When I create a dat, it gives me a dat.json file. The dat.json file currently describes a single dat. For example,
From the existing dat.json spec:
{
"url": "dat://37ad8eb8d7f...",
"title": "This is My Dataset",
"description": "This is a one or two line description of the archive for Human People",
"author": "Karissa McKelvey <karissa@mckelvey.edu>"
}