Evidence row 19158

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://pplfree.com/mcp"
    ],
    [
      "web",
      "https://pplfree.com/mcp-server"
    ]
  ],
  "name": "PPL Free Ground School",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-09-26T18:59:53.556116Z",
        "status": "active",
        "statusChangedAt": "2026-09-26T18:59:53.556116Z",
        "updatedAt": "2026-09-26T18:59:53.556116Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "_meta": {
        "io.modelcontextprotocol.registry/publisher-provided": {
          "authentication": "none",
          "notice": "Source: PPL Free Ground School (pplfree.com), an independent study platform. Not FAA-approved and not affiliated with the FAA. Content is reviewed through an AI instructional-review system (AI_CFI), not by a certificated flight instructor. Always verify against current FAA publications and your instructor before acting on it in flight.",
          "support": "support@pplfree.com"
        }
      },
      "description": "Free FAA private-pilot ground school: source-cited answers, lessons and practice questions.",
      "icons": [
        {
          "mimeType": "image/png",
          "sizes": [
            "512x512"
          ],
          "src": "https://pplfree.com/mcp-icon-512.png"
        },
        {
          "mimeType": "image/png",
          "sizes": [
            "1024x1024"
          ],
          "src": "https://pplfree.com/mcp-icon-1024.png"
        }
      ],
      "name": "com.pplfree/ground-school",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://pplfree.com/mcp"
        }
      ],
      "title": "PPL Free Ground School",
      "version": "1.0.0",
      "websiteUrl": "https://pplfree.com/mcp-server"
    }
  },
  "source": "mcp_registry",
  "summary": "Free FAA private-pilot ground school: source-cited answers, lessons and practice questions."
}

What the leaf hashes

{"body":"2bb929bbe49de048f6252271274437dead717523d0fc05ab4c2d343764887c2d","id":19158,"kind":"listing","method":"baseline/1","observed_us":1793025331207632,"prev":null,"subject":"mcp_registry:com.pplfree/ground-school","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. 0x3399c5bb61afaae379bc7031ca547d0f10570a81ee131de4592399acaf874c46
2. 0xc4978c23fb1d693d0859104704dbc1cf7fc07d0a3307d42e02056234c56a0400
3. 0x8cf5d129c70c94ac58b75430079763307d1e37c2a0ed86853f7c03ff65fd5f6f
4. 0xa271767e4b9273a2a15d859a7ec617ba4658c99f194b59514ecde4d5545264d2
5. 0x8f91b2383e6face339f1e04ebc68ae475a8aac19c58c4f1993b9bdc8e9684eed
6. 0x3d2647bb48afa7a8fe4725b2df543aed9049ff0e8cb7f739dcefa323675861b1
7. 0x06d6da5763f56d8c91f7cde580edc9e44fc40a67c06eebc81a2241fa08a38db2
8. 0x6c2f1e3cf84115c3877d06ce52b1de340707d86c37ac8d045c2a9978e3d4e3f8
9. 0x81334d8903787285925f380ef366ce723c8cf8fbca086aa6a83beacb9e428628
10. 0xcc3de2228ca9f90722824aeb1f6740dce363ec54f1223a4bfc96d012376efbc0
11. 0x25f1494b636c5e3c47bd014c16b8f4b5df5a8fb62efdc32979420416a8736679
12. 0xe57be1a98d96d75db9e9d2122794eabebfd735dea66e9d16ca63347243b3d483
13. 0x08de74b7fb265ddb83e4c673da8a94e5f71829b2e6e7464c71c5138e450f2217
14. 0x4338355a835617a26aa0bfcc971e84eb030d84e2aa840e3c8af958921dd080c7
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae