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The Wikipedia article Trusted Timestamping states that we can timestamp data by publishing it's hash. Publishing can be done either independently or via a third-party publisher, as explained by DrLector on another thread.

However, can we timestamp data without the capability to publish anything?

What solutions can a person (or a computer) employ to timestamp data if it is not connected to the internet for several days or weeks?

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eprint.iacr.org/2011/553.pdf $\;$ –  Ricky Demer Apr 4 at 23:40
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