"It is important to realize that while distributed consensus is a hard problem, ordinary consensus is much easier and better studied, and can be solved some trillions of times more efficiently by use of trusted identifiable signing parties. Therefore, cryptocurrencies which compromise by introducing trusted parties, even under limited circumstances, should consider whether their new trust model is one for which consensus is easily achieved by some other mechanism."

— Andrew Poelstra (On Stake and Consensus, 2015)

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