Seems like this pointlessly duplicates the "Naming things with hashes" ni: and nih: URI schemes, standardised as https://tools.ietf.org/html/rfc6920 . (IPFS actually uses a proprietary "package" representation as parent points out, so there's little harm in it not using ni: URI's. But standard hashes of the underlying resource should use those. "Magnet" links are similarly problematic, but these at least support a few convenience features.)