Re: The cost in kW
If one person paid for a TfL bus fare by Bitcoin, the transaction would use enough electricity to take that bus to Leeds.
If everyone on a Northern Line train paid for their fare by Bitcoin, all their transactions would use enough electricity to take that train to Napoli in Italy,
That's a very good way of illustrating the folly of crypto currencies, thanks.
I also wonder just how much of global warming was caused by all the power used for crypto coin mining..