Evidence row 72298

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://checkdigit.openverbs.com/v1/isbn"
    ]
  ],
  "name": "ISBN check",
  "owner_address": "0xb3f4de103f34b99f0da19b4f16d6b53a14c2194a",
  "raw": {
    "accepts": [
      {
        "amount": "2000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb3f4de103F34b99f0Da19B4F16D6B53a14C2194A",
        "scheme": "exact"
      }
    ],
    "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.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "isbn": "9780306406157"
            },
            "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": {
                    "isbn": {
                      "description": "ISBN-10 or ISBN-13 (spaces/hyphens allowed).",
                      "maxLength": 32,
                      "minLength": 1,
                      "type": "string"
                    }
                  },
                  "required": [
                    "isbn"
                  ],
                  "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": "2026-10-08T05:39:58.491Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-08T05:39:58.23Z"
    },
    "resource": "https://checkdigit.openverbs.com/v1/isbn",
    "serviceName": "ISBN check",
    "tags": [
      "isbn validation",
      "validate isbn",
      "isbn check digit",
      "isbn 10 isbn 13",
      "book number lookup"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "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."
}

What the leaf hashes

{"body":"58fd911daede903bdead9bd102a9253e713cba8780a11186c117d70d87ffe95c","id":72298,"kind":"listing","method":"baseline/1","observed_us":1793025485609396,"prev":null,"subject":"x402_bazaar:https://checkdigit.openverbs.com/v1/isbn","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. 0xe6d4f92b8d76db5d9532e10c6d9c174998908143a4f298277f7e4fd5f1170453
2. 0xef078c49b9afe89db890f051cf4fbd3b0709e27efecf016ec558c1b2656a4f06
3. 0xf280416ef9f916fec68ac3debcd07c17dc3ec7b8bb590cd07b15d5c654aa7675
4. 0x66902eccd0c49167d614a9dbd42263a625ea02904d040417eb7ec9919616c310
5. 0xa4e9c9b5de088dc56facc66573637748411f199e9ea49739182e18c73d76bd3c
6. 0x2b5169d80848bd91468291423c6da6d2a78ba763f6172d6a3195395e6c23b56d
7. 0x65befb2aad07caa59fcdb3c0910d70e68e4dbf3db6c4c26ef119f3e9ed7a65a9
8. 0x00876d163c1fb568ada7c0ba10c4f1b606f8761cbfcaf42ffe05a4607af8334d
9. 0xc2132949183ee3f0a7b9210540fb37203ac7278b97c4a53d262f91d3eea4956a
10. 0x3233c3265058bb5a7e34ed1f4aeeed146adeaf8dd695c350fb002bf738e335da
11. 0x59e039ae04bb13d1c4f6760e5371456ed0590ed6a27668ea3df8a519b5fd4655
12. 0xb866b513dd861c870688f5d1a8e434b170eaa2fafb0961d6a674d452b8e58381
13. 0xafcc1fe54cfe00a3a1de33df127340075f22433bb89848bbc81499cd7aca5b2b
14. 0x9bc5fc98278b9f6dc18c66c6e162aefd5244be03170d41bc5161f58ad11beed7
15. 0x95657a7d540ed6cac0bde9995782333b2562a9a6641853269ac95148827410f0
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae