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Project Mariana was developed jointly by three BIS Innovation Hub centres (the Swiss, Singapore and Eurosystem Hub Centres) together with Bank of France, Monetary Authority of Singapore, and Swiss National Bank.

The project's proof of concept successfully tested the cross-border trading and settlement of hypothetical euro, Singapore dollar and Swiss franc wCBDCs between simulated financial institutions. The process relied on three elements:

1. A common technical token standard provided by a public blockchain to facilitate exchange and interoperability between the different currencies.

2. Bridges for the seamless transfer of wCBDCs between different networks.

3. An Automated Market Maker (AMM), which is a specific type of decentralised exchange to trade and settle spot FX transactions automatically.

For Project Mariana, the AMM pooled the liquidity of the hypothetical euro, Singapore dollar and Swiss franc, wCBDCs with innovative algorithms enabling spot FX transactions to be priced and executed automatically and settled immediately. These protocols could be used by the next generation of financial market infrastructures facilitating cross-border trading and settlement between financial institutions.

Project Mariana's architecture balances central banks' domestic need for oversight and autonomy with financial institutions' interest in efficiently holding, transferring, and settling wCBDC across borders. This is achieved through the use of a common token standard on a public blockchain which facilitates interoperability and seamless exchange of wCBDC across varied local payment and settlement systems maintained by participant central banks. As such, Mariana offers possible approaches to factoring an international dimension into current wCBDC design explorations.

As tokenisation and DeFi technologies are still nascent, further research and experimentation is needed. The BIS Innovation Hub and its global partners will continue exploring their benefits and challenges based on relevant use cases.

Project Mariana is purely experimental and does not indicate that any of the partner central banks intend to issue wCBDC or endorse DeFi or a particular technological solution. It is the Innovation Hub's first cross-centre project.