Evidence row 72304

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://checksum.openverbs.com/v1/crc16"
    ]
  ],
  "name": "CRC-16 (multiple variants)",
  "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": "CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "data": "example",
              "encoding": "utf8",
              "variant": "ccitt-false"
            },
            "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": {
                    "data": {
                      "description": "Input payload.",
                      "maxLength": 5000000,
                      "type": "string"
                    },
                    "encoding": {
                      "description": "How to decode `data`. Default utf8.",
                      "enum": [
                        "utf8",
                        "hex",
                        "base64"
                      ],
                      "type": "string"
                    },
                    "variant": {
                      "description": "CRC-16 variant. Default ccitt-false.",
                      "enum": [
                        "ccitt-false",
                        "xmodem",
                        "modbus",
                        "ibm"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "data"
                  ],
                  "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": "2026-10-05T13:12:59.425Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-05T13:12:59.287Z"
    },
    "resource": "https://checksum.openverbs.com/v1/crc16",
    "serviceName": "CRC-16 (multiple variants)",
    "tags": [
      "crc16 checksum",
      "calculate crc16",
      "crc16 variants",
      "ccitt crc lookup",
      "modbus crc"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "CRC-16 over the input payload in one of several standard variants (ccitt-false, xmodem, modbus, ibm; default ccitt-false). Returns the checksum as an unsigned integer and 4-digit hex. Non-cryptographic."
}

What the leaf hashes

{"body":"e97d8d92f5ab296e684abcb445a3d35e37c56a1b7ff6eb5211a1a41c389a9798","id":72304,"kind":"listing","method":"baseline/1","observed_us":1793025485614992,"prev":null,"subject":"x402_bazaar:https://checksum.openverbs.com/v1/crc16","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. 0xc3dd64c55512480866e143fb59b1a2f744e6abba8b4a33c7bcc06367a4d066e5
2. 0x67a3d8fe40892ba6749f098779f9e95f94fa6adcb53404f671b97110f87bd3d3
3. 0x7bd507141b01958e265e2e51a25150d2dee142ec1aad0dda06f38b26e7cdd70f
4. 0x28f373b805b1a219db815addea2bdcf4558535163cdbd93cee786c0930731d74
5. 0xec47f9fd18b5464b5990c4388e9e7fc83ad331a6032212598afc18c8c083f15b
6. 0x5724165ad36c8b00a6bc30f5c0c7c9aff6c806c37b7326015c2bd7be5b44ac6b
7. 0xbec0bed09760a89e7b6fe6992afa9b0f29cf69d061b178445b5ac3aefe15d6fd
8. 0xb8bf7c23459e1f8b7b6222ab88f28da78e210fadd2505a7bd8f43be95beaeaae
9. 0x96af53cab0b6484baa5b5de03c539cb87a76d8f71b3a639a422035419c9fbaf3
10. 0xdc850e305944c852a3843d2749ca3439ee04fdbf864b6a8660cc3fd8b5aced96
11. 0x2cd92a66ffb802d7ebc327d20fe07925be80289ee1c2910e6818dc40c67f2487
12. 0x63002f2569d43725bbf2d04d90ec9e6cf925c96b6dda5e7e220ecfbdd9c2444d
13. 0x641fba1f23ec69d96721e34ace1926954d835b9614cb5eae215a069c056399b8
14. 0xdbe2e8dd65ea1248b2936612538f18268abd5cf27ebdab3737694571ad496004
15. 0x9f68b5e15459cb62b8c0cd4c124fa61c74147b4a5755a200fbecd21a581635d1
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae