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And even that's assuming whatever the storage medium was for the keys survives that long.

If you were going to store a series of words for up to centuries without being able to check the backup, and without being able to make any changes to protect it, what would you use?

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A couple centuries isn't a terribly long time to preserve something if it's kept in an enclosure in a dry environment. It could be wood. I'm certain it wouldn't be, though.

interesting Q of the schelling point for such a scenario. maybe blockchain / stenography in wikipedia / his original paper/post / usenet

if he kicked off a treasure hunt puzzle through some time-released clue in the future he'd basically be Ready Player One's James Halliday :D

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