"why not?" - because your procedure/application won't be suitable with international methods like Ethereum or Bitcoin the place ensuring uniqueness of addresses on a world scale would be the a major aim. This can be the problem you need to be asking - (ethereum.stackexchange.com/questions/3542/�? Furthermore, sending ETH using a paper https://tron-address-generator00087.blogvivi.com/31307366/new-step-by-step-map-for-copyright-vanity-address