UK Digital Securities Sandbox: Opportunities for Asset Tokenisation Platforms

A Genuine Regulatory Innovation

The Digital Securities Sandbox represents a meaningful departure from the UK's traditional approach to financial regulation. Rather than requiring firms to operate under the full weight of existing rules designed for conventional securities infrastructure — rules that were written for a world of paper certificates, T+2 settlement, and centralised intermediaries — the DSS creates a time-limited regulatory space in which tokenised securities can be issued, traded, and settled under a modified framework.

The legal underpinning is the Financial Services and Markets Act 2023, which granted HM Treasury and the financial regulators the power to create a Financial Market Infrastructure sandbox. The DSS is the first sandbox created under those powers. The FCA and the Bank of England act as co-regulators, with the FCA covering conduct aspects and the Bank of England supervising systemically important participants.

For UK fintechs building in the tokenised securities space — whether that is a tokenised bond issuance platform, a digital settlement system, a tokenised fund infrastructure, or a digital custody service — the DSS is now the primary regulatory framework to engage with. Understanding it in detail is not optional; it is a prerequisite for any commercial strategy in this space.

What the DSS Is and How It Works

The DSS creates a dual regulatory structure. A firm admitted to the DSS operates under modified rules during the sandbox period, with a defined pathway to full authorisation when the permanent legal framework for digital securities is enacted. The sandbox period is not indefinite: the DSS is designed as a transitional framework, not a permanent alternative to full authorisation.

Firms admitted to the DSS receive "sandbox permissions" that allow them to operate activities which would otherwise require full authorisation under existing legislation, but under modified conduct, capital, and reporting requirements. The modifications are tailored to the specific activities and risk profile of each firm and are set out in an individual firm's sandbox conditions. Firms are also subject to enhanced regulatory reporting and supervisory engagement during the sandbox period, reflecting the experimental nature of the activities.

The key structural element is the activity-based approach. The DSS does not authorise firms to operate a business; it authorises specific activities. A firm wishing to operate a Digital Securities Depository (a combined CSD/CSP function in digital form), a trading venue for digital securities, or a digital settlement system must apply for each activity specifically and demonstrate that its systems, controls, and governance are appropriate for that activity at the scale proposed.

Which Asset Types the DSS Covers

The DSS covers digital securities: tokenised versions of financial instruments that are already within the regulatory perimeter under existing legislation. Specifically, the sandbox covers tokenised equities, tokenised bonds (both sovereign and corporate), tokenised money market instruments, and tokenised fund units.

What the DSS does not cover is equally important. Payment tokens and stablecoins are not digital securities and fall outside the DSS scope. They are regulated separately under the FCA's cryptoasset framework (the forthcoming authorisation regime under FSMA 2023 and the MLR 2017). Utility tokens, governance tokens, and other cryptoassets that do not represent ownership of a traditional financial instrument are also outside DSS scope.

Who Should Consider Applying

The DSS is designed for a specific category of infrastructure firm: those building the plumbing of digital capital markets rather than consumer-facing investment products. The most relevant profiles are:

• Tokenised bond issuance platforms: infrastructure that allows corporate or government bond issuers to issue bonds as digital securities on a blockchain or distributed ledger, with smart contract automation of coupon payments and maturity redemptions.
• Digital settlement systems: platforms that provide settlement finality for digital securities transactions, potentially replacing or supplementing the role of traditional central securities depositories.
• Tokenised fund platforms: platforms that issue fund units as digital securities, enabling real-time subscription and redemption, automated distribution of income, and programmable shareholder rights.
• Digital custodians: firms providing custody of digital securities on behalf of institutional or professional clients, with the regulatory obligation to segregate client assets.

Consumer-facing investment platforms that wish to offer tokenised securities to retail investors are likely to face a more complex regulatory path, as retail investor protection requirements add additional layers of obligation. The DSS is most naturally suited to institutional and professional market infrastructure in its current form.

Modified Requirements Within the Sandbox

The specific modifications available within the DSS are tailored to each firm's activities and agreed with the FCA and Bank of England as part of the application process. However, the general approach is to provide modified versions of requirements that would otherwise create barriers to entry for digital securities infrastructure — not to eliminate regulatory requirements altogether.

Capital requirements within the DSS are typically calibrated to the firm's actual scale of activity rather than the minimum capital levels set for full-scale market infrastructure operators. A firm processing £50 million of digital securities issuance per year is not expected to hold the same level of capital as a firm clearing £500 billion. This graduated approach to capital is one of the most practically significant modifications for early-stage DSS participants.

