Bitcoin flash is no longer a strange language to quite a number of people here anymore. Bitcoin Flash can of course be done in both Atomic and Electrum Wallet. However most apps and software that claimed this before now doesn't work and the one's that works are very hard to come by .... Now, as a programmer how do u develop a program that flashes the blockchain network? Test coins of any crypto cannot by any chance be flashed so coins that are flashed are not from test coin network. If u want to learn this you can chat me from my contact in my previous posts.