Bitcoin promises to give the safest and the most confidential transactions to its customers and it not only promises but provides safest transactions to its users and I guess this is the most important reason that why millions of people around the world invest into bitcoin without any tension because they know that they are investing their money at right place as bitcoin transactions does not involve any third party seizure and provides user anonymity and above all in order to be more safe my advice will be that never share your passwords and keys of your wallet to anyone.