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I think one of the true purposes is to get us out from under the control of central banks and government controlled money. There may have been a time and need for them in the past, but no longer. They have proven to be nothing more than a bunch of greedy bastards that operate with only their greed in mind and with complete backing of the governments who they control with lobby money and bribes. That would be my top one "true" purpose if I had to come up with a list.