Study: Zero-Knowledge Proofs Can Fix CBDC Privacy
Get the Health newsletter
Daily health & science — research, biotech, public health, the studies worth knowing. Free.
- Professors Iwa Salami (University of East London) and William Buchanan (Edinburgh Napier University) published research arguing that privacy risks in state-backed retail digital currencies can be reduced through careful system design and legal safeguards.
- The study highlights zero-knowledge proofs — cryptographic tools that verify a payment was made without revealing the sender, recipient, or purpose — as a key technical solution to CBDC surveillance concerns.
- The proposed architecture routes customer identity data through private intermediaries like banks and fintechs, while the central bank operates the underlying payment system without direct access to personal information.
- The researchers recommend additional safeguards including tiered anonymity for small payments and statutory limits on how transaction data can be used, tying privacy protection to both code and law.
- The UK context looms large: the Bank of England and HM Treasury are jointly exploring a 'digital pound' but have not committed to launch, citing legal, economic, and privacy questions that the new paper claims are solvable.
- Salami stated that privacy and financial innovation 'do not have to be in conflict,' framing public trust as the decisive variable for whether retail CBDCs achieve adoption.
- The paper, titled 'Data privacy in a retail CBDC system built on a public blockchain' (2025), concludes that the trajectory of retail CBDCs hinges on policy choices about data control, system governance, and legal protections — not just technology.
Why it matters: The Bank of England and HM Treasury are still weighing whether to launch a digital pound, with privacy cited as a core unresolved question; this study gives policymakers a concrete technical-and-legal blueprint (zero-knowledge proofs plus an intermediary layer) to point to when defending the project to a skeptical public. For central banks globally weighing retail CBDC launches, it reframes privacy from a blocker into a design parameter.
Ask SkimNews
