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by speakeron 3053 days ago
> The giant pile of dirt on my back yard is proof that I did hours of hard work with a tea spoon.

It isn't proof: you could have used a digger. The point of Bitcoin-style proof-of-work is that everyone has to use a teaspoon, and if you want to 'go back in time' and rewrite transactions you have to do more work with a teaspoon than everyone else is doing.