Banks connect tokenized assets to blockchains in several ways rather than through one universal bridge. They can use ledgers with native interoperability, cross-chain messaging or bridges, oracle and middleware integrations, or synchronization with existing payment infrastructure such as real-time gross settlement (RTGS) systems. The choice determines how atomic the transaction is, which parties must be trusted, when settlement is final, and how failures are handled.
What it means to connect a bank’s asset to a blockchain
Tokenization turns an asset or financial claim into a digital token recorded on a distributed-ledger technology (DLT) platform. The token might represent a security, a commercial-bank deposit, a physical asset or a claim against an issuer. Three separate questions are often compressed into the phrase “moving a token”:
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- Ledger representation: Which blockchain or DLT records ownership and transfers?
- Legal claim: What rights does the token holder have against the issuer, custodian or reference asset?
- Settlement asset: What money or payment instrument is exchanged when the token changes hands?
A technical transfer answers only the first question. It does not automatically prove that the underlying asset moved, that the legal claim stayed unchanged, that redemption is available, or that payment became irrevocable. The Financial Stability Board (FSB) has warned that a token linked to a reference asset can diverge in price from that asset and that issuer, custody and valuation arrangements affect the risk.
Official work to date describes multiple designs and experiments, not a single standard used by every bank. The Bank of England and BIS Innovation Hub’s 2025 DLT Innovation Challenge was exploratory and did not endorse a particular implementation or make a policy commitment.
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The four main connection patterns
1. Native interoperability inside a shared framework
In a native design, communication and asset transfer are built into a shared protocol, ledger family or governance framework. Authenticated messages can instruct one system to perform a transaction while another system performs its corresponding leg. If the framework supports atomic execution, the linked operations are coordinated by the protocol rather than by an external operator.
This approach can provide strong coordination among participating systems and a clear rulebook for validation, identity and upgrades. Its limitation is reach: connecting an unrelated public or private network may require a new adapter, separate governance arrangements or a different security model. Native interoperability therefore tends to work best when institutions agree in advance on technology, membership and operating rules.
2. Cross-chain protocols and bridges
Cross-chain protocols carry messages, proofs or representations of assets between otherwise independent ledgers. A bridge is a more specific connection between networks. Depending on its design, a bridge may lock an asset on the source chain and issue a representation on the destination chain, or it may coordinate a swap using smart contracts or hashed time-locked contracts.
Bridges are useful when a bank must connect a defined pair of networks without redesigning either ledger. Each connection can, however, require dedicated software, validators, relayers, keys and operational procedures. A defect in a smart contract, a compromised signing key, a manipulated message or a governance dispute can affect the bridge even when both underlying ledgers remain sound.
“Bridged” does not mean that the underlying legal asset moved. It may mean that a tokenized representation was created elsewhere while the original remains locked, held by a custodian or recorded on another system. The issuer’s documentation must specify redemption, custody and the conditions under which the representation is valid.
3. Oracles and middleware
An oracle supplies or cryptographically attests to information from outside a DLT. A smart contract could use an oracle to learn an exchange rate, a reference-asset valuation, an interest calculation, a sanctions result or the status of an external payment. The ledger can verify the oracle’s signature or data format, but it cannot by itself prove that the off-chain information is accurate.
Oracle risk therefore includes data-source error, delayed updates, manipulation, outages, compromised credentials and disputes over who may change the data feed. Governance must define which sources are acceptable, how many independent attestations are required, what happens when sources disagree and how an emergency pause is authorized.
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Middleware is broader than an oracle. It is an integration layer—often using APIs, message queues and shared standards—that connects DLT platforms to bank systems, custody records, compliance tools or payment networks. Middleware can transform data, route instructions and reconcile records. An oracle feeds external facts into a DLT application; middleware coordinates communication and workflows across systems. A production design may use both.
4. RTGS links and synchronization
A tokenized-securities platform can be connected to a central bank’s real-time gross settlement (RTGS) system. In this arrangement, a synchronization operator coordinates the DLT transaction with an account-based payment instruction. The objective can be delivery-versus-payment (DvP): the security leg and the money leg complete together, while the money settles in central bank accounts.
