Evidence row 3067

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://app.difficat.com/api/v1/screenshots"
    ]
  ],
  "name": "DiffiCat",
  "owner_address": "0x91805ccdcb0af529ffa510efc494786f19d4c257",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x91805ccDcB0aF529FFa510Efc494786f19d4c257",
        "scheme": "exact"
      }
    ],
    "description": "Captures a full-page screenshot of one public web page in Chromium and returns a link to the PNG. Use it for a one-off visual check of a page, or to keep a reference image before a change. 0.02 USD per call.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "url": "https://difficat.com",
              "viewportWidth": 1280
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "dimensions": {
                "height": 2400,
                "width": 1280
              },
              "filename": "difficat-com.png",
              "jobId": "web-1a2b3c",
              "jobToken": "shown-once",
              "links": {
                "file": "/api/v1/jobs/web-1a2b3c/files/difficat-com.png"
              },
              "payment": {
                "amount": "0.02",
                "currency": "USD"
              },
              "url": "https://difficat.com"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "auth": {
                      "properties": {
                        "password": {
                          "description": "Password for HTTP basic auth.",
                          "type": "string"
                        },
                        "username": {
                          "description": "Username for HTTP basic auth.",
                          "type": "string"
                        }
                      },
                      "required": [
                        "username",
                        "password"
                      ],
                      "type": "object"
                    },
                    "url": {
                      "format": "uri",
                      "maxLength": 2048,
                      "type": "string"
                    },
                    "viewportWidth": {
                      "maximum": 2560,
                      "minimum": 320,
                      "type": "integer"
                    },
                    "visual": {
                      "additionalProperties": false,
                      "description": "Capture rules applied to both sides.",
                      "properties": {
                        "freeze": {
                          "additionalProperties": false,
                          "properties": {
                            "animations": {
                              "description": "Stop CSS animations and transitions before the screenshot.",
                              "type": "boolean"
                            },
                            "clock": {
                              "description": "Pause timers and the clock after load; a page that needs a timer to render may stay empty.",
                              "type": "boolean"
                            },
                            "clockSeconds": {
                              "type": "integer"
                            }
                          },
                          "type": "object"
                        },
                        "masks": {
                          "description": "CSS selectors of elements hidden on both sites before the screenshot (at most 50, each up to 200 characters). The layout keeps its place.",
                          "items": {
                            "maxLength": 200,
                            "minLength": 1,
                            "type": "string"
                          },
                          "maxItems": 50,
                          "type": "array"
                        }
                      },
                      "type": "object"
                    }
                  },
                  "required": [
                    "url"
                  ],
                  "type": "object"
                },
                "bodyType": {
                  "enum": [
                    "json"
                  ],
                  "type": "string"
                },
                "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"
        }
      },
      "mppx": {
        "info": {
          "_mppx_scope": "difficat:screenshot:0.02",
          "method": "POST",
          "opaque": "eyJfbXBweF9zY29wZSI6ImRpZmZpY2F0OnNjcmVlbnNob3Q6MC4wMiIsImFtb3VudCI6IjAuMDIiLCJraW5kIjoic2NyZWVuc2hvdCJ9"
        },
        "schema": {
          "additionalProperties": false,
          "properties": {
            "_mppx_scope": {
              "type": "string"
            },
            "digest": {
              "type": "string"
            },
            "method": {
              "type": "string"
            },
            "nonce": {
              "type": "string"
            },
            "opaque": {
              "type": "string"
            }
          },
          "required": [
            "method"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-23T22:28:54.053Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-23T22:28:53.399Z"
    },
    "resource": "https://app.difficat.com/api/v1/screenshots",
    "serviceName": "DiffiCat",
    "tags": [
      "screenshot",
      "visual-regression",
      "web"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Captures a full-page screenshot of one public web page in Chromium and returns a link to the PNG. Use it for a one-off visual check of a page, or to keep a reference image before a change. 0.02 USD per call."
}

What the leaf hashes

{"body":"85ef7065cb113862a30d40edea63f54004922f08cbd9c04804fa63292529b1d9","id":3067,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025269212584,"prev":null,"subject":"x402_bazaar:https://app.difficat.com/api/v1/screenshots","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. 0x1f734d4e126ae911617fa08cb024b9d805be80ff76f2354e9a47da0abf70ed28
2. 0xd15fcde8eb55b3254a22c43e14299397bd4dc45c3eac3db4f80a47d2cbe58d7a
3. 0x4c2341bf7474bbd205d1c9afb6cc68573e3fc32d4d30c398e6e9d5560d2b4dc5
4. 0x996ae9855495ec62d297f23c45b339fd67a2f9a2a46c77cbc22ac3b31e4a7464
5. 0x10d729a103e7953ccddc582c3201a76e1ad5e352bed914e27e701762f710a0ae
6. 0x0d876ea25b8023a4fb3c190030eb14bab6db8bf5efea44dc13e3c533772d3825
7. 0x1cc6bc83d3f5f52ce0449d6136178425a386b656867f7d48eed76b9c8d209c74
8. 0xfde2b30ecbbe147ac6152148e71ce1a22f64471611462a0b2d8192c532c45d7c
9. 0x40d2f539386cb41d47f2fb6582b8c51cafc4c2d23e692c1ee01aa3eee6a3d77c
10. 0x95d4f13dc77f1ba3eb78d20352c758152498641438c50e44cef664ea99f9747c
11. 0xbfd7c325ad90588d62856113d1c0ad99de5d67958ff0f672c892809fd668fffe
12. 0xbd94b9d1458901cf513783d5d2bc701e3babbcdf9219e07ee2be8fb2c897060f
13. 0x42b0d9d5b53af5b0fe99cee10ce29fe484db78b92ce49f97190cc6d098651d47
14. 0x9dfd312f3d4937f7cb144cee3987e8516f222932b4ea286605236d73cfa1ed16
15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae