Bitcoin, the landmark digital money and financial technology, has spawned a global social movement with utopian ambitions. Believers from Beijing to London see the potential for a financial system free from banks and governments, and a new global money for the digital age. With Digital Gold, Nathaniel Popper offers an engrossing account of this new technology, filled with dramatic booms and busts that have led to untold riches for some and prison terms for others. At each turn, Bitcoin has provided a test of how money works, who benefits from it, and what it may look like in the future.