Evidence row 1500238

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://lessonspace.usefulapi.io/mcp"
    ],
    [
      "web",
      "https://usefulapi.io/lessonspace/"
    ]
  ],
  "name": "Lessonspace MCP by usefulapi",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-10-31T17:14:39.081829Z",
        "status": "active",
        "statusChangedAt": "2026-10-31T17:14:39.081829Z",
        "updatedAt": "2026-10-31T17:14:39.081829Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "description": "Read Lessonspace sessions, recordings, transcripts, spaces and users; launch spaces, edit sessions.",
      "icons": [
        {
          "mimeType": "image/svg+xml",
          "sizes": [
            "any"
          ],
          "src": "https://usefulapi.io/icon.svg"
        },
        {
          "mimeType": "image/png",
          "sizes": [
            "256x256"
          ],
          "src": "https://usefulapi.io/icon-256.png"
        },
        {
          "mimeType": "image/png",
          "sizes": [
            "512x512"
          ],
          "src": "https://usefulapi.io/icon-512.png"
        }
      ],
      "name": "io.usefulapi/lessonspace",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://lessonspace.usefulapi.io/mcp"
        }
      ],
      "repository": {
        "source": "github",
        "subfolder": "servers/lessonspace",
        "url": "https://github.com/m190/usefulapi-mcp"
      },
      "title": "Lessonspace MCP by usefulapi",
      "version": "1.18.0",
      "websiteUrl": "https://usefulapi.io/lessonspace/"
    }
  },
  "source": "mcp_registry",
  "summary": "Read Lessonspace sessions, recordings, transcripts, spaces and users; launch spaces, edit sessions."
}

What the leaf hashes

{"body":"23083456d32bb2594f23e4bf682346f808a4e962f533257b53102c0902e00a4c","id":1500238,"kind":"listing","method":"sync.mcp_registry/1","observed_us":1793466975398295,"prev":1482030,"subject":"mcp_registry:io.usefulapi/lessonspace","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-31 (246033 rows).

1. 0xe29ef1754614a87252cd106e915e50fcb496a62795f8e46d2afa7bc89623e88a
2. 0x027e6764c15bcf9d2989fbb93f89e465a3748063204a66c78360c8634feb1a56
3. 0x5465f3f0f635cedfcc637ea8ec48347190361b408d30ebb41d9e06bb4ff9d85e
4. 0x01b6bc4a73fd7d4608090322b9cc74e896a4e905860959774f186ec307ad7d73
5. 0x27fa481632a169f1e46cb1ffcddcfa7a027aa0381b449c4f477fa47fc0b67d07
6. 0x5797c1eb8438c89a84207e6a3f8cc17e59c70a384e227724796732a434fa4453
7. 0x8a8656fe622368f756f1f75679f736c4a61cfec2016f4fc7d64998a196fb50e8
8. 0x4118e37dbba60006aa62a0b351e6a7a8fabf50ba57d1c4f13bb895835c9bab72
9. 0x73570ea21aea6b5d69f787106a03e0f9253c4baf4b108abe95bf11896cd35085
10. 0x693f5a9e408b48c38b4ed17b776198b74baee53dc2b2045f64248be02ac35439
11. 0xe1a8c4c742a9bd87d416b06f86194382e4b482672319cafe66c4f0a6decf19ae
12. 0x6076fe8a07bfdd3ab4632dd135ca75f4386ff6d74ef340f64931d3ea53fbcf86
13. 0xb368588f0738889d76c0e4fa3a5ecbd3e7c2b633d3e42b9608c21c8572d0f3b7
14. 0x7a3059496dcef49b2fbe4b5eca13bdabed15efcf3581d4792babc5647855bfe5
15. 0x84bdb388a471b951dc5c0f9fd09df3197b8152707ec67daa668ab47102c8efc1
16. 0x24f03354dcb3a621317889ed99048bdf74b380516ca991bfb585c751d5cc7dfd
17. 0xa1146af524f673843507e7427a575964580eef01bc0e0eae466a7920df017ab2
18. 0x0504a25438f3c7932125463198ca74c5064f23f71a5c92763b3fc96a98cc8b57

Day root

0x24463725d1c0d9894bd6123691d532547aaa79f0762c0e45aa6a68acf1fd71ab

Chained

0x7d4824ff313dee7252a46f9d5c37b452851deb6c9f24a40c2f74ee0e53c82980

Published

On Arc Testnet, block 70093156: 0xedb7b832f4ebf6781b5ecd2ed241c435b862f4d3761541fa31adc1831b8c44a0