dtan/README.md

  {
    "kind": 2003,›
    "content": "<long-description-pre-formatted>",
    "tags": [
      ["title", "<torrent-title>"],
      ["size", "<size-in-bytes>"],
      ["btih", "<bittorrent-info-hash>"],
      ["t", "<top-level-tag>"],
      ["t", "(optional)<second-level-tag>"],
      ["t", ...other tags],
      ["file", "<file-name>", "<file-size-in-bytes>"],
      ["file", "<file-name>", "<file-size-in-bytes>"],
      ["file", ...other files],
      ["imdb", "(optional)<imdb-entry-id>"]
    ]
  }

Top Level tags are usually the type of content like "Video" / "Audio" / "Application" and so on.

Second level tags are sub categories like "Movies" / "CAD/CAM"