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According to the Bitcoin history, the OpenCL miner was released publicly in October 2010. How was mining done before that? There were about 4 million coins mined until then, so there must have been some mining software out there. Any ideas on what was it and how did mining work in those early days?

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Before GPU mining all mining was done on the CPU.

  • Was the mining software integrated with the bitcoin client or something, or was there any notable open source CPU mining software? – Kiril Mar 14 '13 at 4:11
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    @Lirik The very first bitcoin miner was in the standard client, and it is still the reference implementation. However, it's disabled, because CPU mining is so inefficient. – Nick ODell Mar 14 '13 at 5:23
  • @NickODell CPU mining isn't disabled. Its off by default and hidden in the GUI. I can open the debug console and mine on the TestNet with no problems. – goodguys_activate Mar 20 '13 at 15:53

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