Open Government Wien has developed one of the first public sector Blockchains: a platform based on blockchain technology, with which one can check whether datasets of the city of Vienna existed at a certain time and whether they have been altered. The city seeks to improve the quality and reliability of the city’s Open Government Data and is experimenting with Blockchain in order to gain experience and explore broader implementation opportunities. This pioneering usage of blockchain for open data archiving is of interest for the community, and members of the project team (Brigitte Lutz) will be keynoting & running a workshop track at the Opendata.ch/2018 conference.