Update (June 15): Cyberwire on Google Play App Store
Cyberwire is an open source proof-of-concept for OpenTransact on Android. In the screencast, we see the Android app used to transfer 10 imaginary coffeebucks using one OpenTransact provider implementation. Even with a different OpenTransact provider implementation, we see the same functionality accessed by the same Android app.
OAuth Dynamic Client Registration Protocol is used to allow the Android app to start communicating with a new OpenTransact provider. A custom application_type request parameter is set to "noredirect" to indicate to the provider that instead of the client providing its own redirect_uri, the provider should choose a uri within its own domain and after authorization, the client will snarf the authorization code parameter from that uri instead of its own.