As of now, there are no regulations prohibiting the use of virtual currencies in the United States. In fact, the US government recognizes virtual currencies as a legitimate form of payment and investment. However, there are regulations in place to ensure that virtual currency transactions are conducted in a safe and legal manner.

The US government has taken steps to regulate virtual currency exchanges and transactions to prevent money laundering, fraud, and other illegal activities. For example, the Financial Crimes Enforcement Network (FinCEN) requires virtual currency exchanges to register as money services businesses and comply with anti-money laundering regulations.

Additionally, the Securities and Exchange Commission (SEC) has issued guidelines on the regulation of initial coin offerings (ICOs) and virtual currency trading platforms to protect investors from scams and fraud.

While there are no regulations prohibiting the use of virtual currencies in the US, individuals and businesses involved in virtual currency transactions are encouraged to comply with existing regulations to ensure the safety and security of their transactions. It is important to stay informed about any changes in regulations and to consult with legal and financial professionals if needed.