Evidence row 300490

What was observed

{
  "count": 10,
  "tools": [
    {
      "description": "Cancels an incomplete signature request. Destructive — signers can no longer sign. API: POST /signature_request/cancel/{signature_request_id}.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "signature_request_id": {
            "description": "The id of the incomplete signature request to cancel.",
            "type": "string"
          }
        },
        "required": [
          "signature_request_id"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_cancel_signature_request"
    },
    {
      "description": "Get info about the API-key owner's Dropbox Sign account (id, email, quotas, plan). API: GET /account.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {},
        "type": "object"
      },
      "name": "dropbox_sign_get_account"
    },
    {
      "description": "Get the status and details of a single signature request by id. API: GET /signature_request/{signature_request_id}.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "signature_request_id": {
            "description": "The id of the signature request to retrieve.",
            "type": "string"
          }
        },
        "required": [
          "signature_request_id"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_get_signature_request"
    },
    {
      "description": "Get a temporary URL to download the signed document(s) for a signature request. API: GET /signature_request/files_as_file_url/{signature_request_id}.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "signature_request_id": {
            "description": "The id of the signature request whose files to fetch.",
            "type": "string"
          }
        },
        "required": [
          "signature_request_id"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_get_signed_files_url"
    },
    {
      "description": "Get the caller's team, including its members and invited members. API: GET /team.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {},
        "type": "object"
      },
      "name": "dropbox_sign_get_team"
    },
    {
      "description": "Get a single template's fields, roles, and metadata by id. API: GET /template/{template_id}.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "template_id": {
            "description": "The id of the template to retrieve.",
            "type": "string"
          }
        },
        "required": [
          "template_id"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_get_template"
    },
    {
      "description": "List signature requests the account can access, newest first. Paginated. API: GET /signature_request/list.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "account_id": {
            "description": "Account id whose requests to list (defaults to the caller).",
            "type": "string"
          },
          "page": {
            "description": "Page number to return. Default 1.",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991,
            "type": "integer"
          },
          "page_size": {
            "description": "Results per page (max 100). Default 20.",
            "exclusiveMinimum": 0,
            "maximum": 100,
            "type": "integer"
          },
          "query": {
            "description": "Search string to filter requests (e.g. title, signer email).",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "dropbox_sign_list_signature_requests"
    },
    {
      "description": "List reusable templates the account can access. Paginated. API: GET /template/list.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "account_id": {
            "description": "Account id whose templates to list (defaults to the caller).",
            "type": "string"
          },
          "page": {
            "description": "Page number to return. Default 1.",
            "exclusiveMinimum": 0,
            "maximum": 9007199254740991,
            "type": "integer"
          },
          "page_size": {
            "description": "Results per page (max 100). Default 20.",
            "exclusiveMinimum": 0,
            "maximum": 100,
            "type": "integer"
          },
          "query": {
            "description": "Search string to filter templates (e.g. title).",
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "dropbox_sign_list_templates"
    },
    {
      "description": "Sends a reminder email to a signer for a pending signature request. API: POST /signature_request/remind/{signature_request_id}.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "email_address": {
            "description": "The email address of the signer to remind.",
            "type": "string"
          },
          "signature_request_id": {
            "description": "The id of the pending signature request.",
            "type": "string"
          }
        },
        "required": [
          "signature_request_id",
          "email_address"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_remind_signature_request"
    },
    {
      "description": "Sends a signature request built from template(s) to the given signers. When test_mode is true (default) it does NOT send real emails; set test_mode=false to send a REAL, legally-binding signature request. API: POST /signature_request/send_with_template.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "properties": {
          "message": {
            "description": "Message body for the signature-request email.",
            "type": "string"
          },
          "signers": {
            "description": "Signers to send to. Each { role, email_address, name }; role must match a template role.",
            "items": {
              "properties": {
                "email_address": {
                  "description": "Signer's email address.",
                  "type": "string"
                },
                "name": {
                  "description": "Signer's full name.",
                  "type": "string"
                },
                "role": {
                  "description": "Signer role name — must match a role defined on the template.",
                  "type": "string"
                }
              },
              "required": [
                "role",
                "email_address",
                "name"
              ],
              "type": "object"
            },
            "type": "array"
          },
          "subject": {
            "description": "Subject line for the signature-request email.",
            "type": "string"
          },
          "template_ids": {
            "description": "Template id(s) to build the request from.",
            "items": {
              "type": "string"
            },
            "type": "array"
          },
          "test_mode": {
            "description": "Test mode. Default TRUE — no real emails sent. Set false to send a REAL legally-binding request.",
            "type": "boolean"
          }
        },
        "required": [
          "template_ids",
          "signers"
        ],
        "type": "object"
      },
      "name": "dropbox_sign_send_with_template"
    }
  ]
}

What the leaf hashes

{"body":"345ff27144c8a077cf290dc9d8788343514f5270eb33234b1f79cf9bf1446c91","id":300490,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793053490748425,"prev":null,"subject":"4fcfdad2-f565-47c6-b9e0-7d8df3adfa1b","subject_kind":"endpoint"}

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. 0xf35324e1e43f57f1e06651f1f5f8484e97b8a5cd82c477bdd5e4f4c854e330a5
2. 0x5426bc7d17c11f9eb2380661bb6f0232aa5e9b0b8e1a8fc2ccc217f0f894358c
3. 0xc5ce11400c81ff4ec21484fb82f5bac7897b86d6d984d5eeac76b2c7838b3ea4
4. 0x8356b56806b91d7f519d7b062d6cb0aca68640c8f31a264be93b8589284342f9
5. 0xf0bd1630ef64f4db5484dd38eaeccbc4eda94222a1b40ccaba4d9e006fcbfb39
6. 0x70d327b1a0f6dc9586cc1fad50cfbaced9d2b811b2acc0977ffb2037d643a776
7. 0xee2ebd1153b59646a713574a8fe9b764a02f8f8b5f95ae4db723da84536ead20
8. 0x7cdb3104688500174065a8cb1a66bebeacfca1e2bd001f4f1013776fd8a05c76
9. 0x488da1831238d58942e96bb67705d58874d3df058d0910bd6904259ce950417a
10. 0x99d8731791d25cbf46b06609ddccbc89c11d0e501cf96838a0656d4362666008
11. 0xc50899a255d8f2b1b1fc55129b98f94521e73c5252d7c947abcfcdde2955260c
12. 0x3e439c99553dde4ddc1a9189bc043fa92a4b6b41e39e7e6b21c10148f9558a78
13. 0xa26f0437cba4d7d64f1cf98bf4f490e1ebb6f66a5e2331537b7ba8b3061084e0
14. 0xd769d41500075835c3b2f9184d223699fb983fd05c29fbcb44d964abc7ee380d
15. 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae