About a half-billion dollars worth of it vanished from an online exchange in Tokyo. A prosecutor in Manhattan arrested the 24-year-old vice chairman of its most prominent trading body on drug-related charges of money laundering. Its founder's identity remains a mystery, and last year, it shed two-thirds of its value, losing an additional 44% in just the first two weeks of January. In his year-end letter to investors, Warren Buffett's advice about it was emphatic: "Stay away." 

The digital currency known as bitcoin is only six years old, and many of its critics are already declaring it dead. But such dire predictions miss a far more important point: Whether bitcoin survives or not, the technology underlying it is here to stay. In fact, that technology will become ever more influential as developers create newer, better versions and clones. 

No digital currency will soon dislodge the dollar, but bitcoin is much more than a currency. It is a radically new, decentralized system for managing the way societies exchange value. It is, quite simply, one of the most powerful innovations in finance in 500 years.