Evidence row 1845

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/ean"
    ],
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/imei"
    ],
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/isbn"
    ],
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/luhn"
    ],
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/routing"
    ]
  ],
  "name": "checkdigit.openverbs.com",
  "owner_address": null,
  "raw": {
    "caip2_networks": [
      "eip155:8453"
    ],
    "category": "",
    "description": "",
    "domain": "checkdigit.openverbs.com",
    "endpoints": [
      {
        "description": "Validate a GTIN barcode number — EAN-8, UPC-A (12), EAN-13 or GTIN-14 — by the standard mod-10 check digit. Length selects the scheme.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "4006381333931",
            "group": "body",
            "name": "number",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "EAN / UPC / GTIN check",
        "tags": [
          "gtin validation",
          "validate barcode number",
          "ean upc check digit",
          "upc validation",
          "ean 13 checksum"
        ],
        "url": "https://checkdigit.openverbs.com/v1/ean"
      },
      {
        "description": "Validate a 15-digit mobile device IMEI by its Luhn check digit. Spaces and hyphens are ignored.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "490154203237518",
            "group": "body",
            "name": "imei",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "IMEI check",
        "tags": [
          "imei validation",
          "validate imei number",
          "mobile device imei",
          "imei check digit",
          "imei luhn check"
        ],
        "url": "https://checkdigit.openverbs.com/v1/imei"
      },
      {
        "description": "Validate an ISBN-10 (mod-11, trailing X allowed) or ISBN-13 (GTIN mod-10) book number. Length after removing spaces/hyphens selects the scheme.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "9780306406157",
            "group": "body",
            "name": "isbn",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "ISBN check",
        "tags": [
          "isbn validation",
          "validate isbn",
          "isbn check digit",
          "isbn 10 isbn 13",
          "book number lookup"
        ],
        "url": "https://checkdigit.openverbs.com/v1/isbn"
      },
      {
        "description": "Validate a number by the Luhn (mod-10) algorithm — the scheme behind credit/debit card numbers and many IDs. Spaces and hyphens are ignored. A mismatched check digit is a successful { valid: false }.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "4111111111111111",
            "group": "body",
            "name": "number",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "Luhn check",
        "tags": [
          "luhn validation",
          "validate credit card number",
          "mod 10 check digit",
          "luhn checksum api",
          "check card number"
        ],
        "url": "https://checkdigit.openverbs.com/v1/luhn"
      },
      {
        "description": "Validate a 9-digit US ABA bank routing number by its weighted (3,7,1) mod-10 checksum. Spaces and hyphens are ignored.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "021000021",
            "group": "body",
            "name": "routingNumber",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.002",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "2",
          "l30DaysUniquePayers": "2"
        },
        "serviceName": "ABA routing check",
        "tags": [
          "aba routing validation",
          "validate routing number",
          "bank routing checksum",
          "us routing number lookup",
          "aba check digit"
        ],
        "url": "https://checkdigit.openverbs.com/v1/routing"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "checkdigit-openverbs-com",
    "integrationType": "",
    "isNew": false,
    "name": "checkdigit.openverbs.com",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
      "avgCostPerTransaction": "0.002",
      "currency": "USDC",
      "maxAmount": "0.002",
      "minAmount": "0.002"
    },
    "provider": "checkdigit.openverbs.com",
    "providerUrl": "",
    "serviceName": "",
    "tags": [
      "gtin validation",
      "validate barcode number",
      "ean upc check digit",
      "upc validation",
      "ean 13 checksum",
      "imei validation",
      "validate imei number",
      "mobile device imei",
      "imei check digit",
      "imei luhn check",
      "isbn validation",
      "validate isbn",
      "isbn check digit",
      "isbn 10 isbn 13",
      "book number lookup",
      "luhn validation",
      "validate credit card number",
      "mod 10 check digit",
      "luhn checksum api",
      "check card number",
      "aba routing validation",
      "validate routing number",
      "bank routing checksum",
      "us routing number lookup",
      "aba check digit"
    ]
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"bb27eda4bd22556106afa0175ef9d324a664db6d0634f6275c8ef5aee1c9a1e7","id":1845,"kind":"listing","method":"baseline/1","observed_us":1793025259429014,"prev":null,"subject":"agentic_market:checkdigit-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 2026-10-26 (296695 rows).

1. 0xff54400e831f24bc8b800a53924d2c6778b3dc41014425d81a4cac2ef2c8ce43
2. 0x420bfecc6bc575e3b2a7234142e4cf9f3c0b40aaeda544cb7a29e457f38c11a6
3. 0xf9eac44c521f8814c998d1136ba3d1466cbf05e820512f3a972f59d7403920d1
4. 0x3ff1e749d77a90e60490c82f98b6360d69a0ebbdcdf79649563e528f4bf46cc4
5. 0xe97e5620c4669b2c9a2ffaf07b6781ab658919f8929f31b4f1a44b2f309522aa
6. 0xbdf219754989dfa0d1b8b8dae5ecc5c77194a65778124d0d9c795c94f5c2db38
7. 0x60f2536ba28e81c837ddc786e820ddf87501a175e6b0cd26b4ce80a4b76ced9e
8. 0x3f12a06dcd9f4c84bdae85a9d0f90be0c8ccf3b1d75a66ce69bb44724fb6bfbe
9. 0xfc83ee4738c633e4c5c1f727c601153a2afb21d524ceb83f6e84b881a41b3d93
10. 0x301cb2348a778b944d1bff0de6fa4d710487d6a5b6fb61608bd9e3d5df1f098a
11. 0xf0e3125fdb80cc0fbd2c1ed68c94834a74c7a387a89a1ab6de49183f24f78649
12. 0xbd264414f726ecec85a6b231446a7d5db56b5a61f8c3f471b7913d982daa291d
13. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae