The news comes a week after SIX postponed the launch of SDX for Q4 2020 after previously projecting to roll out the platform in mid-2019. However, on Sept. 23, SIX launched a prototype of its digital exchange and the central securities depository (CSD), noting that the objective of the prototype is to showcase the future of financial markets to the community as well as to demonstrate the integration of CSD with a central order-book stock exchange model.