Evidence row 3767486

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://stats.openverbs.com/v1/correlation"
    ]
  ],
  "name": "Pearson correlation",
  "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": "Pearson correlation coefficient and covariance of two equal-length paired series. Rejected as a clean 400 if the lengths differ or either series has zero variance (correlation undefined).",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "x": [
                1,
                2,
                3
              ],
              "y": [
                2,
                4,
                6
              ]
            },
            "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": {
                    "x": {
                      "description": "First series.",
                      "items": {
                        "type": "number"
                      },
                      "maxItems": 100000,
                      "minItems": 2,
                      "type": "array"
                    },
                    "y": {
                      "description": "Second series (same length as x).",
                      "items": {
                        "type": "number"
                      },
                      "maxItems": 100000,
                      "minItems": 2,
                      "type": "array"
                    }
                  },
                  "required": [
                    "x",
                    "y"
                  ],
                  "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": "2026-10-08T05:38:33.483Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-08T05:38:33.231Z"
    },
    "resource": "https://stats.openverbs.com/v1/correlation",
    "serviceName": "Pearson correlation",
    "tags": [
      "pearson correlation",
      "correlation coefficient",
      "calculate covariance",
      "paired series correlation",
      "linear relationship stats"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Pearson correlation coefficient and covariance of two equal-length paired series. Rejected as a clean 400 if the lengths differ or either series has zero variance (correlation undefined)."
}

What the leaf hashes

{"body":"1aa56341b2c5197e239f5663f8662fd4359413a7e3da63054d31579c221ad9e5","id":3767486,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793996787653012,"prev":122005,"subject":"x402_bazaar:https://stats.openverbs.com/v1/correlation","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-06 (303443 rows).

1. 0x351a80f5f45bd20f30f912e60aecf708b6a04c8a583a0d23db8127306414df71
2. 0x41fa2a2e4f825314ed625243181445845e83c569533ce9cc390162fa061ee2ea
3. 0x354a6854fcd1113fa267053eb5f9bf7e4c4d0e5ef677f3e9a573ea7afdc95fef
4. 0xb55f0aa9872f8d74abba4b5a2670898dc964949d9083296e5f6d37e182f7b2fb
5. 0x8d11d7caedcd25eb902a092acaf3670c860d1aa017c5a167fd5c196e6e9823f2
6. 0xd350d5032c5a10d07e683def7b6c515ad3ede0d0db019cf43bd0a2b0dfc7bdf3
7. 0x5c1d16e297bcb0e208c463ce0be9053d1419621c6fee6fee01092f9d74be25d1
8. 0x914ea1b98f7d0698d03dda9a4686113a0a0e863bbb2689e3c0a99c165a7c7d33
9. 0x566dafbc812cea4433026a27bb5f637fa13c692de6e6b04aca353218813d3e97
10. 0x6347f888608f840396c12c280359448e450a11ff1a38d84d3130f8227a24349b
11. 0x2dbccff9541c4cc72157219ff72943cf3b36311e4517052015d60a816c50d19c
12. 0x244fec37753a07c0df178965d0d989c60410c7b169fe1c8c0fe74d61594fe8c4
13. 0x52cf06947a94d5a4b713e0e82aa23a8280a6e1b32cf171dbcf7aac1f874bf8e8
14. 0xe7e7f0ee694b712db7150c3f1692ed383efbc9783ba8600081ffac0da359b4ef
15. 0xaa85d31529f47e1b810e9dfd8bfa6050b99090fde56ac1fa1fb399ad1e6bb919
16. 0x0aaf291a2ffa2205e7df7531bf36800e377dfbd67208da05b97625f1cc49ce02
17. 0xa448dc698494f795f2240c0e7070e8a93eb263baee21ca4185a7d03432a614d8
18. 0x119743aadcddb571b28b442b62196d4a0afc4e1c9979c2d477d34fcc9413deaf
19. 0xc0d08d48601d1be90bcfc025e66bcaa0030120d688dd9c919b36c2c4446f4948

Day root

0xb30ccefe7182c6f767e1fcbfb5f64ffd649da831f665f65c5ff39cd40512284f

Chained

0xc383f7ef68d2914082484765aa09e42c12c59a74a096ae64127c562618c506d3

Published

On Arc Testnet, block 71111178: 0xfba13cb7ee4ada7f2fee3702a786a2201596be2ffea37dfc281ab4c8e9942fe1