"At any point in a work of art's history, its authenticity can come into question. Often, art is accompanied by documentation, commonly known as provenance, that confirms its authenticity mainly through ownership history. Good provenance (ownership history) leaves no doubt that a work of art is genuine and by the artist who it is stated to be by or whose signature it bears. Unfortunately, numerous forged or otherwise misrepresented works of art are offered for sale with fake or questionable provenance at online auctions, at fixed-price art websites, and at bricks-and-mortar establishments. But nowhere is the proliferation of art with problematic provenance more pervasive than at online auctions.
In order to fool inexperienced buyers, unscrupulous sellers often say they have provenance or documented ownership histories that they claim confirms the authenticity of bogus art. In some cases, this concocted provenance appears to date all the way back to the original artists themselves. Before bidding on or buying any art, your job is to make sure any such provenance offered by sellers is correct, legitimate, verifiable and does in fact attest to the authorship of the art. (Problem art may also be accompanied by questionable Certificates of Authenticity. To evaluate a Certificate of Authenticity or COA, read Is Your Certificate of Authenticity Worth the Paper It's Printed On?)
As for you artists, firmly establishing yourself as link number one in the chain of provenance is essential. These days, proof of authenticity or authorship accompanying a work of art is more important than ever. In order to prevent unscrupulous sellers from trafficking in fakes, and avoid situations where people question your art, keep good records right from the start and provide some form of documentation with every artwork you produce. The last thing you want is people trying to figure out whether or not you actually created certain works, or contacting you with requests to authenticate works that have no accompanying paperwork or documentation. The bad news is that in the long run, repeated incidents surrounding undocumented art can actually compromise your market. So make sure there's never any doubt that ownership of your art begins with you. Read more about how to do that in this article about How to Authenticate Your Art."