dot_net_guids lists identifiers of Microsoft .NET assemblies.

mvid: <string> ModuleVersionID, generated at build time, resulting in a new GUID for each build.
typelib_id: <string> TypeLib ID (if present), generated by Visual Studio on the creation of a new project by default.

{
  "data": {
		...
    "attributes" : {
      ...
      "dot_net_guids": {
        "mvid": "<string>",
        "typelib_id": "<string>"
      }
    }
  }
}

{
    "data": {
        "attributes": {
            "dot_net_guids": {
                "mvid": "c24b4a43-444e-4468-4081-c4422484a246",
                "typelib_id": "48484de4-4465-4403-448f-45c148474bf4"
            }
        }
    }
}