Reporting requirements within the DSS include enhanced regulatory reporting relative to full authorisation in some respects (to provide the FCA and Bank of England with visibility of the sandbox in operation) and simplified reporting in others (where full compliance with existing reporting templates would be incompatible with digital securities infrastructure). Firms in the DSS are also typically required to participate in regular supervisory dialogue.

Experimental permissions allow firms to test specific functionality — for example, T+0 settlement finality, programmable corporate actions, or fractional ownership — that would not be possible under existing market infrastructure rules. The experimental permission framework is what makes the DSS genuinely innovative: it allows firms to test technology that the existing rules were not designed to accommodate.

The Business Case for Tokenised Securities in 2024

The commercial rationale for tokenised securities infrastructure rests on a small number of genuinely compelling efficiency arguments that have gained material traction with institutional market participants in 2023 and 2024.

The first and strongest argument is settlement efficiency. Conventional securities settle at T+2 (two business days after the trade date), which creates two days of counterparty exposure for every trade. Digital securities operating on distributed ledger technology can achieve settlement finality on the day of the trade, or even within minutes. For high-volume institutional trading, the reduction in counterparty risk and the associated reduction in margin requirements has direct financial value. The BIS and FSB have both published analyses suggesting that T+0 settlement could reduce systemic risk in financial markets by material amounts.

The second argument is operational automation. Smart contracts can automate corporate actions — coupon payments, dividend distributions, voting notifications, maturity redemptions — that currently require significant manual processing by transfer agents, custodians, and issuers. The reduction in operational cost and operational risk (from processing errors) is real and measurable.

The third argument is fractional ownership. Many high-quality debt instruments (investment-grade corporate bonds, sovereign bonds) are denominated in minimum parcels of £100,000 or more. Tokenisation allows these instruments to be subdivided into much smaller ownership units, potentially widening the investor base for issuers and improving liquidity in secondary markets.

CFO and Finance Implications

For the CFO of a firm operating within or considering the DSS, there are several specific areas that require active management.

The accounting treatment for digital securities held as assets is currently under development at both IFRS and UK GAAP level. Under existing IFRS, digital securities that represent ownership of an underlying financial instrument may qualify for treatment as financial assets under IFRS 9, with measurement at fair value through profit or loss or amortised cost depending on the business model and cash flow characteristics. This is preferable to the intangible asset treatment applied to most cryptoassets. However, the guidance is not yet definitive and requires active engagement with the external auditor to agree the appropriate treatment for each specific instrument type.

Custody arrangements for digital securities require specific contractual and legal analysis. The question of how digital securities held in custody are treated in the insolvency of the custodian is a legal question that is not yet fully resolved under English law. The DSS framework requires participating firms to maintain client asset segregation and to maintain records in a form that would allow clear identification of client assets in an insolvency. CFOs of DSS-admitted firms must ensure that custody arrangements are documented with this requirement in mind.

Investor reporting for digital securities issuances must address the novel characteristics of the instrument: how settlement is confirmed, how corporate actions are communicated and processed, and how the blockchain record is reconciled with conventional accounting records. For debt issuances, the interest calculations and maturity redemption mechanics are typically automated by smart contract, but the accounting entries must still be processed in the issuer's ERP in the conventional way.

Key Takeaways

• The UK Digital Securities Sandbox, launched under FSMA 2023, allows firms to test tokenised securities infrastructure under modified regulatory requirements, with a pathway to full authorisation when permanent rules are in place.
• The DSS covers digital securities: tokenised equities, bonds, money market instruments, and fund units. It does not cover payment tokens, stablecoins, or cryptocurrency. These are different regimes with different regulators.
• The DSS is most relevant to infrastructure builders: tokenised bond platforms, digital settlement systems, tokenised fund platforms, and digital custodians.
• Modified requirements within the DSS include graduated capital requirements, tailored reporting, and experimental permissions for functionality that existing market infrastructure rules cannot accommodate.
• The business case for tokenised securities rests on T+0 settlement efficiency, programmable corporate action automation, fractional ownership, and 24/7 market access. All four arguments have genuine institutional support in 2024.
• The accounting treatment for digital securities as assets is still evolving; IFRS 9 financial asset treatment may be available but requires audit engagement. Custody arrangements require specific legal analysis on client asset protection in insolvency.
• Firms that treat regulatory engagement as a core competency — not a compliance burden — will be best positioned to navigate the DSS and the permanent framework that follows it.