Vegan Chocolate Cheesecake

Name: Vegan Chocolate Cheesecake
Ingredients: 1 1/4 cups chocolate or regular graham cracker crumbs (from nine 5-by 2 1/2-inch graham crackers); 3 tablespoons sugar; 4 tablespoons Earth Balance vegan buttery spread, melted and cooled, plus additional for greasing pan; 2 1/4 cups sugar, divided; 1/3 cup water; 8 ounces bittersweet chocolate (no more than 60% cacao), chopped; 2 (1-pound packages silken tofu, drained; 1/4 cup unsweetened cocoa powder (not Dutch-process); 2 (8-ounces) containers soy cream cheese at room temperature; 1 teaspoon pure vanilla extract; Rounded 1/4 teaspoon salt; Equipment: a 9-inch springform pan