Bitcoin, Ethereum and Tether are among the digital currencies approved. On Tuesday, the Central Bank of Russia (CBR) announced the cryptocurrencies authorized for public transactions on exchanges. Qualified investors, by contrast, will be able to purchase all cryptocurrencies traded on exchanges or other markets without restrictions. Before beginning transactions, all investors, regardless of their status, will have to undergo tests and learn about the risks of investing in cryptocurrencies, the CBR added. Only specialized intermediaries will be allowed to engage in such digital transactions, namely transaction organizers, brokers, asset managers and digital currency exchange platforms.