Most of the trust about bitcoin from a fact: it doesn't need any trust. Bitcoin is completely open and decentralized, which means that anyone can view the source code at any time. So any developers around the world can work principle for precise verification of bitcoin. Anyone can real-time clearly query all bitcoin transactions and issued the bitcoin. All the payment does not depend on the third party, the protection of the whole system is composed of a large number of cryptography expert review before, such as those for online banking algorithms. No organization or individual can control bitcoin, but if not all the users are trusted, the bitcoin network is still safe.