Gluten Free No Bake Chocolate Cheesecake

For the crust 1 1/2 cups (225 g) gluten free crunchy cookie crumbs

unsalted butter, melted

For the cheesecake 6 ounces bittersweet chocolate, chopped

heavy whipping cream, chilled (plus more by the teaspoonful as necessary)

 cup (115 g) confectioners’ sugar

unsweetened cocoa powder (preferably Dutch-processed, but natural works)

cream cheese, at room temperature

kosher salt

Shaved chocolate, for decorating (optional)