NOTRZR is an App, which allows to establish proof that your were in possession of information and data at a certain point in time. The App makes use of the unique feature of blockchain to maintain a tamper proof timestamp of everything that is written. In addition it uses a cryptographically secured way to proof authenticity and origin of the data. Writing data to blockchain is usually a difficult task, but with NOTRZR it becomes simple and can be performed by anyone without the need of a third party. The App allows to take snapshots or upload files and proofstamp them on blockchain. In combination with the Web Application of NOTRZR, which requires neither login nor any installation to view and read data, the App is a powerful tool for privates and businesses alike to create all kinds of documentation that need a reliable timestamp and might require proof of authenticity.