Like any other currency, bitcoin design allows its users in a privacy acceptable degree of pay and receive payment. But bitcoin is not anonymous, so I can not provide the same level of privacy and cash. The use of bitcoin will leave many public records. There are many kinds of mechanisms can be used to protect the privacy of users, and more are in development. However, there are in the effort to put most of the bitcoin users correctly use these functions before.
Some people worry that private transactions bitcoin can be used for illegal purposes. It is worth mentioning that bitcoin will undoubtedly play a role by similar provisions in the existing financial system to have. Bitcoin will not have more anonymity than cash, and is unlikely to interfere with a criminal investigation. In addition, the design of bit the coin is in order to prevent large-scale financial crime.