BUILDCHAIN will create a scalable BIM-based decentralized knowledge platform to digitally identify, register, update, and analyze massive amounts of data related to the overall life-cycle of buildings based on Origin Trail Decentralized Knowledge Graph. The BUILDCHAIN project will design and develop its own Digital Building Logbook solution for the integration of building data and knowledge, and the inclusion of new applications and functionalities dealing with integrated information, efficiency, circularity and transparency to improve the building stock, facilitate informed decision making and its validation.