Time stamping documents can provide valuable benefits. In a patent dispute, it is often necessary to prove that the protected invention was not new or not inventive over the prior art. In many cases, there is no written evidence that the invention was known prior to the filing of the patent in suit. However, there are often plans, drawings or photographs showing the invention. In order to use this evidence, it must be possible to assign an unquestionable date of origin to these documents. With our blockchain-based timestamp service, we can date your documents accurately and tamper-proof, and subsequently prove that these documents existed on the assigned date.