Each new block represents the current marginal cost of power, while older blocks represent the aggregate cost to rewrite the chain through that block. Either way, it’s all about power. Bitcoins value is necessarily supported by the cost of power.

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You're talking about efficiency; power drives everything. You work in 2025, and you buy a vacation 40 years later. That's energy. Use whatever you want to measure things in the middle, but dollars are the worst option.