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You could have the camera record the lidar also and crypto sign that too. Assuming it is all done in camera and the lidar is high resolution enough it should be possible to completely tamper proof a video recording at least at the “talking head” level.

I think Apple could possibly start providing this for iPhone videos if they decided to as the hardware is all there already both the lidar sensor as well as the Secure Enclave etc

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I think this idea of adding additional layers is on the right track because it confounds the deepfake generation problem by adding a curse of dimensionality. You can't just fake 2D. You need to fake 3D which is much harder.

I'm curious what the equivalent of "3D" to "2D" will be for deepfaked voice would be.

There is already the color channel dimension in addition to the spatial dimensions and time dimension. Adding depth doesn't make things much harder, especially because there is so much correlation between depth and color and time.

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