The use of Digital Yen is currently being tested by the Bank of Japan to investigate the feasibility of using it as well as the technical issues of using it.
With cryptocurrency that has the potential to rise above inflation, different countries may seriously explore the possibility especially with the falling value of fiat currency due to inflation and over-printing of currency.
The use of blockchain technology is one of the considerations for Digital Yen.
For faster transaction without consensus can be faster but the possible cyberattack while consensus can be achieved with slower transaction.
The bank would need to consider the pros and cons of both before they can make a decision.
With China creating their own Digital Yuan, this move is probably a way not to be left behind but stay competitive.
Cyber-security may often be the main concern when there is a decentralised system.
As a bank, it is important to ensure all corners are covered before rolling out to the public.
Reference Article:
https://blockchain.news/news/bank-of-japan-testing-digital-yen-cbdc
Disclaimer: This is my personal reflection and I am not in any position to instruct anyone what they should do. I am not responsible for any action taken as a result of this post. My post can only be a reference for your further research and growth.