Yummy Blueberry Cheesecake

Graham Cracker Squares, crushed (or digestives – about 10 – roughly 1 1/2 cups when crushed) 1 (2.5 – 3oz) packet of Pecans or Walnuts, crushed (roughly 3/4 cup) 1 Tablespoon Sugar 6 Tablespoons unsalted Butter, melted