Background
Since consulting in 2022 on the Roadmap for the Real-Time Gross Settlement service beyond 2024 and delivering the UK’s renewed RTGS service (RT2) in 2025, the Bank of England (‘the Bank’, ‘we’) has prioritised the development of a new ‘synchronisation’ capability as a future enhancement to RT2. Synchronisation would allow for atomic settlement in central bank money: the conditional settlement of funds in RT2 against assets on a variety of external asset ledgers, such that funds in RT2 will settle if and only if the external asset also settles. Synchronisation involves a new type of entity – a 'synchronisation operator' – to orchestrate movements of funds in RT2 with the transfer of assets on external ledgers.
We have worked with industry through co-creation as well as undertaking experimentation with the BIS Innovation Hub London Centre and partner central banks to identify use cases for synchronisation, and to explore design options for the new synchronisation capability.
To build confidence that synchronisation services will meet users’ needs, we are now launching a Synchronisation Lab to extend our collaboration with prospective synchronisation operators and users before taking consequential decisions on the design and delivery of a future live RT2 synchronisation capability.
Purpose and scope
We are launching the Synchronisation Lab (‘the Lab’), as a platform to simulate the synchronisation interface that we are designing and enable prospective synchronisation operators (‘Lab Participants’) to demonstrate viable propositions across multiple use cases.
The Lab’s key aims are:
- Validating the Bank’s design choices for an RT2 synchronisation capability. By enabling Lab Participants to engage with infrastructure that the Bank will provide and to test different arrangements, we will be able to better evaluate design options for the exchange of information between RT2 and synchronisation operators.
- Demonstrating synchronisation’s flexibility. We invite Lab Participants to showcase the multiple use cases services and benefits they could offer to synchronisation users by leveraging the RT2 synchronisation capability currently being developed by the Bank.
- Supporting ecosystem readiness. We want to enable Lab Participants to demonstrate: (a) services they might offer; and (b) how they propose to interact with synchronisation users, to help understand evaluate different options for the end-to-end of a synchronised transaction. ‘Synchronisation users’ include end-customers in relevant asset markets: asset ledgers; and RT2 account holders, ie banks and other payment service providers that hold an account in RT2.
While the Lab will play an important role in shaping the Bank’s assessment of the best path for progressing towards delivering a future live RT2 synchronisation capability, it is important to note that we are not required to act on the Lab’s output. Lab Participants will not carry decision-making or formal advisory responsibilities, and we are not obliged to formally consult the Lab Participants before making decisions. Our engagement with Lab Participants will not replace the generally applicable mechanisms for consultation and engagement that the Bank operates in fulfilment of its statutory objectives.
Timelines and processes
We expect the Lab to launch in spring 2026 and to be operational for around six months. Two cohorts of Lab Participants will join approximately two weeks apart and are expected to remain involved throughout the full Lab duration.
During the Lab, Lab Participants will develop and demonstrate their use cases within six months of joining. The Lab will run across three eight-week testing and development phases each focusing on different versions of flows and functionalities. Testing will take place in a small number of weeks within each eight-week phase. In each phase, Lab Participants will showcase end-to-end synchronisation flows, involving interaction with the Lab interface and integration with systems and processes of synchronisation users, who represent key parties to the synchronised transactions. This approach is designed to enable solutions to be progressively tested, refined, and enhanced as Lab Participants move from early concept exploration to progressively shaping and testing their synchronisation use cases. Lab findings will inform the design and delivery of a potential future live RT2 synchronisation capability.
Expected timeline:
- Active from in spring 2026 (for six months)
- Technical onboarding to be available approximately one month prior to launch
Demonstrations and publication of a final report with key learnings will follow the completion of the Lab.
Lab Participants
We are keen to demonstrate and work with a wide range of use cases and models. Selection for the Lab will be on the basis of:
- strength of use case design; and
- characteristics of the applicant organisation.
Full selection criteria are set out in Annex 1: Selection criteria.
Participation in the Lab is by invitation from the Bank and based on an application process, as described in Annex 2: Expression of interest. Lab Participants could be private or public sector companies and organisations that have shown both the capability and willingness to act as synchronisation operators in the Lab.
By participating in the Lab, each Lab Participant agrees to these Terms of Participation and are expected to commit fully over the six-month period (following onboarding).
Responsibilities and activities
Lab Participants are expected to test their use cases for synchronisation; demonstrate how they would interact with the Bank and other synchronisation users; and act collaboratively. This is to ensure the Lab effectively supports a wide range of use cases; to help industry understand possible end-to-end settlement arrangements for synchronised transactions; and to help the Bank refine its requirements for a future RT2 synchronisation capability.
Lab Participants are expected to:
- develop their use cases into solutions in the form of prototypes, in their own development environment, with their own synthetic data and their choice of programming languages and tools.
- demonstrate how their prototypes interact with synchronisation users and their systems and processes, to show how the end-to-end settlement of a synchronised transaction might work.
