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This is so that a version history can be maintained along with the work that accurately proves when the particular version was published and proves that the particular version is untampered with.
A published document, can be signed by others as well if peer review is needed. I think this is a good way to do research.
A trusted digital timestamp is EVIDENCE that the work existed at a particular date. The trusted timestamp is independently issued by an organisation that certifies it (in this case Digistamp)
A Digital signature is EVIDENCE that the document is indeed from the person that has signed it. The identity of the person signing the document is independently verified by the organisation that issues the Digital ID (in this case GlobalSign)
You need to install the following certificates to be able to validate the signatures properly: