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I would guess consuming the amount of wood required to implement such a transaction history might end up proving to have disastrous results on the environment.

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But proving you have a stake doesn't take that much work, right?

to prove that, you had to rub the block as fast as possible. this heat generated was then used to heat the houses

The original "block chain"

Yes, and the people using it were the original "block heads" :)

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