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There’s also the fact that Ethereum has an almost completely different architecture including block times which affect the frequency of mining, different reward structures, etc. As far as I know its not necessarily the difference between Bitcoin’s SHA-256 vs Ethereum’s Ethash as much as it is about the architecture itself.

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There's so many inputs that it's difficult to casually come up with an intuition-guided estimate. So it makes some sense to have faith in the empirically guided value. We hope that they took the time to validate their algorithm for extrapolating the energy consumption.

The trinsicoin algorithm is really just a minimum bound based on the most efficient rigs known for a given algorithm and the cheapest industrial rates for electricity. The Litecoin Foundation actually helped out with some of the math and data resources.

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