Pat the beef belly completely dry with paper towels.
In a bowl, mix the kosher salt, brown sugar, pink curing salt, black pepper, smoked paprika, and optional garlic powder and chili powder.
Rub the cure over every surface of the meat, making sure it's fully coated.
Seal the meat in a zip-top or vacuum-sealed bag and refrigerate.
Flip the bag daily for 5 days, gently massaging the cure into the meat each time.
On day 6, remove the meat from the bag and rinse off the cure thoroughly under cold water. Pat dry.
Optional but recommended: air-dry uncovered on a wire rack in the fridge for 12–24 hours to form a pellicle.
Preheat your smoker to 200–215°F using hickory, oak, or applewood.
Smoke the belly until it reaches an internal temperature of 150°F, about 2–3 hours.
Remove from the smoker, let cool, then wrap and refrigerate until fully chilled.
Slice thin or thick, depending on preference, and pan-fry, oven-cook, or griddle like regular bacon.