There are other P2P networks that can give you files based on a hash of their content, for example ED2K and Kademlia. I think even Gnutella supports hash-based

There are other P2P networks that can give you files based on a hash of their content, for example ED2K and Kademlia. I think even Gnutella supports hash-based retrieval. BitTorrent clients now have distributed hash tables accessible; it would be nice if magnet URLs could just point to a hash of the file, instead of to a specific torrent. Bonus: Even ED2K links point to a tree of hashes, so you can verify the data while it is being downloaded.