Evidence row 3986888

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": "2026-11-07T21:54:59.905635Z",
        "status": "active",
        "statusChangedAt": "2026-11-07T21:54:59.905635Z",
        "updatedAt": "2026-11-07T21:54:59.905635Z"
      }
    },
    "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": "1.23.5",
      "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":"4a8e1344b3665ae461884910cb69ee3196652ac35dafe61a58002cf2a9f7908e","id":3986888,"kind":"listing","method":"sync.mcp_registry/1","observed_us":1794090326192885,"prev":3958119,"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 2026-11-07 (195826 rows).

1. 0xc90efdafdd58474dc678f856be40bc9ed0fe1a175b9802c51770534c69264a9e
2. 0x5ff1a55f74facdaf929bc30fe72cbe73a8448651f0e181b2657756f15db38c93
3. 0x1433bcad8abba863385b52fdef1843286cbfdb1781a42726e7d8e801b5ff04df
4. 0x4029cafd719fff06277bce742afd9452ebb24b0eac3d84d4e1c4c61620ed83af
5. 0xedb3600ca8c66e15c2eb2fb5b7f635e572f5858800158e837c87f77b66f1177f
6. 0xd2e170d18bd4330c04d68faff22340f897356830dd4f8bd32b4e349a597ef171
7. 0x7e98c2cfc10175e5839054e1755026fa5ebef38a1ec479714e0ae8fe5056929f
8. 0x3555b6fde054a08f35bf10ee871c231d72e9e2ff19d77e2bfe715cf79be161de
9. 0x0a0b7b9c51c8002019705c333f2c74307f0184fff0fb6bf80138603602b2f028
10. 0x6b8b61ed0fd66e1a1ab4e69f78e0fa88c185da177ec37d50e4b5caf0ca2242cd
11. 0x5fa0816a61ac713f6dcf1d64d2f706fa70750bfef1d7bea36b497ab69fabff58
12. 0xabbe8f418d50a7f0a5751d31d63a1003d11f109965d483c5b38a1232b3eaaaec
13. 0xd2754d3418fabe8f49343a437b411b6820a6cbc6fdbb87b67ddb830f75eb14e2
14. 0x377e506e7caa62a458c54a51036fb3c308f8113f5f6e53d577ff2a07c84142c4
15. 0x8d59bf422a3db88dd24fca3b92cb99d28bd5632a71eaf94e51b925600c735b27
16. 0x3235c8a33ac14441f1a12a6515f670286d48b48fa98eb1dce45d902e053abe01
17. 0x9ea7c2ecc6985da4b761b0f9096b7858b3ac8e3e47717c3840537fb2ff31c6df

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa