How do you timestamp a written document? So that it can be used in a court of law if you seek to get compensation for a stolen intellectual property?
For those seeking compensation for intellectual property infringement, the United States court system only accepts a single source of "timestamps": the Copyright Office. The registration process can cost as little as $35 dollars.
For more information see my answer to Is emailing an original idea to oneself using Gmail a foolproof way to timestamp it?