“Digital Currency” Recently, Digital Currency is proceeding, but limited to wallets for purchase. To proceed more, digital currency must be applied to assets classes. Then, paper and coins currency can be invalid. If digital currency is applied to assets and used in smartphones, various types of Bonds and Securities are possible. Digital Currency is associated with Personal Information, and it causes fear and intrust to own government for some people. This problem can be solved by fear to lose money. If paper and coins are invalid, people must use digital currency. To proceed Digital Currency, deleting trust for Bitcoin is good way. Bitcoin is used for dark money, and not in control by trustable organizations. Digital Currency by government can compete Bitcoin if the government is trustable. In addition, Bitcoin has several deep security risk by hackers. Roll back is impossible when hackers steal Bitcoin.
2019/1/31. Kotlin2Swift I am developing the app Swift2Kotlin , which can convert Swift code to Kotlin code. And I also think about another app which can convert Kotlin code to Swift code. Swift is very good language for beginners to develop iOS apps. And Kotlin is also good language for beginners to develop Android apps. So the first language for programming beginners will be Swift or Kotlin. So there may be demands for Kotlin2Swift.