From a Sveriges Riksbank press release.
The project e-krona based on blockchain that has been developed and tested by the Riksbank provides new possibilities, but is also new and needs further investigation. This is one of the lessons learned as described in the e-krona pilot project’s report on its first phase. The e-krona based on blockchain pilot has the objective of testing a proposal for a technical solution to increase the Riksbank’s knowledge of how an e-krona could function and be used as a complement to cash.
The technology provides new possibilities but requires further investigation.
Different forms of storage of tokens and keys provide different properties.
A parallel network makes the payment system more robust.