 FACT: In the movie, the address given to the Germans of the hiding  place over the telephone by the supposed informer is incorrect. The  informer says the address is 263 Lindtstradt, but was actually 263  Prinsengracht. It still exists today as the Anne Frank House museum  in Amsterdam. The real betrayer of the hiding place has never been  revealed or proven beyond only circumstantial evidence. The informer  depicted in the movie is based on the belief of Melissa Muller, who  wrote the book (Anne Frank: A Biography) that the movie is largely  based on. In her book "The Hidden Life of Otto Frank" by Carol Ann  Lee, which was published in 2002 and revised in 2003, an entirely  different theory as to the identity of the informer is presented.  Officially, the identity of the actual informer that betrayed those  in the hiding place has never been conclusively determined and most  likely never will be, as most of those that would be able to shed  more light on the subject have since died.