Bitcoin 'miners' face fight for survival as new supply halves
KEFLAVIK, Iceland Marco Streng is a miner, though he does not carry a pick around his base in south-western Iceland. Instead, he keeps tens of thousands of computers running 24 hours a day in fierce competition with others across the globe to earn bitcoins. In the world of the web-based digital currency, it is not central banks that add new money to the system, but rather computers […]