The IHK Munich has developed a block chain solution for authentication of digital documents, which will be used for certificates in the future. In cooperation with the Bavarian Ministry of Digital Affairs, a blockchain-based web application for digital proof of document authenticity has now been published. This provides companies with a tool that can be used, for example, to check the authenticity of training certificates, as proof of authenticity is considered a classic blockchain application. It is remarkable that a number of German universities in the DACH region are already using the verification of certificates using block chain technology.