Banksy’s handling service Pest Control Office has created one of the most efficient certification systems in the art world. They have also been active in the second-hand market as an intermediary between sellers and buyers of Banksy’s certified prints and unique studio work. (This has nothing to do with street-art pieces.)
Now it seems like they are taking it to a new level with the announced launch of http://www.Bbay.shop. It is an interesting development for the booming secondary market in Banksy artwork and will hopefully set a new standard for transparency in the art market.