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Historical messages, yes. However an app maker can be coerced into adding a hidden user that can participate in chats and receive all future messages decrypted. It doesn't require any special crypto hacks for that to work.

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Signal code is open. You can build it yourself and compare that build with whatever you download from the app store. So it's not that simple.

I don’t think the iOS App Store allows for that sort of checksum comparison.

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