Signal is a messaging app with a focus on privacy. This is a shared trait with Grin. The project is currently testing integration of a cryptocurrency called MobileCoin, which is also a privacy coin. According to wikipedia it is similar to Monero, but how deep those similarities go I’m not sure.
I got inspired by the post from @aixinrock about using email as a transport layer for Slatepacks, which made me think that integration into the Signal messaging app would be a good supplementary alternative. Some of the UX challenges with interactive transactions could be mitigated by automating the communication of Slatepacks within a Signal conversation.
Furthermore, Grin’s scalability and blockchain size would make it feasible to run a full node on a phone alongside the Signal app.
Since Signal is currently beta testing their MobileCoin integration (only in the UK), I’m sure they’re too busy to add something like this now, but I wanted to share the idea. Alternatively, perhaps an existing mobile app for Grin could use and monitor Signal to send and Slatepack communication.