There are true believers in bitcoin, but others warn the bubble could burst


NEW YORK — It is the hottest currency in the world: the bitcoin. In the past 12 months, investors have driven the value up nearly 1,500 percent. There are true believers, and others who warn the bitcoin bubble could burst.

At a New York City bar, the drinks are flowing — and so is the conversation about bitcoin. “I think bitcoin is the future of currency,” one patron said.

“What it…