NEW YORK: Cryptocurrency exchange COINBASE made a dramatic stock market debut Wednesday amid frenzied interest in bitcoin and other virtual currencies despite concerns about a bubble. The enterprise, the first company devoted entirely to cryptocurrency to enter the US stock exchange, debuted on the market well above its reference price and quickly rocketed higher before pulling back somewhat. The premier “went successfully,” said Art Hogan, chief market strategist at National Securities. “We’ll have to see how this plays out and then see if this particular publicly traded stock is as volatile …