Synchronization introduces a coordinating service that must monitor both systems, handle timeouts, reconcile mismatches and recover from outages. It can connect new DLT infrastructure to established central-bank money without requiring the RTGS ledger itself to become a blockchain. The Bank of England’s wholesale experiments include synchronization work for RTGS and tokenized-securities platforms. The Bank has stated a target of a live synchronization capability in 2028; that is a future target, not a live service.
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How settlement works when a token changes hands
A tokenized asset transfer normally has at least two legs: delivery of the asset and payment. The payment leg may use tokenized commercial-bank deposits, tokenized central-bank money or another instrument such as a stablecoin. Those instruments are not interchangeable: they have different issuers, redemption rights, liquidity characteristics and credit or operational risks.
- Trade agreement: The parties agree on the asset, quantity, price, currency, delivery conditions and eligibility rules.
- Instruction and validation: Smart contracts or middleware check identities, permissions, balances, sanctions controls and any transfer restrictions.
- Funding: The buyer provides the agreed settlement asset, or the system reserves it so it cannot be spent elsewhere.
- Coordinated execution: The asset token and payment token are transferred, or the transaction is rejected or rolled back according to the connection design.
- Reconciliation: The DLT records, bank accounts, custody systems and regulatory records are compared and exceptions are investigated.
- Finality assessment: Participants determine when the technical record is irreversible and when the transfer is legally binding under the applicable rules.
In an atomic arrangement, all required legs succeed together or none does. That reduces principal risk—the possibility that one party delivers while the other does not—but the strength of the guarantee depends on where coordination is enforced. A native protocol may enforce it inside one shared environment. A bridge, oracle, middleware layer or synchronizer may instead have to detect failure and apply recovery rules across separate systems.
Settlement-asset choices
| Settlement asset | What it provides | Questions banks must answer |
|---|---|---|
| Tokenized commercial-bank deposits | A tokenized claim on a commercial bank, usable on a DLT platform. | How are deposits issued and redeemed? What happens if the issuing bank is unavailable? How are liquidity and intraday limits managed? |
| Tokenized central-bank money or reserves | A representation of central-bank money intended for wholesale settlement. | Which central bank operates the money leg? How are access, operating hours, legal finality and interoperability defined? |
| Stablecoin or another private instrument | A privately issued payment token that may operate across a blockchain network. | What backs the token, how is redemption handled, and what issuer, reserve, market and operational risks apply? |
Project Agorá is a current official prototype example. Its report, published on 27 May 2026, describes a shared platform combining tokenized commercial-bank deposits with tokenized central-bank reserves for atomic, multi-currency wholesale cross-border payments. Seven central banks and more than 40 regulated financial institutions participated. The prototype demonstrates an architecture under experimentation; it is not evidence that the design has become general commercial production infrastructure.
Atomic settlement is not the same as final settlement
Atomicity concerns coordination: do the linked legs complete together? Finality concerns the point at which a transaction is irrevocable and legally binding. A blockchain may show a technical confirmation while a participant can still reverse, challenge or unwind the transaction under the platform’s rules or applicable law.
Finality can depend on consensus, settlement-account rules, insolvency law, contractual terms and the status of an intermediary. Systemically important payment systems and financial-market infrastructures generally require a clear finality point. Faster confirmation can involve trade-offs with deterministic finality, distribution, scalability and recovery procedures. Banks must document both the technical threshold—such as a required confirmation or validator decision—and the legal event that makes the transfer binding.
