Lightning at 34c3
WallETH at DevCon3
You can find the Slides for both talks here.
Talk at DroidCon Berlin 2017
Here you can find the session description.
Also shortly in the DroidCon 2017 Recap
Talk about WALLETH at Berlin Ethereum meetup June:
You can find the slides and more information here.
Talk about espass at Berlin Ethereum meetup January:
Lightning-Talk about espass at 33C3:
Deutsche-Welle on PassAndroid: