BoE charts new wholesale terrain for stablecoins and tokenised assets

The Bank of England is evaluating the role of stablecoins in wholesale payments and tokenised asset infrastructure via its UK Digital Securities Sandbox, at a pivotal juncture for financial market innovation. Sasha Mills, Executive Director of Financial Market Infrastructure, outlined this approach during her keynote at City Week in London on 2 July. The central bank is focusing on blending stability, regulatory clarity, and interoperability as it reshapes post-trade and settlement systems.

Mills emphasised that the digitalisation of wholesale financial markets—driven by tokenisation, distributed ledger technology, smart contracts and programmable ledgers—has the potential to enhance market depth, reduce friction, and mobilise capital more efficiently. Yet she stressed that any emerging system must preserve the bedrock of financial stability: confidence in finality of settlement and risk parity across new and legacy platforms.

The Digital Securities Sandbox has emerged as a cornerstone of the Bank’s strategy. Since its inception, the sandbox has attracted both incumbents and new market entrants. A notable early application has been the UK Government’s Digital Gilt pilot—nicknamed DIGIT—where debt issuance occurs on a distributed ledger. Mills noted it has catalysed broader interest in using tokenisation to simplify asset mobility, enable intraday repo operations and improve collateral utilisation.

Crucially, the Bank is exploring the integration of stablecoins within this sandbox framework. While central bank money remains the preferred settlement asset, Mills described the Bank’s position as “open‑minded” to stablecoins’ potential utility in wholesale markets. The Bank plans to provide further clarity on stablecoin roles and standards later this year.

In its consultation approach to systemic stablecoins—launched with a discussion document in November 2023—the central bank is considering reforms such as permitting a percentage of reserves to be held in high-quality liquid assets, rather than unremunerated central bank balances. It is also contemplating transitional holding limits: for individuals, between £10,000 and £20,000; for businesses, up to £10 million. These measures aim to curb stability risks from sudden large outflows.

Beyond stablecoins, tokenised deposits are highlighted as a promising vehicle to merge regulatory safeguards of traditional deposits with the efficiency of real-time, on‑chain settlement. Mills confirmed the Bank is working to integrate tokenised deposits across DSS initiatives and its broader National Payments Vision.

Complementing these developments, the Bank continues to elevate its core infrastructure. Its Real‑Time Gross Settlement system is undergoing major upgrades under the RT2 programme. Upcoming enhancements include broader access, extended operating hours, and a synchronisation interface. This interface is designed to facilitate conditional settlement—in which transfers within the RTGS can be synchronised with transactions on external DLT systems.

The Bank has joined the BIS Innovation Hub’s DLT Innovation Challenge to test whether wholesale central bank money can be transacted and settled on external programmable ledgers. Mills described this as an experiment into how wholesale central bank monies, stablecoins, and tokenised deposits can co-exist safely.

The BoE maintains that a mixed infrastructure ecosystem—where traditional and emerging systems operate side by side—is the foreseeable outcome. Ensuring interoperability across public and private, permissioned and permissionless ledgers is essential to prevent liquidity fragmentation and support seamless transfer of capital. Public blockchains may offer connectivity solutions, provided they meet security and regulatory standards.

Mills cautioned that while technological adoption is important, regulators must integrate hard-earned lessons on confidence and stability. “Money requires confidence to support economic activity and growth in good times and bad,” she said, warning that failures in settlement finality could erode trust and trigger cascading market events.

With its “secondary innovation objective”, the Bank is actively reviewing existing regulations that pose barriers to digital finance, engaging continuously with industry participants. The DSS, tokenised deposits, upgraded RTGS, stablecoin framework, and experimental alignment with DLT signal a coordinated strategy to modernise UK wholesale finance.