Some Central Banks in the world are changing their attitude towards digital currencies. On November 28, Incoming Federal Reserve Chairman Jerome Powell stated that he believes at present Bitcoin will still not threaten the economic stability, but in the future digital currencies will be very important. The Bank of International Settlements believes that Central Banks should define the technical standards and legal attributes required for digital currencies as soon as possible. From the above statements, Central Banks are becoming more active toward launching digital currencies. It is possible that the Central Banks' research and launch of digital currencies may be accelerated in the future.