Project Tourbillon, by the Bank for International Settlements' (BIS) Innovation Hub in Switzerland explores payer anonymity with central bank digital currencies (CBDC).
A final report on the project published Wednesday shows the central banks looked at payment options where users don't need to disclose personal information to anyone, including the merchant.
As jurisdictions around the world consider issuing digital versions of sovereign currencies, privacy has emerged as a chief public concern.
The project built two scalable prototypes that could handle a growing number of transactions.
Further work is needed to explore sustainable business models, offline payments and other features, the report said.
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