Evidence row 3131421

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://gateway.pipeworx.io/pubchem/mcp"
    ],
    [
      "web",
      "https://pipeworx.io/packs/pubchem"
    ]
  ],
  "name": "Pubchem",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-11-04T20:58:19.0749Z",
        "status": "active",
        "statusChangedAt": "2026-11-04T20:58:19.0749Z",
        "updatedAt": "2026-11-04T20:58:19.0749Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "description": "PubChem MCP — NIH chemistry compound database (no auth)",
      "name": "io.github.pipeworx-io/pubchem",
      "packages": [
        {
          "environmentVariables": [
            {
              "description": "Optional Pipeworx API key. Without it calls are anonymous and capped daily; a free key raises the cap.",
              "isSecret": true,
              "name": "PIPEWORX_API_KEY"
            }
          ],
          "identifier": "@pipeworx/mcp-pubchem",
          "registryType": "npm",
          "transport": {
            "type": "stdio"
          },
          "version": "0.2.1"
        }
      ],
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://gateway.pipeworx.io/pubchem/mcp"
        }
      ],
      "repository": {
        "source": "github",
        "url": "https://github.com/pipeworx-io/mcp-pubchem"
      },
      "title": "Pubchem",
      "version": "0.2.1",
      "websiteUrl": "https://pipeworx.io/packs/pubchem"
    }
  },
  "source": "mcp_registry",
  "summary": "PubChem MCP — NIH chemistry compound database (no auth)"
}

What the leaf hashes

{"body":"4fa860bd2698f6fa4999810fa679ef2619ecdc3f3eff8dec59ea15f65f9051b2","id":3131421,"kind":"listing","method":"sync.mcp_registry/1","observed_us":1793827262192725,"prev":1001260,"subject":"mcp_registry:io.github.pipeworx-io/pubchem","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-04 (424109 rows).

1. 0x251bdcbc366537975ba7fb7ca4fe4b32ef57eb3247e6df39e5b0ed5b74ffbf97
2. 0xd1a5fae3326cbfb02d018b2203e3ad6b10e10e25c07d78736dbca6ddc243a5cf
3. 0x8e18e177e0609ada30e04df4ad4f356a0028d4bd84816e9caa2dc2c95d914944
4. 0x1a894e7fb779826625a2cac521d12e0a4a4afcd229335f3d8052b74f1115f16f
5. 0xc65b06045a33402950ee2a75bb5bbf3a08b9ce1bf4ea2d4b885d62ff49e4b594
6. 0xdab42b530aeac2e9ee9752d34b3047df3b6e89e749fd89c082bbd007eecbb0f0
7. 0x555cfee9e6dacca6b85bf5f3455b1e556ac90c9342f4d2827a121924465ba557
8. 0xd342da3d17dd2d016104739aba6d10d223a43cbecc68eb1c25a2d209b736c8c9
9. 0x691cd6cb6f1df73375eed51cf9d9e3b5ef4b1d42eac0c73f306bbc6e90b7f867
10. 0x05d8e1b99cb85622ab2a6aae008d3051cbd222e22fa3eb774cd608da5fe64c8e
11. 0xbc8732c7bc511a75f2db6f5f15041720fd29f0f35ac2a95a593b6907013637c0
12. 0xc971a3dc3e6ad2fc14264451910f59a1702c3aacb1c31bd2fe02806668814191
13. 0xb1276e1f18f62d3b9c0a70be1610841483216e942feb1363145e3c1c0833d0ff
14. 0x982622869faf0b6bcbb8f0ada964d53e5e1bc6926f14fa553ea0b7f41e0643b7
15. 0x4abf06392be817fed1d4142854589c0ecb4a0254010bceee86244cf6d2d411f3
16. 0xa9c5ec1f03532da98f64c2c9386083d4c5202ff37eb07bd4beb6b8db6e4b8c1e
17. 0x01c26569ec8e231551522ab452fd5d417c3d66f29c7c76886a8ec295a18dd624
18. 0x02f64ca19e7d9b09718851d2ce3abf641982580de99411626d894607cf386cd5
19. 0x10067354f57fa0cd86b7423e67cc1c7d107d7c9c6823df5246c4fb63b60575e5

Day root

0xd4eed8c0ea3c90ec6f262b19fcc3b849f30cb82a0f84b8b89569e48af7d0c1ee

Chained

0x59305749c32724a02a23c368834d8a36ae9908da93a915e2962fffe01b4e591b

Published

On Arc Testnet, block 70772483: 0x813d56041c1efd407e56047129b597b154a1cb26458bb2768fd0a4630ac97345