The United States is likely just a few years away from implementing a national digital currency, according to analysts at Bank of America.

The idea of digital coin issued by the US government, known as central bank digital currencies (CBDCs), have gained prominence in recent years alongside the rise of leading crypto tokens such as Bitcoin, which isn’t tied to any government institution.

US-backed digital coins “are an inevitable evolution of today’s electronic currencies,” Bank of America crypto strategists Alkesh Shah and Andrew Moss wrote in a client note on Monday, according to Bloomberg.