Digital currency exchange NiceHash says bitcoin worth nearly $64 million hacked

(Reuters) - Cryptocurrency marketplace NiceHash said the contents of its bitcoin wallet had been stolen in a security breach and one executive said nearly $64 million had been lost. FILE PHOTO: A copy of bitcoin standing on PC motherboard is seen in this illustration picture, October 26, 2017. REUTERS/Dado Ruvic/File PhotoNiceHash head of marketing Andrej P. Škraba told Reuters on Thursday that the hack was “a highly professional attack with sophisticated social engineering” and that about 4,...