Evidence row 121241

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://sicher.halowerk.com/v1/log-chain-verify"
    ]
  ],
  "name": "sicher.halowerk.com/v1/log-chain-verify",
  "owner_address": "0x2880edfff13100677bf97a3cbdf3bc34771c4e5e",
  "raw": {
    "accepts": [
      {
        "amount": "5000",
        "asset": "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",
        "scheme": "exact"
      }
    ],
    "description": "Recomputes every record hash from a canonical JSON representation of id, sequence, timestamp, previous_hash and payload, then checks that each record points to the hash of the record before it. If a root_hash is supplied, the same computed record hashes are folded into a deterministic binary Merkle tree with the last leaf duplicated on odd levels.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "records": [
                {
                  "hash": "7f07223905bb01a5b3f2eda8a61c69280b6e75c938712afcb187bbf2a0d696c4",
                  "id": "evt-001",
                  "payload": {
                    "action": "created",
                    "actor": "build-bot",
                    "subject": "release-2026.08.19"
                  },
                  "previous_hash": null,
                  "sequence": 1,
                  "timestamp": "2026-08-19T09:00:00Z"
                },
                {
                  "hash": "4584b3d398d3dd075f43d61a2c44991c61d3183c22243582c367cdccb1af664c",
                  "id": "evt-002",
                  "payload": {
                    "action": "approved",
                    "actor": "release-manager",
                    "subject": "release-2026.08.19"
                  },
                  "previous_hash": "7f07223905bb01a5b3f2eda8a61c69280b6e75c938712afcb187bbf2a0d696c4",
                  "sequence": 2,
                  "timestamp": "2026-08-19T09:01:00Z"
                }
              ],
              "root_hash": "f6e5b0a2eeed0102fcdd3480a6f7a851bb55679f2d3c7e532df3780f46c1b426"
            },
            "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": {
                    "records": {
                      "description": "Audit records in chain order.",
                      "items": {
                        "additionalProperties": false,
                        "properties": {
                          "hash": {
                            "description": "Claimed SHA-256 hash of this record.",
                            "maxLength": 71,
                            "minLength": 64,
                            "type": "string"
                          },
                          "id": {
                            "description": "Stable event id.",
                            "maxLength": 160,
                            "minLength": 1,
                            "type": "string"
                          },
                          "payload": {
                            "description": "Event payload to include in the record hash."
                          },
                          "previous_hash": {
                            "anyOf": [
                              {
                                "maxLength": 71,
                                "minLength": 64,
                                "type": "string"
                              },
                              {
                                "type": "null"
                              }
                            ],
                            "description": "Hash of the previous record, or null for the first record."
                          },
                          "sequence": {
                            "description": "Monotonic event position.",
                            "maximum": 1000000000,
                            "minimum": 0,
                            "type": "integer"
                          },
                          "timestamp": {
                            "description": "Event time as supplied by the log producer.",
                            "maxLength": 80,
                            "minLength": 1,
                            "type": "string"
                          }
                        },
                        "required": [
                          "id",
                          "sequence",
                          "timestamp",
                          "previous_hash",
                          "payload",
                          "hash"
                        ],
                        "type": "object"
                      },
                      "maxItems": 500,
                      "minItems": 1,
                      "type": "array"
                    },
                    "require_monotonic_sequence": {
                      "default": true,
                      "description": "Require sequence numbers to increase by one.",
                      "type": "boolean"
                    },
                    "root_hash": {
                      "description": "Optional claimed Merkle root over the computed record hashes.",
                      "maxLength": 71,
                      "minLength": 64,
                      "type": "string"
                    }
                  },
                  "required": [
                    "records"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-08T05:40:41.759Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-08T05:40:41.286Z"
    },
    "resource": "https://sicher.halowerk.com/v1/log-chain-verify",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Recomputes every record hash from a canonical JSON representation of id, sequence, timestamp, previous_hash and payload, then checks that each record points to the hash of the record before it. If a root_hash is supplied, the same computed record hashes are folded into a deterministic binary Merkle tree with the last leaf duplicated on odd levels."
}

What the leaf hashes

{"body":"8e6a03dc844257769476905d4433d1fe52966cabf74ba092bfc4cad169fc3c7f","id":121241,"kind":"listing","method":"baseline/1","observed_us":1793025619663152,"prev":null,"subject":"x402_bazaar:https://sicher.halowerk.com/v1/log-chain-verify","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. 0x140fad77f880172e6bb2a21119d2993528596dbf22a7539e03e2ff5a270673ee
2. 0x899dc585d14d65f4cdbe854b23e9538b21321d298bcbb8aade4da47147d84c27
3. 0x79d5b7561f7b4e91d540d7b35b224062d358558acc00915e8437083662ebdbd0
4. 0x27522dadbeb69e243a8ca54b480814e644d73b6e999b55dfac82ecdb6743b929
5. 0x036573bd927c07f58c3118296142849277df0f4e59cfc898aa2f7efd6020e0ff
6. 0xf486dc67b95f42e39e1640f2a77c62bc528135f93163d013e12a0efc8373716d
7. 0x95b8cf9e0c656f8b8a4f80a0a6c254e0a75ac11e15bbab288dd9e725e16f1307
8. 0x185dd2d0c7c2f4f74f71f602f54ca0dc4d73da9146c7af61ddeee823b4901aa1
9. 0x4e317cb86cb5b99084d789e62de0cf483ec892c013146be3a9edf4e02b5a3928
10. 0x7db5a200b679db21ea2e6e1ef5754ab4e6e096c29c406025cdb376cb10cfb19e
11. 0xda5e2c2f0532a3bc2b2bc361905db44768a9ec088fd32d70f9333b7801b14b95
12. 0x2412cb8bc4d10d94e1eb907d5058dd12133e55416609e1b314e811af76620542
13. 0xff1c28bdf595a3d1333e9915edc68e9c5fded7bd5923fa85870979af34cbc3b3
14. 0xb49e8c2564256e5322e375cb619d9ac70fd17c1d1eba9c991bba4cb6428f45cc
15. 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae