Evidence row 1001260

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": "2026-10-29T05:53:44.488312Z",
        "status": "active",
        "statusChangedAt": "2026-10-29T05:53:44.488312Z",
        "updatedAt": "2026-10-29T05:53:44.488312Z"
      }
    },
    "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": "0.2.0"
        }
      ],
      "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": "0.2.0",
      "websiteUrl": "https://pipeworx.io/packs/pubchem"
    }
  },
  "source": "mcp_registry",
  "summary": "PubChem MCP — NIH chemistry compound database (no auth)"
}

What the leaf hashes

{"body":"0881cc340b262c0416e1fa7c78994ee72660316bb972ccade5e7cbf753a7e4e4","id":1001260,"kind":"listing","method":"sync.mcp_registry/1","observed_us":1793254373487376,"prev":47280,"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 2026-10-29 (242798 rows).

1. 0x72bafc3500b093cfda4f8586da024abd8778a010710753e25778cf716e996a59
2. 0xb2a73590eb390a9ed0d585606500ac1e7fae614b6d40b01ad4b4c832deea5dec
3. 0x95f6df4dbc5658865c62ae7c0895693ac2c60202fde0b69060f94a2458379b03
4. 0x9bd1db939946e9b41bc6c17e95fa05cb784ee372afe5d360ee8e16c33005e920
5. 0xa7fb3db5e7db06ab5aad1267d410c3413bbb1594131750e1bb68777f64139e87
6. 0xe152a1e89986ca9b42e0af94df45b63c0e93ca65202d94b8e3f4870a07254fa1
7. 0x0465530708a95ce4b2b1aa0ad6f7eeb3e2a387a6949d2d2c1e9154789e9fc5ca
8. 0xd930fa7a74b665282dd79886fe4e7aca0932f20190ae32ede3cf6bcb79eee164
9. 0x5a5a148529101575729a4a46d91500c5d30904a09cc25ae8317a20e9529bb9b7
10. 0xfbc2c3486c82172153abf62c591515d56145dc84de0c3652920fc974d26d9227
11. 0x1e6a357994ae0db31fe48c8e5034e9425138287de7eaeb04c64fc5157fc05ab1
12. 0x198599590f19a8367bf24eba3e1fae27d0c053b385c7b1d55332950af453b540
13. 0xbc3fd8e509855b2d6ee4c13ed5f7f098e0a2473c66efc60e409ad0e77322a80f
14. 0xa07c03f1ff4a33c8a0105ab761d762ba211920a4e09af3e5ae84b51a3c4cf51b
15. 0x60b5befbd81f025904c8a3936b7ba86e3245ad5b37c615d01d42aa3227e3ed2e
16. 0xe2d603cd6f987214550319ad4fa39952b6098bc5c1b20893b6b80e8d82a79934
17. 0x91f12a2db1e2c1be07cbe4de3981a37a33051a36d3c3eee5a260804add6d1d75
18. 0xd56e61af23709ed9f460471e3c08400c0142ee83e1fd9057e46350d12edf9c07

Day root

0xc050555c6b023f2aefb6536efb9f0760b92c30a0d06c572b7daf63db259ea17c

Chained

0x4cde8bae2042512e1bec11650628f0293556311cc4ea74d99ffddf02b671a7d6

Published

On Arc Testnet, block 69753317: 0x9e85c340732f416e431b111fae72f7624870125f7f379af2732eb6c2ba8cf6a1