Evidence row 266780

What was observed

{
  "count": 3,
  "tools": [
    {
      "description": "Official past-paper archive links per spec (links to the board's own assessment-resources page — papers are board copyright, so no hosted PDFs).",
      "inputSchema": {
        "properties": {
          "board": {
            "type": "string"
          },
          "level": {
            "type": "string"
          },
          "subject": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "exam_paper_index"
    },
    {
      "description": "UK exam specification metadata: spec codes, paper structure (count, duration, marks, calculator rules, tiers), topic lists per paper, official spec links.",
      "inputSchema": {
        "properties": {
          "board": {
            "type": "string"
          },
          "level": {
            "type": "string"
          },
          "subject": {
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "exam_spec_lookup"
    },
    {
      "description": "Which exam paper is a topic on? The canonical student revision question (\"is electricity paper 2 AQA?\" — answer: no, Paper 1). Input a topic plus optional board/subject/level; returns the paper, sibling topics on that paper, spec code, and the official spec URL. Knows quirks like AQA Combined Science Trilogy Physics Paper 2 having no Space physics. Coverage: AQA GCSE Physics (8463); AQA GCSE Biology (8461); AQA GCSE Chemistry (8462); AQA GCSE Combined Science: Trilogy (8464); AQA GCSE Mathematics (8300).",
      "inputSchema": {
        "properties": {
          "board": {
            "description": "e.g. aqa",
            "type": "string"
          },
          "level": {
            "description": "e.g. gcse",
            "type": "string"
          },
          "subject": {
            "description": "e.g. physics, combined science",
            "type": "string"
          },
          "topic": {
            "description": "e.g. electricity, forces, ecology, organic chemistry",
            "type": "string"
          }
        },
        "required": [
          "topic"
        ],
        "type": "object"
      },
      "name": "exam_topic_paper"
    }
  ]
}

What the leaf hashes

{"body":"46e854069b34ea4044eb6f8269aae3d5afeeab03ba2e14d9a664f0ccc22f21e5","id":266780,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793035532607235,"prev":null,"subject":"83fb153e-0110-4f1e-9911-92d8153b4c77","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. 0xe02e5d2e30a11227f74565a4c6ea6a34090eb2edd85269a9e05ea2e88f97ff8f
2. 0xa58809604b37d96b75f8ba41fcd67bf725eff80823ca8b8a89cce5e5601d555e
3. 0x5c99aa4f1bf7d620c5079748d672b2743ca4c3e6e66119b52b3c7446d76cbf7f
4. 0x78ae9e72d2713ba422fa1db6b6567e1b0b9c46821cdc1793180ae2734bd326a1
5. 0x78d9a3e6eefc45b74bdc5cba0408ae0b9794d492943c98b85ff00ea1ca8525fa
6. 0xe799f7bccf817ebe39ae32d7262726f8a10b0a65fe737e038da40e8be7267b9e
7. 0x757aff9b7e0d00091e579cbcd2d98a12bc6efe0a132cde3f28a629e61af44479
8. 0x8503b4699e2331c59be42075639dff004bcda406fd58c832da9ec14e4d9aba44
9. 0x16cb4ca51ff0730975eeaffa7ef65a08bd9a5708a11cdafec5b59f6ceff66b02
10. 0x6ff4120b0309d1afe829772edab6c960527c15f95727cac1d6a063da5f24cd85
11. 0x07a6fcdebada154e3a5a086ae2c78ad003011940759e5f38c005cc9b2ec3ef9d
12. 0x1cde596bd397df62b2525df79e5a761af7d1a292cbcfd283ea8977aecf9334e7
13. 0x3fcdf7fa32ccefe771eb57ae3015142065d64e3ce732fea7d11b9a3c99dde44f
14. 0x0b7541c75cc482a7134110311d7dbd02095d969ba21177de9b21a52a55981718
15. 0x6dc40f983a3840a0ad927a9ca17f4ff1e3b649a6c735e2a09b140db7c2caf13b
16. 0x703f95866af09c5e5d6ead7411e9a10f964a41a2aff64d4a55ff0053c023a023
17. 0xd0651cb9bc8155eb52b5247d506e74b8a935057dc190ba52091702ac25ed3a40
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae