The UK Digital Securities Sandbox (DSS) has been in operation for one year: 11 Gate 1s have been approved, and the rule upgrade has ignited a new track for on-chain clearing in London

1️⃣ Background and timeline

2️⃣ Participant portrait: from start-ups to giants

Gate 1 Pass List (Excerpt)

• ClearToken CSD : DLT clearing house, positioned as “Euroclear on chain”.

• Montis Digital : Incubated by Cambridge University, focusing on the chainization of private equity.

• Euroclear UK & Intl.: Traditional FMI enters the market and tests multi-chain cross-border DVP.

• HSBC Bank plc : Issues digital bonds on its own Orion platform.
  bankofengland.co.uk

By business type:

• DLT Clearing Houses/CSDs : 4

• Multilateral Trading Facility (MTF) or DEX-type platforms : 3

• Banks/Securities firms issuing on-chain products : 2

• Asset tokenization service providers : 2

3️⃣ Rulebook upgrade: three major changes

1. Capital tier : CSD ≥ £5 million, DLT-MTF ≥ £2 million, doubled in 2024 draft.

2. Real-time supervision interface : In the Go-live phase, the BoE must be provided with T+0 settlement data API; abnormal net amount exceeding the threshold should be reported within 15 minutes. omfif.org

3. Exit mechanism : The maximum test period is 5 years. If the system fails to convert to regular form, the system must be smoothly moved out with zero loss of customer assets.

4️⃣ Market significance: London on-chain clearing “three steps”

• T+Instant : DSS allows participants to record accounts on the private chain and then settle synchronously through the BoE RTGS node.

• Combined license : The FCA Instrument integrates trading and custody, creating the world’s first “full-stack license” model.

• Cross-border mutual recognition : UK-US working group confirms to explore the feasibility of DSS-DTCC interface, and strives to conduct bilateral pilot in 2026. gov.uk

5️⃣ Risks and Challenges

1. Technical threshold : Must use England or EU data center, overseas public chains need to be mirrored as sovereign nodes.

2. Funding efficiency : 24/7 atomic settlement reduces credit risk, but may increase margin utilization.

3. Jurisdiction coordination : The UK and EU clearing ecosystems are divided. If the EU does not recognize the “on-chain ISIN” produced by DSS, cross-border liquidity may be restricted.

6️⃣ International comparison: DSS vs. other countries’ sandbox

7️⃣ Outlook and Suggestions

• 2025 Q4 : The first three companies are expected to obtain Gate 2 licenses and conduct “real money” online testing.

• Securities firms/custodian banks : should connect to the DSS API in advance and evaluate the on-chain net balance optimization model.

• Asset managers : Pay attention to the efficiency of on-chain ETF subscription and redemption, and re-evaluate transaction costs and liquidity discounts.

• Technology suppliers : The demand for secure multi-party computing (MPC) and hardware isolation modules (HSM) has increased significantly, which is the entry point.

🔚 Conclusion

The digital securities sandbox allows London to regain the commanding heights in the global blockchain financial infrastructure competition. The 11 Gate 1 passers are just the prologue, and the real highlight will be the implementation of cross-border atomic DVP and real-time risk control in 2026. For institutions that want to participate in the next generation of capital markets, they should now devote themselves to the "on-chain clearing" blueprint, otherwise they will be marginalized by the new rules.

Written by Marcus Watts (Australian financial journalist based in London)