Evidence row 3987735

What was observed

{
  "count": 6,
  "tools": [
    {
      "description": "Creates an unpaid order for the ready recipients in a saved list and the selected saved card design. Returns a cards.onmax.me link for the user to review recipients and pay. Nothing is printed, mailed or charged until the user pays on that page. Rows needing fixes are excluded. Each call creates a separate order link. An optional US sender address is printed as the return address.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "arrive_by": {
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          },
          "design_id": {
            "type": "string"
          },
          "list_id": {
            "type": "string"
          },
          "send_date": {
            "description": "Date to print and mail, YYYY-MM-DD.",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          },
          "sender": {
            "description": "Return address (US).",
            "properties": {
              "city": {
                "maxLength": 40,
                "type": "string"
              },
              "line1": {
                "maxLength": 64,
                "type": "string"
              },
              "line2": {
                "maxLength": 64,
                "type": "string"
              },
              "name": {
                "maxLength": 40,
                "type": "string"
              },
              "state": {
                "maxLength": 20,
                "type": "string"
              },
              "zip": {
                "maxLength": 10,
                "type": "string"
              }
            },
            "required": [
              "name",
              "line1",
              "city",
              "state",
              "zip"
            ],
            "type": "object"
          }
        },
        "required": [
          "list_id",
          "design_id"
        ],
        "type": "object"
      },
      "name": "create_mailing"
    },
    {
      "description": "Creates or edits a printed 5x7 postcard with a front greeting, optional photo, back message and sign-off. Downloads an attached photo or public HTTPS photo URL to cards.onmax.me. Without a photo, the greeting appears on a solid color. An existing design_id edits that design; omitted fields remain unchanged. The back message is user-written or user-approved text of up to 500 characters. Arranges supplied photos and text in a print template without generating images.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "design_id": {
            "type": "string"
          },
          "greeting": {
            "description": "Front headline, e.g. \"Happy Holidays\", \"Merry Christmas\", \"Thank You\".",
            "maxLength": 40,
            "minLength": 1,
            "type": "string"
          },
          "message": {
            "description": "Message printed on the back.",
            "maxLength": 500,
            "type": "string"
          },
          "photo": {
            "description": "Photo the user attached for the front.",
            "properties": {
              "download_url": {
                "type": "string"
              },
              "file_id": {
                "type": "string"
              },
              "file_name": {
                "type": "string"
              },
              "mime_type": {
                "type": "string"
              }
            },
            "required": [
              "download_url",
              "file_id"
            ],
            "type": "object"
          },
          "photo_url": {
            "description": "Public https URL of the front photo.",
            "format": "uri",
            "type": "string"
          },
          "remove_photo": {
            "type": "boolean"
          },
          "sign_off": {
            "description": "Signature on the back, e.g. \"Love, The Garcias\".",
            "maxLength": 80,
            "type": "string"
          },
          "style": {
            "description": "classic (red), evergreen (green), winter (blue), minimal (white), thanks (warm, for thank-you cards).",
            "enum": [
              "classic",
              "evergreen",
              "winter",
              "minimal",
              "thanks"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "design_card"
    },
    {
      "description": "Corrects or removes a recipient in a saved list by row number. Supplied fields replace stored values; omitted fields remain unchanged. An unreadable row needs name, line1, city, state and zip. Rechecks required fields and US address format, plus USPS verification when configured. Format checks do not confirm deliverability. remove: true excludes the recipient. Lists belonging to paid orders cannot be changed.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "city": {
            "maxLength": 40,
            "type": "string"
          },
          "line1": {
            "description": "Street address",
            "maxLength": 64,
            "type": "string"
          },
          "line2": {
            "description": "Apartment, suite, unit",
            "maxLength": 64,
            "type": "string"
          },
          "list_id": {
            "type": "string"
          },
          "name": {
            "maxLength": 40,
            "type": "string"
          },
          "remove": {
            "description": "Remove this recipient from the mailing.",
            "type": "boolean"
          },
          "row": {
            "maximum": 9007199254740991,
            "minimum": 1,
            "type": "integer"
          },
          "state": {
            "maxLength": 20,
            "type": "string"
          },
          "zip": {
            "maxLength": 10,
            "type": "string"
          }
        },
        "required": [
          "list_id",
          "row"
        ],
        "type": "object"
      },
      "name": "fix_address"
    },
    {
      "description": "Returns a Card Mailer order's payment, printing, mailing or delivery status, send date, estimated arrival and per-recipient counts. The mailing_id is the last part of the order link. Does not change the order or track other USPS mail.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "mailing_id": {
            "type": "string"
          }
        },
        "required": [
          "mailing_id"
        ],
        "type": "object"
      },
      "name": "get_mailing_status"
    },
    {
      "description": "Imports US postal recipients from pasted text, CSV or XLSX into a saved list. Checks required fields and US address format; USPS verification runs only when configured, and usps_checked reports whether it ran. Format checks do not confirm deliverability. Returns list_id, ready counts and row problems. An existing list_id appends recipients, up to 300. Not for email, non-US addresses or advertising to purchased or rented lists.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "address_file": {
            "description": "A CSV or XLSX file the user attached.",
            "properties": {
              "download_url": {
                "type": "string"
              },
              "file_id": {
                "type": "string"
              },
              "file_name": {
                "type": "string"
              },
              "mime_type": {
                "type": "string"
              }
            },
            "required": [
              "download_url",
              "file_id"
            ],
            "type": "object"
          },
          "addresses_text": {
            "description": "Addresses as pasted text or CSV. One recipient per line (\"Name, Street, City, ST ZIP\") or a CSV with a header row.",
            "maxLength": 200000,
            "type": "string"
          },
          "list_id": {
            "description": "Existing list to append to.",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "import_address_list"
    },
    {
      "description": "Calculates the unit price including First-Class postage, total for ready recipients, send date and estimated arrival window for a saved US recipient list. A saved design_id includes that design's current front and back preview. Null design_id produces a price-only quote with preview_included: false. arrive_by adds the latest safe send date and whether the requested date can be met. Does not create an order or charge money.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "arrive_by": {
            "description": "Date the cards should arrive by, YYYY-MM-DD.",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          },
          "design_id": {
            "description": "Saved design identifier for the current front and back preview, or null for a price-only quote without a design. Required field.",
            "type": [
              "string",
              "null"
            ]
          },
          "list_id": {
            "type": "string"
          },
          "send_date": {
            "description": "Date to print and mail, YYYY-MM-DD. Default: the latest safe date for arrive_by, otherwise the earliest business day (today if it is one).",
            "pattern": "^\\d{4}-\\d{2}-\\d{2}$",
            "type": "string"
          }
        },
        "required": [
          "list_id",
          "design_id"
        ],
        "type": "object"
      },
      "name": "quote_mailing"
    }
  ]
}

