  In construction, BIM (Building Information Modeling) promises to increase
quality of data and to provide a shared, uniform view to all parties. While BIM
tools and exchange formats exist, the distribution and safeguarding of data is
an ongoing challenge. Distributed Ledger Technology and Blockchains offer a
possible solution to this task, and they promise quality attributes such as
tamper resistance, traceability/auditability and safe digitalization of assets
and intellectual property. However, the practical application and adoption of
Distributed Ledger Technology in the built environment requires a good
understanding of tool maturity, performance and standardization. Also,
user-oriented integration of BIM tools with the blockchain backend needs
attention. The contribution of this paper is an overview over both industrial
and academic progress at the intersection of BIM and blockchains/DLT.
