This photo illustration shows a Vietnamese cryptocurrency investor looking at the latest Bitcoin values on a smartphone in Hanoi on April 12, 2018. Vietnam has vowed to tighten regulations on cryptocurrencies as authorities investigate an alleged multi-million-dollar fraud in the country, where digital units are traded in a shadowy and unregulated market. / AFP PHOTO / Nhac NGUYEN (Photo credit should read NHAC NGUYEN/AFP/Getty Images)
