PARIS, FRANCE - FEBRUARY 16: In this photo illustration, a visual representation of digital cryptocurrencies, Bitcoin, Ripple, Ethernum, Dash, Monero and Litecoin is displayed on February 16, 2018 in Paris, France. Digital cryptocurrencies have seen unprecedented growth in 2017, despite remaining extremely volatile. (Photo Illustration by Chesnot/Getty Images)
A customer uses a Bitcoin machine in Old Street underground station in London, as the cryptocurrencie's relentless rise continued on Thursday, shooting past the $16,000 (£12,000) mark and adding to fears of a dangerous market bubble. (Photo by Rick Findler/PA Images via Getty Images)
A Bitcoin machine in Piccadilly Circus in London, as the cryptocurrencie's relentless rise continued on Thursday, shooting past the $16,000 (£12,000) mark and adding to fears of a dangerous market bubble. (Photo by Rick Findler/PA Images via Getty Images)
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