What the leaf hashes

{"body":"0e83ef77a1ec86ee69ce75a72b6c56653c50c3879ecc9d19c56d596671d1a6e5","id":3987735,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1794091985864952,"prev":1225366,"subject":"959059f6-859f-489f-a309-869bd921a2d2","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-07 (195826 rows).

1. 0xffa21b6563f8d7395093d1bf392c230f879f77e70bb3ef864350d5d35a00c7a5
2. 0x17cb20a7922ad9168603241d7ab818b6e9697a9bcd950a88bd51d39884fed116
3. 0x869da2090dae6426ad1a286ebbcf86f852cdb47c71cad5a5c5c2ff89b9d1cb27
4. 0xbfedf4ddeecf06ee74e309b0f3d5fb02fe8534d3a2882663f70153672285b615
5. 0x01c421373076aae39f5f3ac736f909dc3ca3bdc2e650a4a09d18c50e34bee579
6. 0x407e2dd6a1dfed3df90834c8d8d61864ac8e249180853a6e836d55deffaa6808
7. 0x796317f244e08a1f25d6169505677b42353a44c9d89131b36103be6b90beefda
8. 0xc075294f4d99b5b4f48749ea0409062a3f0374343dba72054c79ffd2a5870774
9. 0x859984e71ed445850cc2c3a4cb6a90d85e9f0b96442dfef23d8ea0cd9b415e8f
10. 0x710481741fef16cd39a08d3f5310b2deafb98da456802288afe64027fba7ca52
11. 0x92e0c301383ceac58ed15367b5390cd8989050cb864378befbd9d54090e7e560
12. 0xda25430c2f3d69379bd02ba67d3fbdcd81dc411b23353fc04cff24decbd35a41
13. 0x9b2f897a7c7df5caf571ae836357f1a799a3231d5d70ab0cda89db6e4f10d727
14. 0x2f1bda65dd8929924c1dad6e9e29ab36a1b8cb4eed65c97434b87bf8d5cca017
15. 0xb6dc07358d0932b83c713d4c82df6764849db6e58ee1c7cbc06d03f381a6b36b
16. 0xbb3be27e5da5ccad91ce4674c6eac53275c0832f3885b89533d2be65d38f2fc6
17. 0x9ea7c2ecc6985da4b761b0f9096b7858b3ac8e3e47717c3840537fb2ff31c6df

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa