CARDIFF, WALES - MAY 03: A visual representation of the digital cryptocurrency, Bitcoin on May 3, 2018 in Cardiff, Wales. Cryptocurrencies including Bitcoin, Ethereum, and Litecoin saw unprecedented growth in 2017. Bitcoin works without a central bank - instead using a network of peer-to-peer nodes that verify transactions which are recorded in a ledger called a blockchain.(Photo by Matthew Horwood/Getty Images)
