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I want to run bitcoind to interact with the daemon, but having bitcoin download new blocks and verify them is taking a toll on my CPU. I do not want the latest data - I just want the daemon to be running. Is there a way to prevent bitcoin from downloading new data?

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    Use the -proxy option with some not existing proxy. – Jori Apr 16 '14 at 15:17
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Essentially, you want to run bitcoind while connected to the network to download all the blocks, then disconnect it from the network so it no longer downloads new data. There are several possible ways to do this, from least to most drastic:

  • Use the -proxy option to specify a proxy that does not exist.
  • Use a software firewall to prevent bitcoind from communicating with the network.
  • Run bitcoind in a virtual machine and turn off its network access.
  • Physically disconnect the machine from the network.

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