Evidence row 117790

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://otp.openverbs.com/v1/hotp"
    ]
  ],
  "name": "HOTP (counter-based)",
  "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": "Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "algorithm": "SHA1",
              "counter": 1,
              "digits": 6,
              "secret": "example"
            },
            "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": {
                    "algorithm": {
                      "description": "HMAC algorithm. Default SHA1.",
                      "enum": [
                        "SHA1",
                        "SHA256",
                        "SHA512"
                      ],
                      "type": "string"
                    },
                    "counter": {
                      "description": "The HOTP counter value.",
                      "minimum": 0,
                      "type": "integer"
                    },
                    "digits": {
                      "description": "Number of code digits. Default 6.",
                      "maximum": 10,
                      "minimum": 6,
                      "type": "integer"
                    },
                    "secret": {
                      "description": "Base32-encoded shared secret.",
                      "maxLength": 1024,
                      "minLength": 1,
                      "type": "string"
                    }
                  },
                  "required": [
                    "secret",
                    "counter"
                  ],
                  "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": "2026-10-05T12:11:02.31Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-05T12:11:02.042Z"
    },
    "resource": "https://otp.openverbs.com/v1/hotp",
    "serviceName": "HOTP (counter-based)",
    "tags": [
      "hotp api",
      "generate hotp",
      "counter based otp",
      "hmac one time password",
      "rfc 4226 code"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Generate an RFC 4226 counter-based HMAC one-time password from a base32 secret and counter. Configurable digits (6–10, default 6) and algorithm (SHA1/SHA256/SHA512, default SHA1). An invalid base32 secret is a clean 400."
}

What the leaf hashes

{"body":"28e4a3021c73bcb78ecc6162ec187784002a569d5cab8f808d0d20ba17e7404c","id":117790,"kind":"listing","method":"baseline/1","observed_us":1793025611897241,"prev":null,"subject":"x402_bazaar:https://otp.openverbs.com/v1/hotp","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. 0xddfa50d7423a25baebfb223060fa3b38eaf7c50ec01b5858c1d3299e0197bb68
2. 0xb6e7e56ab4db1f3eeffde77cd99a046a9334496f2bd4ba5a6b2e50491e50dbc4
3. 0xbedf64d70e374a8140d421208b2f69e0506997c96ca1e634dc9798f74fbf4744
4. 0x4b39a44cb6e8f9b8530d91ab9985926e6fcbdb240e83a025806a2a4043da8bd8
5. 0x4530ed4b677055dbc75100e36b55a92fa20c57ad0eab61c5b7267616dd903143
6. 0xc3725022d818a1b7aa55e9829d39186455385c92af3dd24cd8ca12ae2d482dbe
7. 0x7002090db235518a30bb3c63624db12bf3897e7b4a7caf206f534d404f90d245
8. 0x60fa66dcbed68c01514df5266bc7d81f3165808d6413ebfd6b2da94209c9aa05
9. 0x06f96ed1299c4f82ca8b50b2ed57aa679aa495512c7ba87c96ba1b0d9fe04930
10. 0x12eb4e2b4ed9f7c86f939062c1dfe240b4ae07c2838ab2862752d9d227307515
11. 0x85202061e6a75f8df085f0bff56604cbc8349d53f71525ea3c173296a57488dc
12. 0xd5d3f9a510ef9bc1156a86fc24b9d0c3a67b96d7c1dad1563f35f879e0ac9b4b
13. 0xa4edde833302b48399053e2519aea1aed1074cd102bf4b553643df1866cce4ec
14. 0x0b7541c75cc482a7134110311d7dbd02095d969ba21177de9b21a52a55981718
15. 0x6dc40f983a3840a0ad927a9ca17f4ff1e3b649a6c735e2a09b140db7c2caf13b
16. 0x703f95866af09c5e5d6ead7411e9a10f964a41a2aff64d4a55ff0053c023a023
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae