If World War III breaks out, the fate of cryptocurrencies will depend on its scale, the use of nuclear weapons and the extent of infrastructure destruction. If the consequences turn out to be global, the environment will be seriously affected and humanity will be put on the brink of survival, it is unlikely that the cryptocurrency will continue to exist. In the physical world, useful material objects and goods will continue to take precedence. Paper money will depreciate, and there will be a demand for eternal values like gold. If the situation is really bad, then we will return to the usual barter.