Evidence row 3987054

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://retainful.usefulapi.io/mcp"
    ],
    [
      "web",
      "https://usefulapi.io/retainful/"
    ]
  ],
  "name": "Retainful MCP by usefulapi",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-11-07T21:56:51.25208Z",
        "status": "active",
        "statusChangedAt": "2026-11-07T21:56:51.25208Z",
        "updatedAt": "2026-11-07T21:56:51.25208Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "description": "List contacts and lists; create contacts, add them to lists and record events in Retainful.",
      "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/retainful",
      "remotes": [
        {
          "type": "streamable-http",
          "url": "https://retainful.usefulapi.io/mcp"
        }
      ],
      "repository": {
        "source": "github",
        "subfolder": "servers/retainful",
        "url": "https://github.com/m190/usefulapi-mcp"
      },
      "title": "Retainful MCP by usefulapi",
      "version": "1.2.5",
      "websiteUrl": "https://usefulapi.io/retainful/"
    }
  },
  "source": "mcp_registry",
  "summary": "List contacts and lists; create contacts, add them to lists and record events in Retainful."
}

What the leaf hashes

{"body":"6279375ff5401554dd7e316e1e410a48b22254de322324586072135d66fe5b69","id":3987054,"kind":"listing","method":"sync.mcp_registry/1","observed_us":1794090327145706,"prev":3958279,"subject":"mcp_registry:io.usefulapi/retainful","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. 0xc165e43f56908e0e79072dc4c26d563fa9efb55ee475133fbe55ac8234197272
2. 0xd4e4e76d0b77c2aa18726d099afc2f1cc2de6657343b025d47e02a3046139c2f
3. 0x3ea2e3492f4ff08c16103c451e87edbbd2ad4326031ae9a0a646a2f0e196d089
4. 0x7a15f0d220bd81f33cb8e0f05ee0b53417e86ee164fa0f5894311f3795d589a6
5. 0xe5bda6b5381f47aca63cc533a15e9103f81489ecadb8a569364b654c9c7aca95
6. 0xb917562dae5098f3874c6e301d922304ac66755d094879bc48a57bef6f980f9d
7. 0xfaf511b84b8585e3252a4257a711663f1956e2d4fd87178dc523996895ceb9d0
8. 0xfb3683daed111eb891f248673f8ab65f600d1f490babbfa96c9ca5330ec8383a
9. 0x9535dee6adb0474ac1ed3e5a5e1e6c5407aa10d79b8aa298eb453838c2e221d5
10. 0xcf49fea2a9d99173a5337f62ac86de72c6d2b7953715e7c07d9a8be00c661d23
11. 0x1abb8ec52cefc02713add1de2564b8ac58e52507f597a8af5c554bc7c3b8303c
12. 0x1df3f0f6a4629e2ef2efcd3b5d19c6944ea2fdb0ea0d7d744baa98e6efc753c4
13. 0x6da57bac13a3d747bd5ab6e3bc301f77a33423bf49d8a86a45250fad500ff0ff
14. 0x377e506e7caa62a458c54a51036fb3c308f8113f5f6e53d577ff2a07c84142c4
15. 0x8d59bf422a3db88dd24fca3b92cb99d28bd5632a71eaf94e51b925600c735b27
16. 0x3235c8a33ac14441f1a12a6515f670286d48b48fa98eb1dce45d902e053abe01
17. 0x9ea7c2ecc6985da4b761b0f9096b7858b3ac8e3e47717c3840537fb2ff31c6df

Day root

0x17da9e85e1b138541355d33543ff34e3503cd3a49d37728fb53643e2a0416a2d

Chained

0xed34bd4af17282643de8cb9591c84d0aa1b39e1e9ae9864941e543f5a15718cb

Published

On Arc Testnet, block 71280839: 0xc3f6784179e0ca32236ba89472473e882a81d03fcc5ce27ca58ded2e01e112aa