Whisk together salsa, peanut butter, orange juice concentrate, soy sauce, honey, ginger root and curry powder in the crock of a slow cooker. Place chicken thighs over sauce. Turn pieces to coat both sides with sauce. Cover and cook on low heat setting for 5 or 6 hours or high setting for 21/2 to 3 hours, until chicken is tender. Garnish chicken with chopped green onions and chopped peanuts , if desired.