- attend workshops (technical, analytical and business) and knowledge sharing sessions with the Bank, as required.
- provide feedback in a timely manner to feedback forms distributed by the Bank.
- meet additionally with the Bank to discuss their use cases and business models, when required.
- support interim demonstrations of the Lab’s RT2 synchronisation capability for the Bank and potentially other Lab Participants; for the Bank’s stakeholder groups (to be identified by the Bank); and where appropriate, more widely, either by performing live demonstration(s) or providing video(s).
- contribute insights and reflections from their design and development process, to help draw conclusions and shape the Lab reports which may be shared with other Lab Participants, Bank’s stakeholder groups (to be identified by the Bank), and where appropriate, more widely.
Lab Participants will nominate one person to represent them in the Synchronisation Lab User Group, a forum comprising all Lab Participants. The Synchronisation Lab User Group will meet frequently (to be determined by the Bank) for the duration of the Lab to discuss progress, outcomes, and share insights. Some meetings may involve technical demonstration of the use cases developed by the Lab Participants or any additional capability implemented on the Lab infrastructure. The Terms of Reference for the Synchronisation Lab User Group are set out in Annex 5: Synchronisation Lab User Group – Terms of Reference.
At selected points during the Lab, and again at its conclusion, Lab Participants will be invited to showcase their solutions to the Bank. They may also showcase their solutions to other Lab Participants, Bank’s stakeholder groups (to be identified by the Bank), and where appropriate, more widely. These showcasing opportunities will give Lab Participants and their project teams the chance to present progress, share learnings, and demonstrate outcomes from their work in the Lab.
The findings from the Lab will also be summarised in reports published on the Bank’s website. Lab Participants may be named in these reports unless they specifically request anonymity in their application. In those cases, their contribution will be published anonymously.
Terms and Conditions
The Terms of Participation include Terms and Conditions, which shall apply to the Lab Participants in their participation in the Lab generally and as members of Synchronisation Lab User Group, refer to Annex 4: Terms and Conditions and Annex 5: Synchronisation Lab User Group – Terms of Reference.
In consideration of the mutual obligations of the parties set out in this Terms of Participation, the parties (those participating in the Lab and members of the Synchronisation Lab User Group) agree to be bound by Annex 4: Terms and Conditions and Annex 5: Synchronisation Lab User Group – Terms of Reference.
Annexes
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The Synchronisation Lab User Group (‘the User Group’) is a forum comprising of all Lab Participants for the purpose of discussing progress and outcomes, and sharing insights on the use cases they have been testing in the Lab; for practical reasons, there will be two User Groups, one for each cohort participating in the Lab. The User Group will also be used to provide information about how the Lab will be organised and delivered, including sharing information about how the Lab will be run and actions required of Lab Participants.
Membership
All Lab Participants will appoint an individual from their team to represent them on the User Group. Membership is on an organisational basis and individuals appointed are expected to be members of the Lab Participants’ project teams directly involved in the Lab. At times, we may ask for or allow additional attendees from your organisation to attend where needed for specific discussions.
The User Group will meet frequently (to be determined by the Bank) for the duration of the Lab.
The Bank will chair and co-ordinate all meetings.
Responsibilities
The Bank will engage members of the User Group on issues of relevance to operation of the Lab and the use cases that the Lab Participants have been testing in the Lab. This will include updates on the progress and phases of the Lab, next steps and any actions that Lab Participants will need to undertake.
Members of the Users Group are expected to:
- attend virtual User Group meetings as required.
- provide technical, analytical and business perspectives and inputs to the discussions.
- contribute to Lab learnings by sharing information on their use case (including live demonstrations) and learnings, providing feedback on Lab functionalities, and sharing lessons from their overall experience in the Lab. Note that this will only be one forum for provision of this information – though will likely be the most timely and efficient route for sharing views.
The User Group is not a decision-making body for the Lab. The activities and discussions of the User Group should not be taken as an indication of future policy by the Bank.
The Terms and Conditions set out in the Terms of Participation shall apply to the User Group. Additional terms in relation to conflicts of interest, competition law and information-sharing are set out in this annex.
The Bank may invite select stakeholder groups (to be identified by the Bank) to attend specific User Group meetings as observers. The observers must comply with these Terms of Participation where relevant.
Conflicts of interest, competition law and information-sharing
Members are responsible for identifying and declaring any financial or other interests that could create or be seen to create a conflict of interest as a member of the User Group, as soon as they arise. This includes reviewing the forward agenda and identifying and declaring any conflicts of interest to the Bank before every meeting. If a member finds that a conflict of interest becomes apparent only as the meeting progresses, the nature of the conflict should be declared as soon as practicable to the Bank. The Bank, as Chair of the User Group, will then decide how the conflict should be managed, including whether the member should: (i) leave the meeting during discussions relating to the conflicted matter; (ii) stay in the meeting but not participate in the discussion; or (iii) stay in the meeting and participate freely
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