We humans exist in and are a part of nature. Everything we do is governed by the laws of nature and is by definition natural. We could no more destroy nature than a javascript app could kill javascript.
I think you are equating nature with pre-existing conditions. Anyway, your argument doesn't interest me. If you have a better way of building a cryptocurrency, just go do it.
It is insane to waste energy on mining bitcoin in the age of peak oil where greedy energy companies destroy nature for profit.
And only a king can destroy a monarchy? Of course not.