Bank of Canada Identifies Technical Path for Retail CBDC in New Research Paper
The Bank of Canada has published research exploring the technical feasibility of a retail central bank digital currency (CBDC) for Canada. This follows a previous decision to shift focus away from a retail CBDC, indicating a renewed interest based on potential future demand. The research proposes a system based on OpenCBDC 2PC, developed in collaboration with MIT’s Digital Currency Initiative. This design prioritizes privacy, speed, and decentralization.
A key focus is enhancing user privacy, addressing concerns about potential government surveillance of financial transactions. Unlike traditional CBDC models, this design separates personal identity from transaction data. Non-registered users can hold funds in self-custodied wallets and transact anonymously. Even for registered users, the central bank wouldn’t access identifying information or transaction histories. Further privacy enhancements are proposed through cryptographic techniques like zero-knowledge proofs to obscure transaction amounts from the core infrastructure. This aims to surpass the privacy offered by current electronic payment systems.
The proposed system utilizes an unspent transaction output (UTXO) structure, similar to Bitcoin, rather than traditional account-based systems. Transactions involve two steps: updating a core ledger and transferring funds between wallets. This enables real-time settlement and strengthens privacy from both banks and government entities.
However, challenges remain. Integrating this architecture with existing retail payment infrastructure would require significant technical upgrades, particularly for point-of-sale terminals. While theoretically scalable, performance during audits and system recovery needs further improvement to meet production standards.
The research emphasizes that this isn’t a commitment to launch a CBDC. Nevertheless, it provides a detailed technical blueprint for a system balancing user privacy, institutional control, and operational resilience. The timing of the report is noteworthy given Prime Minister Justin Trudeau’s previous advocacy for CBDCs. The research offers a concrete foundation for future discussions and potential development of a digital Canadian dollar.
