How did you estimate an exabyte for the information content of a human?

Googled it. If I had to guess why the number I found was so much smaller, it's probably because they had a scheme more like "for each molecule, describe it and place it with precision much better than its thermal vibration," and maybe a few bits to describe temperature.

But yes, even 10^your number of bits will be smaller than 10^^5. Even if we tracked each possible quantum state that's localized in my body, which would be exponentially more intensive than tracking individual particles, that just means we might have to (but probably not) bump up to a reward of 10^^6 in order to swamp my prior probabilities.