@jcx64 - If you're referring to my torrent it's not a self-compressed file; I redownloaded the gzipped original and created a new torrent with it...not sure why the hash doesn't match.
[edit] Just double-checked...did you spot that the official Retropie image is now at 3.8.1? My torrent is the 3.8 version; not sure what the hash is of that file as it's no longer available to download.
Good call mind you, file hashes are something I never check, but probably should when I'm supplying files to other people. If there did happen to be a virus in there I'd never even know about it (Mac/Linux user with no antivirus installed).