Let A be a unital prime *-algebra containing a nontrivial projection and ? be a nonzero scalar. We prove that a map ? : A ? A satisfies ?(A, B? ?) = ?(A), B? ? + A,?(B)? ? for all A, B ? A if and only if ? is an additive ?-derivation and ?(?A) = ??(A) for all A ? A, where A, B? ? = AB? ? ?BA?.
Kong et al. (Wed,) studied this question.