Evidence row 407811

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": "2026-10-26T19:23:51.147Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-26T19:23:50.765Z"
    },
    "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":"1bacfd90f08cb1ab8cd383c80c043fa4f0498d478fb2faf28e278ddabc9e4b2e","id":407811,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793080252512685,"prev":297327,"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 2026-10-27 (273461 rows).

1. 0x4c95d93d3dfb3017d91beacd20fab70390cbe35ad58dcb738e035290bea68429
2. 0x6170f52dd830dae594f4e58765c3e7771659950c48d3db71978ff930d0cbbfb3
3. 0x39f0f85d630a2d9b2e8078816219be63fa6512ac93149789aed9d1ac7ef473ba
4. 0xef08f75adb5e6d868ddf6c0e984465c74b40b2eae5ee0223b6d628093413e6ac
5. 0x38a44ea00363cb76d917b8193e947c74fb1b4d41c36f88aee2de85865d5e1b70
6. 0xd11de47da62fbd067f9c1a686f67f5f28cbee96a332d3067e8a37c156e680d34
7. 0x9f11de75128aa019fb9f959bd02a1169bcc1f757f6f22e223c219127fb58b460
8. 0x2f6724c1bb7696e4f1c7eb04ba69d55bdb3bce1b8293d34d2fba862196a3ba32
9. 0x72f8839b69f44c5ef57872fa7c17041b46bd8cd48090352e2f8285f4fe42faf8
10. 0x009b28c470fea0379fb01500cff53ea88f28239be80c1afb103ed19aa50cb9e1
11. 0xdb79ef753f2bf12d42dd9582e7548d8779f526360e431c95865fd80eb157c47e
12. 0xf5ad7dee20c9ad48ff75cc443e6c6ae3a718321f07b826d581afdb243e59305f
13. 0x150dc531eedad3837a4be47dd0bf1a84bf98feb63216c125982425fda525a3fd
14. 0x80ede9e5d428e39db26928b1d08254ff1241f1d7e091fd2e57130fbb4423162b
15. 0x2c117b27721eea45f6590fbccb471d21a7b0b079a53f089ecb300c63bdb3aebf
16. 0x3ed50f053eca72dfd3a9d45a11935240bfe691e57835c367ddebe2cbc49efe9d
17. 0x0e01aa9525097570a6edaf32bfc959de57bf5c24317cf10c0716affea85ca60d
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4