Evidence row 76795

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://iot.halowerk.com/v1/device-auth"
    ]
  ],
  "name": "iotwerk_device_auth",
  "owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
  "raw": {
    "accepts": [
      {
        "amount": "2000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "asset": "USDC",
          "assetTransferMethod": "eip3009",
          "eip712Domain": {
            "chainId": 8453,
            "name": "USD Coin",
            "verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
            "version": "2"
          },
          "name": "USD Coin",
          "network_name": "Base Mainnet",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "recipient": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
        "scheme": "exact"
      }
    ],
    "description": "Canonicalizes device_id, nonce and message, computes an HMAC-SHA256 tag with caller-supplied ephemeral key material, and optionally compares a claimed tag in constant time. It does not provision devices, store keys or replace asymmetric device identity; do not submit long-lived production secrets.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "bodyType": "json",
            "exampleUrl": "https://iot.halowerk.com/v1/device-auth/schema#/requestExample",
            "method": "POST",
            "schemaUrl": "https://iot.halowerk.com/v1/device-auth/schema#/inputSchema",
            "type": "http"
          },
          "output": {
            "example": {
              "challenge_sha256": "18bc9813c9e7eada747dded26e0f2345367cc77db04c8c4bab52a1e9c0f92c9f",
              "claimed_tag_matches": null,
              "device_id": "sensor-berlin-17",
              "method": "HMAC-SHA256 tag verification over a canonical device challenge",
              "tag_hex": "e0fe0e124f142e26c9ee890cd6e121b55993a4cf0f6df4ed325066c962e2ae05"
            },
            "exampleUrl": "https://iot.halowerk.com/v1/device-auth/schema#/outputExample",
            "schemaUrl": "https://iot.halowerk.com/v1/device-auth/schema#/outputSchema",
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "additionalProperties": true,
          "properties": {
            "input": {
              "additionalProperties": true,
              "properties": {
                "bodyType": {
                  "const": "json"
                },
                "exampleUrl": {
                  "format": "uri",
                  "type": "string"
                },
                "method": {
                  "const": "POST"
                },
                "schemaUrl": {
                  "format": "uri",
                  "type": "string"
                },
                "type": {
                  "const": "http"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType"
              ],
              "type": "object"
            },
            "output": {
              "additionalProperties": true,
              "properties": {
                "exampleUrl": {
                  "format": "uri",
                  "type": "string"
                },
                "schemaUrl": {
                  "format": "uri",
                  "type": "string"
                },
                "type": {
                  "const": "json"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-26T00:13:44.535Z",
    "quality": {
      "l30DaysTotalCalls": 18,
      "l30DaysUniquePayers": 7,
      "lastCalledAt": "2026-10-26T00:13:44.341Z"
    },
    "resource": "https://iot.halowerk.com/v1/device-auth",
    "serviceName": "iotwerk_device_auth",
    "tags": [
      "iot",
      "security",
      "hmac"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Canonicalizes device_id, nonce and message, computes an HMAC-SHA256 tag with caller-supplied ephemeral key material, and optionally compares a claimed tag in constant time. It does not provision devices, store keys or replace asymmetric device identity; do not submit long-lived production secrets."
}

What the leaf hashes

{"body":"c84a2d272654130ac988326dcd9942724752b907ecebf455e30eda3744bcd5dc","id":76795,"kind":"listing","method":"baseline/1","observed_us":1793025492949487,"prev":null,"subject":"x402_bazaar:https://iot.halowerk.com/v1/device-auth","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. 0x35644f0c9fbb5879c941d336712ea6068ab00d9c6b67e3deaf8a79ba604319df
2. 0x04d13e0701cd912a2c5fe2258375f5343b217b086d17a42a66f32b9bdcedc33b
3. 0xd4e810be1904ddb20553127935b5fc2959347a2214046dcfb34bbea5265f7a17
4. 0x1ffc1eff50ae8c24b2501197f4d804c98be66b2fbd0765b51aa0efcc418370ba
5. 0x4a276ac9369375c32a423362688159d580803d7700ce0838cb9fc17c5cb5aa9b
6. 0xd70528349cbc6460acc52e2314be864027dc9ad6b6642654b61853b2e39689e1
7. 0x50af216de4659e8405f2a71db7b1398bf7db4dd1cf037854d3d4964715413012
8. 0x1bdd6bcf1bf36bfecf2b35e7ba9111db46af1942cc1a330ab1c327f8527a41ea
9. 0xfb1089ccd2c2414c0ea65d29400fbe3cb672be3d5cf77c4be9b86547eb864c9f
10. 0x36bec804120016062991795b06589946d6f9108ba9f84ace37bda5ef8cca7e6d
11. 0x30ae64b0356d2a2933965306373f46f4bf64268b5a265594ef3370f079c19d92
12. 0x992ab7416b80cd368936c788f743fd3ea4576a49e22c75ab0262abf692f8ed6c
13. 0xdfc7a920beab71e6882e75c57bf136a5354c4ea989a35108a69046bc62059090
14. 0x4338355a835617a26aa0bfcc971e84eb030d84e2aa840e3c8af958921dd080c7
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae