Place chicken wings in a large slow-cooker.
In a large bowl, mix together soy sauce, brown sugar, garlic, ginger, cayenne pepper, and black pepper. Season with salt, then add cornstarch and stir until mixed. Pour over chicken and toss to combine.
Cover and cook on high until cooked through, 2 ½ to 3 hours.
Heat broiler. Line two baking sheets with parchment paper and pour wings onto them. Broil until crispy, 5 minutes.
Sprinkle with sesame seeds and serve.
