Hmmm... quote,

> The basic concept for e-krona is as follows: it would be digital, and have a 1-to-1 conversion with an ordinary krona held in an account at the Riksbank or stored locally, for example on a card or in a mobile phone app.

> The technology to build a functioning e-krona is already available today. It is not dependent on using distributed ledger technology and it is not to be confused with cryptocurrencies.

I'd like to know what this available technology is, that can create a digital object that guarantees a 1:1 correspondence to a physical asset, cannot be duplicated or multiple-spent. Has Sweden discovered the un-copy-able bit?