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According to https://en.bitcoin.it/wiki/Bitcoin_Days_Destroyed , if I have 100 BTC for seven days and then spend them, that’s 700 days destroyed.

But if I didn't have them, someone else would have them. So how does the metric differ from the amount of BTC that exists?

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Days destroyed are measured in BTC * days Amounts of BTC are measured in BTCs

The two concepts are as different as Power (Watts) vs Energy (Joules).

  • Understood. But one is linearly proportional to the other. So why do we need both? With power and energy, we’re usually dealing with a subset of the set of devices or of the supply, so the difference is meaningful. No doubt there’s some other detail I’m missing. – WGroleau Mar 3 '14 at 2:59
  • Not true. The UPPER BOUND of Days-destroyed is linearly proportional to the total amount of BTC in existence. But if no transactions occur, then Days-destroyed will not grow. – uminatsu Mar 3 '14 at 3:31
  • “no transactions occurring” is a hypothetical that will never happen. So days destroyed correlates to the amount not being spent? Wait, that still sounds like what I said before. I guess I still don’t get it. – WGroleau Mar 22 '14 at 15:47

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