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My motivation is that I have a number of signed works (and I assume so do lots of others) and in some cases I'm never sure if it's a genuine signature (autograph). I would be willing to post images of my signed works (at least the signatures) many of which I KNOW are genuine (because I was there when Bruce Campbell signed it!) but others, not so sure.
Might be an interesting additional field linked to by the official author page.