Evidence row 56071

What was observed

{
  "endpoints": [
    [
      "mcp",
      "https://printpal.io/mcp"
    ],
    [
      "web",
      "https://printpal.io/"
    ]
  ],
  "name": "PrintPal",
  "owner_address": null,
  "raw": {
    "_meta": {
      "io.modelcontextprotocol.registry/official": {
        "isLatest": true,
        "publishedAt": "2026-10-16T21:56:16.224948Z",
        "status": "active",
        "statusChangedAt": "2026-10-16T21:56:16.224948Z",
        "updatedAt": "2026-10-16T21:56:16.224948Z"
      }
    },
    "server": {
      "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
      "_meta": {
        "io.modelcontextprotocol.registry/publisher-provided": {
          "authentication": "none (optional API key)",
          "categories": [
            "3d-printing",
            "cad",
            "maker",
            "education",
            "search"
          ],
          "openapi": "https://printpal.io/mcp/openapi.json",
          "privacyPolicy": "https://printpal.io/privacy",
          "serverCard": "https://printpal.io/.well-known/mcp.json",
          "termsOfService": "https://printpal.io/terms",
          "tool": "printpal-mcp",
          "tools": [
            "search",
            "fetch",
            "search_3d_models",
            "get_3d_model",
            "find_3d_printing_tool",
            "calculate_print_cost",
            "calculate_filament_usage",
            "calculate_layer_heights",
            "calculate_volumetric_flow",
            "search_build_guides",
            "get_build_guide",
            "search_learning_resources",
            "generate_3d_model",
            "check_3d_generation",
            "design_parametric_cad",
            "get_pricing_and_plans"
          ],
          "version": "1.0.0"
        }
      },
      "description": "3D printing: printable models, calculators, troubleshooting wiki, build guides, AI 3D + CAD design.",
      "icons": [
        {
          "mimeType": "image/png",
          "sizes": [
            "96x96"
          ],
          "src": "https://printpal.io/static/assets/img/printpal-icon.png"
        }
      ],
      "name": "io.printpal/printpal",
      "remotes": [
        {
          "headers": [
            {
              "description": "Optional. `Bearer pp_live_…` PrintPal API key (printpal.io/api-keys) unlocks credit-metered AI 3D generation. All search, calculator and knowledge tools work without it.",
              "format": "string",
              "isSecret": true,
              "name": "Authorization"
            }
          ],
          "type": "streamable-http",
          "url": "https://printpal.io/mcp"
        }
      ],
      "title": "PrintPal",
      "version": "1.0.0",
      "websiteUrl": "https://printpal.io"
    }
  },
  "source": "mcp_registry",
  "summary": "3D printing: printable models, calculators, troubleshooting wiki, build guides, AI 3D + CAD design."
}

What the leaf hashes

{"body":"62ce25bc792f5ee7f0023f6be24f459c851b59e0278d1b26971ab67cd235daef","id":56071,"kind":"listing","method":"baseline/1","observed_us":1793025436480329,"prev":null,"subject":"mcp_registry:io.printpal/printpal","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xa1c37cf1c7749f88d3627c7a3f0af8d8dcfc78b99cae001eb05c18008683d2f9
2. 0x4aedc6c0a8d9bb696492e54a26a9e317a9302c04316db678e892831b57bc97da
3. 0xab693364d21c254617239e831105fc26c2eb727ccc2e14c5377c1c9c22bbfbfe
4. 0xe04549f5c894585dbf51783c8ede7f85055ebff7d6036d189ccebfbbb7504fc3
5. 0x346ebc1c963177ee51f6ba33a87ad88044013ab897d5b3620d81b403a4dfeb7f
6. 0x8bf226e6294141b1ef5c89876fbfba884a88f8ede13ecbee927e78cfd33a8905
7. 0xedee4e03630cd7c716b612b0b49b30e284d0e67e675127b5fb210275344e7be6
8. 0x4211677b07c6760e313374125ec1cc29b609e7dcfaecbb88aa514524c6812048
9. 0x3977c977191cf3ef1caf8318d813f4839d1c2bf747123c253c44690bd7a4b0c9
10. 0xb3f8079d3f950c3f93c2829ed52d6d83dba720fdb1aef8897303edba370e9d0f
11. 0x9ca444fcd24e94bee95de2e8d69f385e59ecdaff6c1b017632bff037809c381b
12. 0x95576cc3dd18642c859f679cefa1cf80bfc6c690b065916c3585b14e8ef4b1b3
13. 0xf8d3e004d9a208d2c5e82ab676956d80f8a3c78387c61dad15a3a8269efee0d8
14. 0x6713795704ddd9c528d421fadd9cc96b0200a4ddbba84f88e718d4968dde888b
15. 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae