Is the President-Elect blackmail-able over his birth certificate?

It IS cause for concern that the President-Elect is hiding his birth certificate and the logical questions presenting themselves are, why is the President-Elect hiding his birth certificate?, and Is the President-Elect blackmail-able over his birth certificate? I submit that there is a legitimate public interest in the birth certificate of the President-Elect. Is the truth about his birth what he wrote in his autobiography, Dreams from My Father, or what he said at the last Alfred E. Smith di