I guess NFC only removes web site step. Meanwhile small producers on unique goods can use barcode approach. Isn't that sweat idea for new startup?
this requires a mean to identify where the unique good is (if it exists at all). would rfid fix this? hmmm shrug
E.g. in web system you can assign owner to barcode (product). Different scenarios if owner is known before purchase or assigned later. All other trials to validate product id as unique should fail and client might request return of money.