Proving the margin of error of a block timestamp In the Bitcoin wiki:


  Block times are accurate only to within an hour or two.


is a bit vague. Is it possible to prove that an arbitrary accepted block timestamp is within x seconds of the real-world time? How?
Block timestamps are whatever time the miner wants to put in there, within some loose bounds, so there isn't a real guarantee.

For more info on what those bounds are, check out this answer:


https://bitcoin.stackexchange.com/a/917/18196