Wanksy or Banksy?

Did he really steal it or is it a fake? Who really cared if the alleged Banksy piece was genuine? It was once on the Shorditch Bridge and now is residing above the Green Frog off Carnaby St. I cant wait to see the film that has been made telling the piece's story and see if it actually sold to the highest bidder.

(Photo courtesy of N.Farley)