Evidence row 309164

What was observed

{
  "count": 5,
  "tools": [
    {
      "description": "Adds board text to the board the teacher has open, behind a live link (.../live/<id>). place \"current_page\": put it under what is on the page the teacher is on (write ONE page: the next step, a hint, a drawing). place \"new_pages\": add your pages after the last page (exercises, answers, a new topic). Call check_board first: a text with errors is not added. Nothing on the board is changed or removed; the teacher can undo the addition.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "link": {
            "description": "The live link the user gave you: .../live/<id>.",
            "maxLength": 300,
            "type": "string"
          },
          "place": {
            "description": "\"current_page\" (under what is on the teacher's page; one page of text) or \"new_pages\" (after the last page).",
            "enum": [
              "new_pages",
              "current_page"
            ],
            "type": "string"
          },
          "text": {
            "description": "The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood lines under ### step headings. The ~~~mathboard fence around it is optional.",
            "maxLength": 300000,
            "type": "string"
          }
        },
        "required": [
          "link",
          "text",
          "place"
        ],
        "type": "object"
      },
      "name": "add_to_board"
    },
    {
      "description": "Checks a board text without publishing it. Returns what the board understood, page by page, and every problem with its line and how to fix it. Fix every ERROR, then call check_board again. When there are no errors, call publish_board.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "text": {
            "description": "The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood lines under ### step headings. The ~~~mathboard fence around it is optional.",
            "maxLength": 300000,
            "type": "string"
          }
        },
        "required": [
          "text"
        ],
        "type": "object"
      },
      "name": "check_board"
    },
    {
      "description": "Returns the Math Board text format with a complete example. Read it before writing a board, unless you already have it.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "get_board_format"
    },
    {
      "description": "Publishes a board and returns a link that opens it in the user's browser. Call check_board first. A board with errors is not published: the problems come back instead. Give the link to the user exactly as returned.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "text": {
            "description": "The whole board in the Math Board format: # title, ## pages, Markdown with $...$ formulas, :::graph, :::geometry, :::solid blocks, and :::comment, :::say blocks and :::mood lines under ### step headings. The ~~~mathboard fence around it is optional.",
            "maxLength": 300000,
            "type": "string"
          }
        },
        "required": [
          "text"
        ],
        "type": "object"
      },
      "name": "publish_board"
    },
    {
      "description": "Reads the board behind a Math Board link the user gave you and returns it as board text, in the same format you write. Ink, images, widgets and the audio of narration cannot be written as text and are listed as left out (narration text is kept, as :::say; the moods of the wire man as :::mood). For a live link it also says which page the teacher is on.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "link": {
            "description": "The Math Board link the user gave you, exactly as given: .../live/<id> (the board open now) or .../s/<id>#<key> (a shared copy).",
            "maxLength": 300,
            "type": "string"
          }
        },
        "required": [
          "link"
        ],
        "type": "object"
      },
      "name": "read_board"
    }
  ]
}

What the leaf hashes

{"body":"39e6ce2116672c6676a4151e420c53736369f3d702a45e07b2d7979e23beb0a0","id":309164,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793058726507381,"prev":null,"subject":"0a02e5c5-8bf4-43a3-90c0-c9596e9cf45e","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. 0xe438f9db2163a27b33f04031db7502b7e4f295154e639d2b92a9c039b8e358ea
2. 0x1910133e60159855db3811ef998827c111e679bf94f5b0921162e2c07bc0254e
3. 0xf696851d1043225e21f5424ccede4e88298e1a75293bc3f1f1276af13b7af2a1
4. 0xfffba431beb0612810184fb03caeef81e968efbf60e922e4f04635fdc34bf6fe
5. 0x0776f89bb8cabe239fbe1dcad87bdac49ca6b079615d46815aaef081908acab9
6. 0x1473272af0456214f319a1e9c6628c716b1b9e3ea2b143b8411ebeceb2ffd0be
7. 0x6394dcc8b99ad477ee57619486eb9038c6c8e683c611d3c48c9955bfe13bbba9
8. 0x395f61e6625c1dc176541b74895a8b1eda76119ac8fb5a21911d0a775dbd998d
9. 0x45d3c59c7999f42e6d930b3fe7fb7f47d05513d5a89633dbd7b18dc84b21d207
10. 0x15726dc36d12291b4937cc1d22f325d4939ad46dd10d4e44468a88a8cc8329ed
11. 0x162e0da99198c9cdc9c43bf4626e85f4a7092fdb31ea15c7126e1f98b20eaa56
12. 0x2fc38b57208d692aab1ee89b6e26917df292126314027c27360c5644a63fd0bc
13. 0xc0924a0807e534382f518663123231c317124338831a2b310de2c17b09677086
14. 0x9bc5fc98278b9f6dc18c66c6e162aefd5244be03170d41bc5161f58ad11beed7
15. 0x95657a7d540ed6cac0bde9995782333b2562a9a6641853269ac95148827410f0
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae