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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.

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  • Was the mining software integrated with the bitcoin client or something, or was there any notable open source CPU mining software?
    – Kiril
    Mar 14, 2013 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, 2013 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.
    – makerofthings7
    Mar 20, 2013 at 15:53

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