Coinbase is a virtual currency exchange where consumers can purchase Bitcoin. Many people buy Bitcoin because this currency is supposed to provide privacy to consumers. 

If you have any offshore financial accounts, you are required to file a Report of Foreign Bank and Financial Accounts (FBAR) to alert the Internal Revenue Service to your foreign investments. A failure to file FBARs can led to financial penalties, which in some cases have exceeded the value of the money kept in the foreign account. 

The Internal Revenue Service and the Justice Department have been making a major effort to crack down on offshore accounts that U.S. citizens do not declare. In addition to allowing tax payers to face reduced penalties if they voluntarily report these accounts through an Offshore Voluntary Disclosure Program (OVDP), the authorities have been making deals with Swiss banks to turn over information on accounts in exchange for lesser penalties or avoiding prosecution.