Magnet links from torrents already do this. You just need to have the SHA1 reference of the torrent, working effectively as a url, to load the metadata, and the

Magnet links from torrents already do this. You just need to have the SHA1 reference of the torrent, working effectively as a url, to load the metadata, and then the files described by the metadata payload. The P2P nature of the network then help the descentralization of sources, populating several clones of the dataset.