China has launched a trial run of a digital wallet app for iPhone and Android that allows users to store and pay for items or services with digital currency. China's e-CNY app. Credit: Diglogs The digital yuan currency that the app supports was developed by China's Digital Currency Research Institute as a replacement for Chinese banknotes and coins, the South China Morning Post reported Tuesday. Previously, the free e-CNY app was only available via private links, but can now be downloaded by the public. However, new registrations for the service are limited to Chinese cities that are undergoing digital yuan…