As of 7 a.m. Monday, Bitcoin was down nearly 20%, from $63,356 to $51,026, starting at 4 p.m. United States time on Friday. Ethereum fared even worse, falling more than 30% from $3,307 to $2,234. Of course, cryptocurrencies aren't the only ones. Global capital markets are volatile due to heightened economic concerns and geopolitical concerns. In Japan, the Nikkei just experienced its worst day since 1987, falling more than 12%. In the United States, Nasdaq futures fell more than 4% and t...