I don't know anything about KFC's hot chicken. That's not the Nashville hot chicken I'm referring to. This is a good description of the Nashville hot chicken I am referring to.
"Hot chicken or Nashville hot chicken is a type of fried chicken that is a local specialty of Nashville, Tennessee, in the United States. In its typical preparation, it is a portion of breast, thigh, or wing that has been marinated in a water-based blend of seasoning, floured, fried, and finally sauced using a paste that has been spiced with cayenne pepper. It is served atop slices of white bread with pickle chips. It is both the application of a spicy paste and the presentation that differentiates"