Sidhartha Krishna T. (born on December 30, 2002) of Kerala, India, is titled as ‘Grand Master’ for making a portrait of actor Mammootty with stamped thumb impressions. He made a portrait of the famous Malayalam actor Mammootty (measuring 42 cm x 29 cm) by placing numerous stamped thumb impressions onto a single A3 size sheet, as confirmed on June 9, 2021.