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HankronWhile many fakes and forgeries can be identified from an online image, one can't and should not even attempt to authenticate something from a scan. Considering that images are regularly manipulated or accidentally photograph different (darker, lighter, off color, etc) than the real item, and sometimes the image is stolen and the person doesn't even own the item, an 'online authentication servce' would be, in my opinion, bogus. There's no way around the fact that one can only authenticate an item by seeing it in person.