A blockchain in finance is a distributed ledger approach used to record and validate transactions across multiple parties. In banking, it is often discussed for payments, settlement, and shared transaction records. Its value depends on whether it reduces coordination friction while preserving governance, auditability, and clear accountability across institutions.
Expanded Definition
Blockchain in finance refers to using a distributed ledger to record financial events across multiple parties so that transactions can be verified, reconciled, and audited without relying on a single internal database as the sole source of truth. Its strongest use cases involve shared records, controlled settlement, and traceable state changes. In practice, the term is broader than cryptocurrency: it can describe permissioned networks among banks, tokenised assets, interbank reconciliation, or shared payment rails. Standards and vendor language still vary, so “blockchain” may describe anything from a tightly governed consortium ledger to a loosely decentralised network. That distinction matters because financial institutions usually need governance, legal accountability, and data minimisation more than public decentralisation. For control planning, this is best read alongside NIST Cybersecurity Framework 2.0, which emphasises identity, integrity, and recovery rather than the ledger label itself. The most common misapplication is treating blockchain as an automatic trust substitute, which occurs when teams assume shared infrastructure removes the need for entitlement control, transaction validation, and exception handling.
Examples and Use Cases
Implementing blockchain rigorously often introduces governance overhead, requiring organisations to weigh faster multi-party reconciliation against the cost of operating a shared control model.
- Interbank settlement can use a permissioned ledger to reduce reconciliation delays, but only if participating institutions agree on finality rules and operator responsibilities.
- Trade finance workflows can record document handoffs and approvals on-chain, helping multiple parties verify status without exchanging duplicate records.
- Tokenised deposits or assets may use a ledger to track ownership changes, while off-chain systems enforce customer due diligence, sanctions screening, and access controls.
- Shared audit trails can improve post-transaction investigation, especially when a finance platform needs to correlate actions across firms and business units.
- For identity-linked workflows, blockchain records are only useful if the underlying service accounts and keys are managed as NHIs, a risk area discussed in LLMjacking: How Attackers Hijack AI Using Compromised NHIs and in the context of exposed secrets in The State of Secrets in AppSec.
In implementation terms, financial blockchain often intersects with shared key custody, API authentication, and ledger node administration. Public blockchain design patterns are not a default fit for regulated finance, where permission boundaries and audit duties are tighter than in open networks. When teams want a baseline for identity and access alignment, the NIST Cybersecurity Framework 2.0 remains the more reliable control lens than the technology choice alone.
Why It Matters in NHI Security
Blockchain projects in finance often fail for security reasons that have little to do with the ledger algorithm and everything to do with NHIs, secrets, and orchestration. The ledger may be immutable, but the surrounding ecosystem is not. Validator nodes, signing services, settlement APIs, oracle integrations, and administrative consoles all depend on credentials that can be stolen, over-privileged, or reused across environments. That is why blockchain programs must be assessed as an NHI problem as much as a data architecture problem. NHIMG research on secrets management shows that only 44% of developers follow security best practices for secrets management, and leaked secrets can take an average of 27 days to remediate, which is far too slow for time-sensitive financial rails. This risk is amplified when institutions treat chain participation as a governance shortcut instead of a control surface. The security objective is not simply to make records tamper-evident, but to ensure the identities that write those records are tightly scoped, monitored, and recoverable. Organisational exposure usually becomes visible only after a compromised signing key, failed settlement, or anomalous node action forces incident response, at which point blockchain governance becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST CSF 2.0, NIST Zero Trust (SP 800-207), NIST SP 800-63 and NIST AI RMF set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Blockchain finance relies on secrets, keys, and service identities that fit NHI secret-management risk. |
| NIST CSF 2.0 | PR.AC-4 | Shared ledger access depends on tightly managed identities and authorization boundaries. |
| NIST Zero Trust (SP 800-207) | Blockchain does not remove the need to continuously verify identities, devices, and transactions. | |
| NIST SP 800-63 | IAL2 | Financial workflows need assurance for the identities authorizing ledger actions and approvals. |
| NIST AI RMF | When blockchain platforms use AI for routing or anomaly detection, governance must cover model risk too. |
Inventory ledger keys, node credentials, and API secrets, then enforce rotation, vaulting, and least privilege.
Related resources from NHI Mgmt Group
- How should security teams govern device-bound payment credentials in open finance?
- How should organisations calculate AI ROI across security, finance and productivity goals?
- Who is accountable when an AI system in finance makes a policy-relevant decision?
- Why does segregation of duties matter for IAM programmes beyond finance?
