Will digital editions become the art world's new headache?

"Once files start floating around in cyberspace, the certificate of authenticity becomes paramount. And what if that certificate gets lost? That's precisely what happened with a Dan Flavin neon-light piece recently offered at Christie's London. Estimated at roughly $83,000 to $117,000, it had to be withdrawn from the sale because the owner mislaid the certificate and Flavin's estate would not issue another."