Blockchain in Banking and Finance: Where It Works and Where It Does Not

Banking runs on two properties a ledger deliberately removes

The first is settlement finality that holds in law, not only in code. The second is the ability to undo a mistake.

Both are absent from a blockchain by design, and both are non negotiable for a regulated institution. So every bank deployment reintroduces them, and reintroducing them means reintroducing an authority with powers to intervene, which is precisely what the architecture was meant to remove.

Not fatal. Plenty of worthwhile systems sit at that compromise. But it changes what you are building, and it is better said on day one than found at legal review.

Finality on a chain is not finality in law

Settlement finality in conventional systems is generally statutory. Designated systems benefit from protections making settled transfers legally irreversible even through an insolvency, which is what allows institutions to treat them as done.

A transfer confirmed on a chain resembles this technically and has a legal status that varies by jurisdiction and arrangement. Whether it is protected, and from what moment, is a question for counsel in each relevant jurisdiction, and the answer decides whether the bank can treat it as settled for accounting, risk and regulatory purposes.

Confirm it before design is fixed. A system that technically settles but does not legally settle creates an exposure the risk function will refuse, and engineering cannot close that gap afterwards.

Errors have to be recoverable

Operational banking assumes mistakes are fixable. Payments get recalled, misdirected funds returned, duplicate instructions reversed. Dual control exists because people make errors.

So every deployment needs a documented mechanism for handling an erroneous transfer, and every such mechanism creates an authority able to move value it does not own. Who holds it, what constrains it, its approval path and how its use is logged are first order design questions, not hardening steps.

Across several institutions this is a governance negotiation before it is a technical design. Settle it in a document, then check the deployed permissions match line by line.

Subtract what banking already fixed

Much of the original pitch has been overtaken. Instant payment schemes settle domestic transfers in seconds in most developed markets, through infrastructure operated by a party all participants accept. Settlement cycles have been compressed. Messaging standards carry richer structured data.

For domestic payments the condition that makes a shared ledger valuable, the absence of an operator everyone trusts, is simply not present. The scheme operator is trusted by regulation and by design, so a proposal to replace it should explain what it adds. Usually the honest answer is nothing.

The one real gap is programmability, payments conditioned on events. Whether that justifies the architecture depends on how much of your volume needs conditional execution, and for most banks it is a small fraction.

Cross border is where the diagnosis still holds

A cross border payment often traverses several correspondent banks, each running its own compliance checks, holding pre funded accounts in the other's currency, keeping its own record. The sender frequently cannot see where the payment is or when it will land.

The cost is not processing. It is liquidity trapped in pre funded accounts, reconciliation labour across institutions, and exception handling when a payment stalls, all of it flowing from every participant keeping a separate record of the same transaction.

That is the shape a shared ledger addresses, and it still turns on whether the participating banks will accept a common operator. If they will, a shared scheme database achieves much of the same result. If they will not, because of competitive sensitivity about who sees which flows, a permissioned design becomes genuinely relevant rather than decorative.

Collateral mobility is the quiet one that pays

The strongest wholesale case gets the least attention because it is unglamorous.

Collateral posted against margin and repo obligations often takes a day or more to move between custodians and jurisdictions, so institutions hold buffers against the delay. Moving it in minutes reduces the buffer, freeing capital that sits idle for operational rather than risk reasons.

The benefit is measurable, the participants are a manageable number of sophisticated institutions rather than a long tail, and the trust boundary is real because no single custodian should control the register. That combination is rare here.

Know which instrument you are holding

A tokenized deposit is a commercial bank liability on a ledger. The holder has a claim on the bank, inside the regulated perimeter, with whatever protections that carries.

A stablecoin is a claim on its issuer, backed by that issuer's reserves, under whatever framework applies. Credit risk, redemption mechanics, regulatory treatment and the holder's position on issuer insolvency all differ.

Any proposal using the terms interchangeably has not worked through the balance sheet consequences, which makes it a useful early filter on vendors and internal business cases alike.

The gates that kill projects regardless of merit

Capital treatment. How the exposure is classified determines what the bank holds against it. Frameworks distinguish tokenized traditional assets meeting certain conditions from other exposures, with materially different consequences, and the area has been moving. If holding the instrument is capital punitive, the case fails before anyone assesses the technology.

Custody and key management. A private key is a bearer instrument, which sits badly against operational norms built on reversibility, dual control and named accountability. Institutional custody means hardware or MPC-based key handling, separation of duties between whoever deploys and whoever controls value, documented rotation and offboarding, and recovery tested before launch rather than designed during an incident. This is usually the hardest internal conversation, well ahead of the contract work.

Third-party dependency. Resilience obligations require banks to manage and evidence their dependencies, and one on a public network or node provider is hard to discharge, because no counterparty is accountable for availability. This shapes network choice as much as any technical factor.

Compliance runs through all of it. Transfers must carry originator and beneficiary information, screening must happen before value moves, and permissionless transferability conflicts with both. Standards for permissioned instruments exist for this reason, and eligibility logic belongs inside the token rather than beside it.

Where it does not belong

Trade finance is the instructive failure. Several high-profile consortium platforms wound down after substantial investment, and the reason was not engineering. The underlying problems are document fraud, credit assessment on unfamiliar counterparties and sanctions screening, none of which sharing documents on a ledger addresses. A fraudulent bill of lading recorded immutably is a fraudulent bill of lading every participant can now rely on.

The second reason is network effects. A platform is useful only once your actual counterparties have joined, and reaching that point is commercial field work rather than development. Most ran out of funding first.

What you should hold at the end

Independent security review should cover key custody, the off-chain services and the integration points, not only the contracts, and repeat after every change to deployed logic.

On ownership: the client holds the keys, repositories, deployment scripts, infrastructure and documentation, with another team able to operate the system from that alone. A bank that cannot operate or audit a settlement component without its original vendor has created a third-party dependency inside a regulated process, which is the problem it was told to manage.

RWaltz is a blockchain and enterprise software development company building custom smart contracts, dApps and tokenization platforms that integrate with existing business systems. We work to a build-to-own model: clients hold their keys, repositories and intellectual property; engagements are scoped honestly, including the cases where an existing scheme or a shared database is the better answer; and security review is treated as continuous rather than a single sign-off.

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