Advantage of torrent is that 512byte chunks may be corrupted, but because it is sources from different sources, one bad 512 byte chunk will not cause the whole file of 600MB to get corrupted. Rather, the bad MD5 sum of the bad 512byte is trashed, and sourced from alternate routing peer. This allows the inherent advantage of torrent to download, accurately the large files.
This means, from authentically source torrent server list (especially through HTTPS) is always going to have trust value of 1:1.
Of course, you must always check the MD5 or SHA1 (or other hashes) to verify the true accuracy of the downloaded file.
According to Tails Linux (tails.boum.org) recommendation, you should (if absolutely paranoid about it) download same file repeatedly to make sure you are able to generate same MD5/SHA1 hashes, to TRUST the servers from where you have downloaded the Torrent action file.
2You should always verify the final image hash regardless. – Ignacio Vazquez-Abrams – 2012-08-15T01:10:42.090
1Nothing is "safe" on the internet, period. images/files can be manipulated and retain the original hash. Its all based on faith. – Moab – 2012-08-15T02:21:11.887