Evidence row 76210

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://hash.openverbs.com/v1/hmac"
    ]
  ],
  "name": "HMAC data",
  "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": "Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, etc.) and API requests. Data and key may each be utf8/hex/base64/base64url; the tag is returned as hex/base64/base64url.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "algorithm": "sha256",
              "data": "example",
              "inputEncoding": "utf8",
              "key": "example",
              "keyEncoding": "utf8"
            },
            "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": "Digest algorithm, one of sha256, sha512, sha384, sha224, sha1, sha3-256, sha3-384, sha3-512, md5, ripemd160, blake2b512, blake2s256.",
                      "enum": [
                        "sha256",
                        "sha512",
                        "sha384",
                        "sha224",
                        "sha1",
                        "sha3-256",
                        "sha3-384",
                        "sha3-512",
                        "md5",
                        "ripemd160",
                        "blake2b512",
                        "blake2s256"
                      ],
                      "type": "string"
                    },
                    "data": {
                      "description": "The data to authenticate, in `inputEncoding`.",
                      "maxLength": 5000000,
                      "type": "string"
                    },
                    "inputEncoding": {
                      "description": "How to interpret the text as bytes (utf8, hex, base64, base64url). Default utf8.",
                      "enum": [
                        "utf8",
                        "hex",
                        "base64",
                        "base64url"
                      ],
                      "type": "string"
                    },
                    "key": {
                      "description": "The secret key, in `keyEncoding`.",
                      "maxLength": 16384,
                      "minLength": 1,
                      "type": "string"
                    },
                    "keyEncoding": {
                      "description": "How to interpret the key as bytes (utf8, hex, base64, base64url). Default utf8.",
                      "enum": [
                        "utf8",
                        "hex",
                        "base64",
                        "base64url"
                      ],
                      "type": "string"
                    },
                    "outputEncoding": {
                      "description": "How to render the digest (hex, base64, base64url). Default hex.",
                      "enum": [
                        "hex",
                        "base64",
                        "base64url"
                      ],
                      "type": "string"
                    }
                  },
                  "required": [
                    "data",
                    "key",
                    "algorithm"
                  ],
                  "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": "2026-10-05T13:55:51.632Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-05T13:55:51.324Z"
    },
    "resource": "https://hash.openverbs.com/v1/hmac",
    "serviceName": "HMAC data",
    "tags": [
      "hmac signature",
      "sign webhook payload",
      "verify webhook hmac",
      "keyed hash api",
      "hmac sha256"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Compute a keyed HMAC of some data with a secret key — the standard way to sign and verify webhooks (Stripe, GitHub, etc.) and API requests. Data and key may each be utf8/hex/base64/base64url; the tag is returned as hex/base64/base64url."
}

What the leaf hashes

{"body":"b71b4516082036a85988ee022e9075da1b970038f2239df324c07e10155ce291","id":76210,"kind":"listing","method":"baseline/1","observed_us":1793025491789693,"prev":null,"subject":"x402_bazaar:https://hash.openverbs.com/v1/hmac","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. 0xb474e99788da2276c3754890902987ac3272be4bcd8bd27bb0f79b1e5d9db8f0
2. 0xa555a98f84d4ebaf2a2803ffeabaf62a847ae0f1a2d102e3290aede5c59ce877
3. 0xb5dfbb83701d72dfb7d5bd3aa84cd4e8ef12b8ea32bbcfcb82dd31e1be27c117
4. 0x84d143d6b35df8173f3b9867650f4531e23320d227ba99b926169dbab50a2e79
5. 0x9a62d4050502d23c2c09a20625e8231898165548fd4f1f077959f1fb5fd66001
6. 0x5a6a1f6cf4935d6be233874d4b91dae2379804ee3255f0f5ea1611de17c45608
7. 0x70267783f8d820cfcd58234a025318123c7677795d6d40309bdd9ca82473ffc2
8. 0xd1f1e7cc6f4930d46e1794c819e7e4fb0d948fe77b85713ac834fd309857e9b8
9. 0x0d86ea4a4da1f9a834855a683934629d570af3b3857f8164865f1166025658aa
10. 0xf941bb922f242f0d5ded32ad8f4624a0ca45bdb31fdd68caca25d77699da15d9
11. 0x559555135675e39701c05a4d63d274b59d60cf1dc8421a68215c770867d00aff
12. 0x7a0f1751de1946feff7d8c8afc737dcc4d35f110809c15aa0fdb8363a9e31b2b
13. 0x0d86419ca1dd0b62fd8b22ea2e8c74d441312cec3116a467bea429b43e026565
14. 0x083427e39db4dd470662401f6db5db8fadf084fc4274cf8621b368416952b78b
15. 0x1a74ed3b3756b9cd946da49701bcec120ec88645013da99fa9eea60b39e1a570
16. 0x123ec8bee20ddc55223eeef5a4f4d6c4b6416515adbb911c56759f5cde56e452
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae