In a medium saucepan whisk together cocoa powder and sugar until well combined, then slowly add coconut milk, whisking constantly, until a thick, lump-free paste forms. Whisk in remaining coconut milk and add coconut cream and corn syrup, then cook over medium heat, stirring frequently, until mixture comes to a simmer. Transfer mixture to blender, cover very tightly, and blend for 30 seconds. Pour into an airtight container, stir in vanilla extract and whiskey, then add salt to taste.
