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I am compiling some documents on a proof of concept. I want to find an authority that could store a document and certify in the future that:

  • I am the author of said document.
  • The date at which the document was uploaded has not been tampered with.
  • The document remained unchanged since.

Is there a website that can act as such an authority?

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up vote 3 down vote accepted

Try some timestamping services online. They'll digitally sign a timestamp. You get both free and paid for services. To get you started, have a look at these:

For more info, read the wikipedia article on the subject. You'll have to choose a service that answers to your needs. (that will depend on a lot of factors that only you will know)

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