janet yellen, treasury zack greinke -- treasury secretary, not a fan of cryptocurrencies.ler of the sec in america, the most important regulate knows a lot about cryptocurrencies and used to even lecture about them. people were optimistic he would be a big fan, but he got his new job and it is clear he wants to regulate, and in ways people might not like who work in the industry. all it takes is one excuse to clamp down, a good excuse. th -- they used to use terrorism funding and that it facilitates crime and all of that, but those arguments were easily refuted by saying nearly all crime is financed by dollar notes, suitcases full of money. now, they have got the better excuse, the environmental one. bitcoin does use a lot of electricity. i take john's point about how the banking system also uses a locked up electricity, but the problem at the moment is that bitcoin doesn't actually do much that is useful like the world banking system does. it facilitates all these incredibly useful transactions, the banking system, that keep the world economy going. bitcoin doesn't do tha