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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?

marked as duplicate by Murch, dchapes, Salvador Dali, Greg Hewgill, John T Mar 4 '14 at 5:31

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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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