In computer security I've often heard the saying there is no security without physical security. This means if somebody can access the hardware running your pro

In computer security I've often heard the saying there is no security without physical security. This means if somebody can access the hardware running your program you can't trust the outcome. That's why you have to lock your servers away and trust the people who have the key. Ethereum solves this problem by creating truly virtual machine that does not have physical location. If somebody wants to tamper with the execution there is no address to drive to or datacenter to cut power from. Even service providers themselves can prove that they have locked themselves out. Without ethereum you just have to take their word for it. This all comes with caveats. Radical transparency, everyone can see your code and when it is running. Cost, you need to pay for every instruction to keep the system running and to prevent spamming. It's a shared resource, you need to wait for your turn and the computer is very slow. Is there usecase for such contraption remains to be seen.