I mined Ethereum early on and managed all kinds of wallets for personal and company use. The blockchain technology behind the transaction history for crypto is second to none, absolutely amazing. I am very fearful of the stranglehold that China has on main cryptocurrencies, like Bitcoin and Ethereum, though. Last I checked there were over 1,600 different crypto coins out there of various usage and means to acquire. For the big main ones, you need tons of electricity and computer hardware to mine. China has very little regulation on environment and power consumption. They also manufacture the ICs and hardware used to mine. Chinese people have been mining massive crypto for a long while. The US has tariffs on imports from China, so even more reason for computer hardware to stay within China and mine more than anyone else. People do like the idea of moving to crypto but they underestimate how much of it is already contained and owned by China. Bitcoin and Ethereum will pave the way for people to understand how it all works but I doubt it will be the final currency. Good chance that a new world currency will employ blockchain tech though, which will be an upgrade.