[bravura]

It would be quite nice if there were a community-based way of sharing fingerprints.

[gradientsrneat]

I'd love to see this also, for audio but also picture and video clips as well.

iirc Bittorrent uses a DHT, but the hashes are of the entire content. Not so useful for, say, finding the original version for poorly attributed derivative works.

Tineye is sometimes good for finding the original version of an image.

[johnneville]

I think musicbrainz supports this https://musicbrainz.org/doc/AcoustID