Many times I have wondered how on earth law enforcements etcetera can manage to prove originality of files on the Internet. Not because I have any special interest in the official side of the subject, but (among other reasons) because I have a picture that I am convinced is a forgery - and I don't know how to find the OLDEST version on the 'net, to prove my suspicion right. I don't think it is enough to have a "wayback" version.
Furthermore I think the subject itself is very important. Google (and the other search providers as well) will always offer to order search results > Newest or > Most Popular, etcetera, but never in accordance with OLDEST / ORIGINAL, , so we are always left with the maybe_re-edited version; the maybe_a_lie! Perhaps pro' searchers can make a search engine order the search results the trustworthy way, but I can't. Can you? Is Google even able to search for the oldest file?