The paper talks about how to achieve this, need a modification to identity key exchanges and a new peer ricochet channel that gets set up to do the syncing.
seems something like a QR code with what is needed to copy the identity or a link and code to allow a new peer to connect to the original identity peer and get that info should be pretty not hard
messages is no problem as they both fetch them
keeping groups subscribed to and peers peered with up to date and synced seems like a challenge tho?
this decision will have tremenous impact on the ux of most cwtch applications and requires careful consideration. i like the paper's idea of establishing proof of shared identity but there are subtleties to how synchronization should be implemented. i'd like to take a stab at designing this, given that it's my thesis topic and all 0:)
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