True, it is far from clear that anytime soon a full-fledged digital currency (be it blockchain based or not) will be created by a central bank (some of you may be following the debate in the Riksbank in Sweden), but the last three years have seen an explosion of research on this idea in many central banks. Bitcoin must be credited for this powerful intellectual stimulus. When so many professors at the most esteemed universities of the developed world are not thinking about potential reforms of the current monetary order, we have received a stimulus from the libertarian IT guys instead. Fine. To be sure, a hypothetical digital currency issued by a central bank may have very little in common with the cryptocurrencies that currently exist. These two things are mixed up quite often in the public space. Cryptocurrency is in fact a different concept than a digital currency of a central bank and yet a different concept than electronic money such as pre-paid cards. They are all digital in one way or another, but they are conceptually separate. Central bank digital money does not have to be based ultimately on a blockchain at all, but, to enable price stability, it will certainly be linked to the value of conventional elastic currency. To keep the current system of elastic money working, even the concept of central bank digital currency will have to allow the amount of money to change, not to be fixed or constant over time.
May I conclude by extending my warmest congratulations to all of those involved in taking forward this important project. I hope that this project will prove to be a success and I look forward to further cooperation in the future with all who have an interest in developing the debt market in Hong Kong and in the region as a whole. BIS Review 84/1999  2