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by an27 3275 days ago
Isn't it the other way around?

I can prove I had today's papers today, but once I've seen it I can prove it any day. So you can say "this information existed at day X or earlier".

There's also the issue of proving the content you hashed actually came from the place you say it came from. To me it seems that would require proofs of authenticity, by the source itself; not something that's easy to come by.