At the center of the project is a platform customized for the management of digital twins, which we call Twinbase. The platform enables vendor-independent management of digital twins based on standardized ways of describing digital twins. There are several different standards and specifications suitable for describing, and we call their use the digital twin description document method. However, the twin description document method is not yet established, so twin documents are studied both methodically as well as through application to practical digital twins. The applicability of ontologies and identity technologies to the twin document method is also studied and developed, and user interface research is carried out to present the information and functionalities offered by the document method in an optimal way. The project maps pilot customers and ensures the platform's suitability for managing their digital twins. The goal of the project is to prove the usability of the method in practical tests and create a basis for starting business around the platform.