“Mining a Bitcoin is hard for a typical computer to do. A computer has to solve a series of difficult cryptography problems and most computers don’t have the computational power to do that. So companies like KnCMiner developed special Bitcoin computers using custom computer chips. (Such chips are called ASICs which stands for ‘Application-Specific Integrated Circuit.’) These computers do only one job: mine Bitcoins. We asked cofounder Andreas Kennemer about the business of Bitcoin computers.”
http://www.businessinsider.com/guys-made-3m-from-bitcoin-craze-2013-11
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