and about inefficiency and wasted energy:

what amount of energy is wasted to produce the so called 'real money' ?
what amount of energy is wasted by all those security- and computer-systems that watch over the so called 'real money' and keep track of and allow transactions?
what amount of energy is wasted producing and driving around thousands of big armored trucks with armed guards to transport that so called 'real money' from Alice to Bob?

nothing real is produced by that huge amount of energy.
besides that you even pay your bank and government to waste it, how silly is that?


the small amount of energy needed to keep the bitcoin-network going doesnt even get close to a fraction of that.