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DCM Core Policy Library | PL-2026-05

Wholesale CBDC Interoperability & Settlement Models

DCM Core Macro-Tech Unit
Publication: March 2026 | Format: 6-Page Standard

01 Executive Summary

Wholesale Central Bank Digital Currencies (wCBDC) are widely recognized as a critical tool for improving the efficiency and safety of interbank settlement. This paper evaluates the technical interoperability models between permissioned DLT platforms and legacy Real-Time Gross Settlement (RTGS) systems, comparing trigger mechanisms, bridged networks, and native multi-ledger solutions.

We assess the trade-offs of each architecture regarding processing speed, liquidity lockup, and system complexity. We conclude that trigger solutions minimize central bank ledger integration risks, whereas native wCBDC architectures offer the highest settlement efficiency but require deeper regulatory restructuring.

02 Problem Statement

The integration of on-chain digital assets (such as tokenized bonds or commercial paper) with central bank money requires atomic settlement (Delivery-versus-Payment). However, central banks are hesitant to host their main balance sheet accounts on distributed ledgers, creating a disconnect between tokenized assets and cash legs.

"Developing a wCBDC is not just a technological upgrade, but a structural re-engineering of the central bank's relationship with commercial bank ledgers."

Without interoperable settlement links, financial institutions must lock up liquidity in separate pools on different networks. This liquidity fragmentation increases financing costs, limits capital efficiency, and complicates real-time treasury management.

03 Policy Context

The BIS Innovation Hub and central banks globally have launched trials (such as Project Helvetia in Switzerland and the Eurosystem exploratory work) to test wCBDC settlement. These initiatives aim to ensure that central bank money remains the ultimate settlement asset for wholesale financial transactions, even as capital markets tokenize.

Regulators must decide whether to support trigger solutions (which link external DLTs to legacy RTGS systems via APIs) or to deploy native wCBDCs directly on shared DLT networks. This choice has major implications for monetary policy implementation and systemic risk.

04 Analysis & Operational Impact

Our comparative analysis focuses on the operational trade-offs of the three primary settlement models. The first model, the Trigger Solution, allows an on-chain asset transaction to trigger a payment instructions inside the traditional RTGS system. This model keeps central bank accounts secure on legacy systems but does not support true atomic swap capabilities.

The second model, the Bridged Network, uses interoperability protocols to lock assets on one ledger and issue equivalent tokens on another. This model enables cross-chain DvP but introduces smart contract risk and potential security vulnerabilities at the bridge interface.

The third model, native wCBDC, issues central bank money directly on a shared DLT platform where tokenized assets reside. This model achieves true, real-time atomic settlement with zero credit risk, but requires central banks to manage node security and validator consensus directly.

05 Policy Recommendations

To guide central banks and commercial participants in implementing interoperable wholesale settlement infrastructures, we recommend the following design principles:

Design Principles for wCBDC Interoperability:

  • Deploy hybrid architectures, starting with trigger solutions to secure immediate DvP capabilities, while building native wCBDC pilot infrastructures for next-generation platforms.
  • Standardize cross-chain interoperability APIs based on open protocols to prevent vendor lock-in and support multi-platform integration.
  • Implement liquidity-saving mechanisms (LSMs) in wCBDC platforms to minimize the liquidity requirements of real-time atomic settlement.

06 References & Citations