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Definition: A certification by a trusted third party specifying that a particular message existed at a specific time and date. In a digital context, trusted third parties generate a trusted timestamp for a particular message by having a timestamping service append a time value to a message and then digitally signing the result.
Source: High Definition: A-Z Guide to Personal Technology. Boston: Houghton Mifflin, 2006. Credo Reference. Web. 03 August 2012.