[WhiteOwlLion]

Aren't torrents block based so file boundaries are not observed without hacks?

[rakoo]

torrents are file-based but in v1 the edge of a file doesn't map with the edge of a piece, so you can't easily find file's hashes.

In v2 this is solved and it is possible to easily know the hash of each file in the torrent, so you can search for it in other torrents