0deb1691831e5634cc7741c78a364f49c0cadb8fe725ba650292503
4. 0xc0e737642b0122d0be345c187b2786a30a9a46fd9da7b21871320ac6e550b70e
5. 0xda9d436a928771dbe5ab534e11320c46e1042cc4e6961746feaaf4b09c414f92
6. 0x8614d4626601e6ac3962724b782a5a299d20fefded8308812df466523e6b524e
7. 0x11e9a8b034d46b4c23eb21afa00bcf784aa40dd9e59f53bccaa90839917a1ba7
8. 0x40b7c2673b98091438cd3320637276d1f67a35d60d164d74f41140f8efdf15b2
9. 0x35eac46db8483d69cfaaaac2bd48acc2c02f3fa969d9d79ef5005146dbe11c26
10. 0xdc53c89cce7091adf601946635a4d64062fe6855a2f46a4967374baab5240ceb
11. 0x33109041c3d120f5b9ce2c3270a8fc409acfab4e749a0ff42fa0744354f87c17
12. 0xd43b73151a0c2d9a61f2ae73ed148938b0e6b05c81197f7eebbf95dba38a7004
13. 0xb314422bc93e7f1c0b706c67f5fff96c5ddf74934bb2fe8ab6291ae016907e37
14. 0x49062da782c4f73855ddd5fdd51840749f928b5f17d1ce75ac50f2d829104e72
15. 0xf0bd63870f0bb378fa300bd33563050dcb7b3e02b44eb3ee550c1c534ec4b246
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae