Much of the trust in Bitcoin comes from the fact that it requires no
trust at all. Bitcoin is fully open-source and decentralized. This means
that anyone has access to the entire source code at any time. Any
developer in the world can therefore verify exactly how Bitcoin works.
All transactions and bitcoins issued into existence can be transparently
consulted in real-time by anyone. All payments can be made without
reliance on a third party and the whole system is protected by heavily
peer-reviewed cryptographic algorithms like those used for online
No organization or individual can control Bitcoin, and the network remains secure even if not all of its users can be trusted.
Source : Bitcoin.org