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Re:Running Bitcoin uses a small city’s worth of electricity by JumpCrisscross on Monday October 02, 2017 @06:36PM (#15388569)
> the biggest cost to sustaining fiat is the power of the sovereign that backs it up

That government and military also safeguards a lot of the economy any financial system, traditional or crypto currency, needs to drive it. In any case, sovereign-less free banking happened [1]. It was replaced for reasons of efficiency.

[1] https://en.m.wikipedia.org/wiki/Free_banking

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