Replying to Avatar Sirius

They can only see message history as far as the linked device allows and can't see future messages if the device unlinks. I don't know the exact details how Signal does this, but I don't think its forward and backward secrecy is broken because of the feature.
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Sirius 1y ago

Actually even without device linking, I'd rather use forward-secret messages even if they're out of sync with some other client.

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Vitor Pamplona 1y ago

As long as you never let the ratchet state be exported from the main client, you should be fine.

But that blocks people from using multiple DM clients, which is a core motivation behind Nostr. You are blocking users into your client and locking them out of others. Same data silos Twitter and Facebook gave today.

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Keychat 1y ago

If Alice has two phones and Bob has one phone, and Alice's two phones have different Keychat IDs, when Alice chats with Bob, if she feels it necessary, she can create a pairwise group with her two Keychat IDs and Bob. This can achieve multi-device synchronization to a certain extent.