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Comparing designs: the questions a bank should ask
| Dimension | Evaluation question | Typical trade-off |
|---|---|---|
| Atomicity | Where is the all-or-nothing guarantee enforced, and what happens if one system is unavailable? | A shared protocol can coordinate tightly; separate systems need synchronizers, contracts or recovery logic. |
| Security | Which smart contracts, keys, validators, oracle feeds and message channels can be attacked? | Each connector adds a possible failure point and a new control perimeter. |
| Flexibility | Can the design connect the required ledgers, assets, currencies and data types? | General-purpose messaging can reach more systems but may require more complex integration. |
| Finality | When is the record technically confirmed, and when is it legally irrevocable? | Fast technical confirmation does not automatically deliver legal finality. |
| Governance | Who can validate, pause, upgrade, restrict or reverse activity? | More participants may improve checks but make emergency decisions slower. |
| Resilience | How are congestion, outages, duplicate messages, failed transactions and recovery handled? | Redundancy and reconciliation improve resilience but add operational complexity. |
| Privacy and compliance | Which participants see balances, counterparties and transaction details, and how are controls applied? | Confidentiality techniques can limit transparency for validators and supervisors. |
Where the major risks sit
Connector and operational risk
Interoperability can reduce fragmentation while creating new dependencies. A bank may become reliant on a bridge developer, a messaging network, an oracle operator, a synchronizer or a custodian. Outages, software updates, key loss and inconsistent records can prevent settlement even when the source and destination ledgers are functioning.
Token and reference-asset risk
The token’s market price may diverge from the reference asset. Liquidity and maturity mismatches, leverage, asset-quality concerns and interconnected exposures can become more significant as tokenized markets grow. Redemption terms, custody arrangements and valuation methods should be tested under stressed conditions rather than inferred from the token’s technical design.
Governance and legal risk
Every design needs rules for onboarding, validator selection, upgrades, sanctions screening, emergency pauses, disputed transfers and recovery after a fork or outage. A bridge may be technically secure but governed by a party that lacks authority over the underlying legal claim. Conversely, a legally enforceable claim may be difficult to transfer if the ledger’s permissioning rules do not recognize the new holder.
The FSB’s 2024 assessment judged adoption to be very low on the limited public data available at that time and concluded that tokenization did not then pose a material financial-stability risk because of its small scale. It also warned that greater scale, complexity or insufficient oversight could change that assessment. That conclusion is dated to 2024 and should not be treated as a permanent measurement.
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A practical architecture decision process
Before selecting a connector, a bank can work through the following sequence:
- Define the legal object: Specify whether the token represents a security, deposit, physical asset or issuer claim, and identify the holder’s redemption and enforcement rights.
- Map both ledgers: Document the source and destination consensus, permissioning, operating hours, identity model, confirmation rules and upgrade authority.
- Choose the money leg: Decide whether payment uses commercial-bank deposits, central-bank money or another instrument, and assess issuer and liquidity risk.
- Set the atomicity requirement: Decide whether a failed leg must prevent every other leg, and identify which component enforces that rule.
- Inventory dependencies: List bridges, oracle feeds, middleware, custodians, validators, key-management services and RTGS operators.
- Define finality: State the technical confirmation threshold, legal finality event and treatment of reversals, disputes and insolvency.
- Test failure paths: Simulate stale oracle data, a lost key, a delayed message, a chain halt, duplicate instructions, congestion and a synchronizer outage.
- Assign governance: Name who may pause, upgrade, recover or restrict the system, how decisions are authenticated and how participants are notified.
- Reconcile continuously: Compare token balances, bank accounts, custody records and regulatory reports, with an exception queue and defined resolution times.
Can banks move tokenized assets between blockchains?
They can move a tokenized representation between connected networks when the relevant bridge, messaging protocol or integration permits it. Whether the transfer is economically and legally equivalent to moving the underlying asset depends on the issuance, custody, redemption and governance documents. A representation may be locked on one network while a new token is issued on another; that is different from transferring the underlying security or deposit itself.
For that reason, a bank should describe a transaction precisely: “message relayed,” “representation minted,” “asset released by the custodian” and “payment final in central-bank money” are different events. Treating them as one event can conceal settlement, legal and operational gaps.
What the current evidence supports
Central-bank and BIS work supports the conclusion that tokenized-asset infrastructure is moving toward combinations of shared ledgers, connectors and conventional payment systems. Project Agorá shows a prototype for multi-currency wholesale settlement, while the Bank of England’s synchronization programme identifies a possible path between RTGS and tokenized securities platforms, with a stated 2028 live-capability target.
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