Bitcoin 'miners' face fight for survival as new supply halves

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 like Streng's which are awarded fresh bitcoins in return for processing blocks of the latest bitcoin transactions. Bitcoin can be used to send money instantly around the world, using individual bitcoin addresses...

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