When there are folders with music files and a .sfv file, Apex should check the sums in the .sfv file accoding to the mp3 checksums. I know that everyone can upload everything and it won't be corrupted... but the checksums do not match the ones in the .sfv file.
When keeping ID3 data information there won't be another TTH, but Apex does not know the 'original' mp3 file... so a checking method would be very good.