https://www.cnbc.com/2017/12/08/coinbase-was-top-of-us-apple-app-store-after-bitcoin-price-surge.html >Bitcoin exchange Coinbase briefly flew to the top spot on Apple's U.S. app store after the cryptocurrency skyrocketed in price Thursday. >The red hot digital currency surged to a record $19,000 on the online broker's site, before dipping 15 percent to $16,025 at about 4 a.m. ET Friday.