Today's blockchain and cryptocurrency news: Bitcoin is down 2% at $8,313 XRP is down 1% at 26 cents and Ethereum is down 3% at $184 Top gainers in the last 24 hours: Dentacoin up 15% The Central bank of the Russian Federation is not planning on issuing a national digital currency. The Bitwise Bitcoin ETF has been denied by the SEC. The DOJ has charged a Singapore citizen with stealing computing power for cryptocurrency mining.