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Maybe the reverse makes more sense. Wallet sync could be done by sending messages to other devices which only have on-device keys.
Anyway, I started out of my depth and went deeper. It should be a fun tab to keep open with Chat either way. Thanks for the motivation!
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It's perhaps naive but I was thinking we would hold the messaging keys in this vault as a backup of whatever we store on the device. Then there's at least some redundancy if the vault needs to be reset or the device gets wiped.