[nwf]

Agitate browser implementers to add support for magnet: URIs and you can do exactly that without needing to add new attributes to HTML. :)

There's a bug for firefox here: https://bugzilla.mozilla.org/show_bug.cgi?id=528148

[runeks]

Would certainly be nice to avoid tons of different href_sha256, href_sha512, href_sha3-512 etc. attributes.

But the browser supporting identifying files via hashes is vastly different from it fetching files via BitTorrent.

I think it makes more sense to pursue each separately. Even though magnet URI support will deprecate any existing implementation of hash support.