Hi folks!
Several things I am interested in GrapheneOS to make it trusted phone OS
1. Make Attestation.app to use public blockchain as a source of latest build hashsum to verify OS consistency.
2. Add plausible deniabilty pattern (PIN) screen for several user and remove list of users access from non-admin user.
3. Monetize its development with cryptocurrency (depends on 1.)
Many different things and kind developers needed to implement it, but it will be cool for all of us.  
What do you think about it?