I wrote about it on my blog. It's not the same. What countries want is currency that can be programmed. Right now, all the programming bits is handled by banks

I wrote about it on my blog. It's not the same. What countries want is currency that can be programmed. Right now, all the programming bits is handled by banks and merchants. For example, if a bank wants you to purchase something from amazon - they will give you a cashback on transaction. Similarly, amazon gives vouchers for you to spend only on their site. If countries could directly program money so no matter where you move it, you cannot spend it on things they don't like or expire it - it gives central banks way more leverage. There will be no need for welfare vouchers when you can give money that is only spendable on grocery and not reedemable to cash or transfer. Countries could add complex TDS (taxation at source) rules to their programmable currency any time to influence the economy and spending. They could control supply which isn't easy today with all the parties involved. The tools central banks have today are too blunt.