 Suppose the solar technology advances very well, it is able to capture a lot of sun energy with very high efficiency. So marginal cost of energy becomes zero, then good the proof of work in that case. That's a good question. Suppose that solar energy advances with its efficiency and you can capture a lot of the solar energy. Would that make proof of work unworkable because the marginal cost of the solar energy is zero? Well, yes and no. Mostly no. Even if you have really efficient solar energy, you have to consider three factors in that. The first one is that you pay for the solar panels, so you have capital costs. The second is you pay for the mining equipment, so you have more capital costs. Competition depends on marginal costs. Yes, but at the same time you are competing against people who are going to apply more and more capital. The third one, and the most important one, is that presumes you have basically no opportunity costs, meaning that there is no other use that the energy could go to other than mining. Meaning that either you so far exceeded the demand for electricity that you have all of this excess capacity. The problem is that at that point we have solved the energy problem of the world. At that point, if proof of work is the one thing that doesn't work, you have gone to a Star Trek universe where money doesn't exist. If you solve the fundamental issue of energy scarcity on this planet, completely solve it. For the marginal cost to go to zero, you have to have zero opportunity costs, which means that you can generate abundant energy anywhere, anytime, and always have excess capacity. You solved much bigger problems. I hope we get there. Then we need someone as brilliant as Satoshi Nakamoto to come up with a new proof of work algorithm. I would suggest Sudoku. It works. Sudoku is an asymmetric algorithm, meaning that if you make the Sudoku puzzle bigger, it still can be verified relatively quickly as to whether it's correct. If you make it billions and billions and billions of times bigger, then it gets really, really hard. You only have to do it on paper with pencil with human beings. That would be a proof of work algorithm, just like the slaves of Egypt who built the pyramids. Solts, Sudoku, hard art. It equalizes everybody, so then it's about access to miners, access to internet capacity, access to storage, to put the blockchain on. They're still costs. You're limited by 2,000 watts per square meter, which is the maximum energy you can get on the surface, which means mining in space. Actually, that's not a joke. There are many reasons why mining in space could become a very interesting possibility. Solar panels, no atmosphere, no obscuring anything. Yeah.