These wormholes are time machines that do not violate causality. We travel in time to the past, parallel universe and the future, when there is a jump through a singularity in the interior of a rotating black hole-where all universe layers meet. The very same mechanism that creates black holes produces whiteholes. One difference between the two is that the time sequence is reversed. At the quantum level there is no such thing as a direction of time, such as past or future.
All events occur and exist simultaneously.
A quantum foam contains wormholes that function to connect any event with any other event. Whitehole time sequence are opposite from those of black holes. We would observe a universe on the whitehole side running back in time. The inhabitants of this whitehole universe would be oblivious to this, as for them everything would be proceeding normally. To our eyes, it would appear as a movie running in reverse.