Evidence row 121937

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://stampthisfile.com/v1/stamps"
    ]
  ],
  "name": "stampthisfile",
  "owner_address": "0x385881d9b1b8e11f840e0639139e314e64bc488a",
  "raw": {
    "accepts": [
      {
        "amount": "50000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x385881d9b1b8e11f840e0639139e314e64bc488a",
        "scheme": "exact"
      }
    ],
    "description": "Timestamp SHA-256 hashes in Bitcoin with OpenTimestamps: returns a standard .ots proof per hash (pending, complete within hours), verifiable without us",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "hashes": [
                "b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9"
              ]
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "batch_id": "bat_…",
              "stamps": [
                {
                  "hash": "b94d…cde9",
                  "id": "stp_…",
                  "ots": "<base64 .ots>",
                  "ots_url": "https://stampthisfile.com/v1/stamps/stp_….ots",
                  "status": "pending"
                }
              ]
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "hashes": {
                      "description": "Each hash costs the unit price; send each once",
                      "items": {
                        "description": "SHA-256 of the file, hex",
                        "pattern": "^[0-9a-fA-F]{64}$",
                        "type": "string"
                      },
                      "maxItems": 100,
                      "minItems": 1,
                      "type": "array"
                    },
                    "webhook": {
                      "properties": {
                        "signing_key": {
                          "description": "Optional Standard Webhooks secret (whsec_…) to also sign deliveries with HMAC (v1)",
                          "type": "string"
                        },
                        "url": {
                          "description": "https URL that receives stamps.completed / stamps.failed",
                          "format": "uri",
                          "type": "string"
                        }
                      },
                      "required": [
                        "url"
                      ],
                      "type": "object"
                    }
                  },
                  "required": [
                    "hashes"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ],
                  "type": "string"
                },
                "headers": {
                  "additionalProperties": {
                    "type": "string"
                  },
                  "type": "object"
                },
                "method": {
                  "enum": [
                    "POST"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1792529635/bazaar-icons/19fe92af849b00dd.png",
    "lastUpdated": "2026-10-21T11:19:24.707Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-21T11:19:24.376Z"
    },
    "resource": "https://stampthisfile.com/v1/stamps",
    "serviceName": "stampthisfile",
    "tags": [
      "timestamp",
      "opentimestamps",
      "bitcoin",
      "proof-of-existence",
      "hash"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Timestamp SHA-256 hashes in Bitcoin with OpenTimestamps: returns a standard .ots proof per hash (pending, complete within hours), verifiable without us"
}

What the leaf hashes

{"body":"5da2d19ecaf860fa6696cb173311b0b4e432839048203d3201c17acb2d66faa4","id":121937,"kind":"listing","method":"baseline/1","observed_us":1793025620690030,"prev":null,"subject":"x402_bazaar:https://stampthisfile.com/v1/stamps","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. 0x21ad8fc8b8908bdbe567b9f0cb919570698caf6ceeb5acc545838c9367aa2985
2. 0x564ec57a1f810281c705234c6f461fb06de0664d07aa231dbe2afaa1c8ebc8ce
3. 0x0116b12493c21ced2e146da71514834c8e89b113d3f974ddadb22c62f966bb48
4. 0xd6c75227dc9da9bc87fd3dda44ccc0113ddfd32ad0cc276e17006349689a9c03
5. 0x2bf219b075cc4f86c4aaf376ff7b43ef83c6d8df04a52f309027977cdcc2e872
6. 0x51fd0c73a6f27294ea0940ff8d71442a1897828773621600612c8ccf3cf60044
7. 0x52fbec7b6374a79be39fd8239fc9f7206a6237034fb81091abf77c5b1ac94aaf
8. 0xca3f36126ba8d729ee8456edd437764442c89c0b56de0483dbe83448183ae7d3
9. 0xe60bf97619ac6c7eb964e44d8f98480ae58bba8d1a2bae4d1f737d2e628354eb
10. 0x52a03554eda198dc4680d30e566c1eda71c25f02648bb3a67df331bf196cafc1
11. 0x71f472bb5c514dca2395c7842916e5cae63a9c622d8bc8f84b07a986c5ba91a1
12. 0xfde157310fc8513767b162378ca9ceefb2937c374b7381a8887f7ccba8ab5a80
13. 0x9d75d4d3ab6219edefa04be60b32fdd56be7a7672f370a5115f02f7b098ecd27
14. 0x9dfd312f3d4937f7cb144cee3987e8516f222932b4ea286605236d73cfa1ed16
15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae