The world of technology is evolving every year what if in future a new tech is been born that can kill crypto or works better than crypto won't this kill cryptocurrencies?
Also I heard that super computers can get through all crypto wallet keys easily in a matter of days, true or false?
I have just answered another similar question just an hour back. First of all, I am surprised to see people really think that Bitcoin or cryptocurrency is the end of currencies like we will always now use this technology in our economy. This is a wild thought in itself, FIAT too came one day and people thought that this is it they have a solution that will last forever but technology gave us crypto a better alternative, so obviously a time will come when even cryptocurrencies would get old and there will be a new technology which will replace it and replace our way of transacting with each other. Will it Kill crypto? yes, it will but definitely, in a positive way, it's not that you will lose all your money and that stuff. Should you be worried? Not at all, I don't see such strong supercomputers coming in for the next 20 years which could overtake crypto.