What are the events in the QA-grid that allow one to nail down how the brain of a person 50000 years ago was wired? Mind you, we do not even know if such a person ever existed. The "grid" cannot verify anything since thereäs an infinite number of possible persons and brain-states that lead to the same set of events in the grid. There's a limit on what can do known about the past based on incomplete information (and our information is VERY incomplete).
You map known events into it, then deduce all other plot points: we should be able to do all life, and with enough hypercomputing, all the world's environment.
The brain of a 50,000 year old person will have formed in a certain way dictated by his DNA etc and his environment (which includes other people)
This is a vast Grid, but not if you count on vast computing abilities.
I dunno how you get there are infinite numbers of brain states/possible persons, but even if there were, we have Kantorian infinity maths to deal with that. But ur right I'm assuming the possible states are a finite number.
This finite number is whittled down as the grid runs by eliminating impossibles as you deduce from knowns from the records we have inputted.
Yes our information is very incomplete, but that may be enough to describe all the relevant past eg
google a full body and facial reconstruction from a piece of bone of a Neanderthal!
For over a year we've been doing facial reconstruction from DNA alone.
It's normal in Archaeology to have little to work with and yet get great results.
As hypercomputers come, then as A.I. comes in about 2022 resurrections should follow.
One human brain is expected to be reached by 2029 and Superintelligence soon after.