Tamper-Evident Audit Trails for Banking Data

Financial institutions operate in an environment where the integrity and traceability of data are critical. Changes to sensitive records must be reliably documented, and organizations need to be able to demonstrate when information was created or modified without relying solely on the system in which that information is stored.

CoreLedger supported the development of a Proof of Concept (PoC) to explore how blockchain technology could provide an independent, tamper-evident audit layer for banking data.

The Challenge

The objective was to demonstrate a system in which changes to data could be transparently traced while the integrity of historical records remained verifiable.

Implementing such a system involves more than simply storing information on a blockchain.

A number of architectural decisions need to be made:

• What information should be recorded on-chain?
• Should the original data be stored, or only a cryptographic hash representing it?
• How should records be timestamped and transactions signed?
• And which blockchain infrastructure is appropriate for the required level of security, privacy and auditability?

The goal was therefore to design an architecture that could provide verifiable evidence of data integrity without unnecessarily exposing sensitive banking information.

The Solution

CoreLedger provided both the technical expertise and the blockchain infrastructure required to translate these requirements into a working application.

The chosen architecture used blockchain technology as an independent verification layer. Cryptographic proofs of relevant records and changes could be anchored to the blockchain, creating a durable, tamper-evident history. This made it possible to verify retrospectively whether information had been changed and when the corresponding record had been created.

Rather than developing the required blockchain functionality from scratch, the PoC used CoreLedger technology and existing components, including the SparkNet blockchain and the Notrzr web and mobile applications. This significantly reduced the effort required to move from the initial concept to a functional implementation.

CoreLedger also provided architectural and technical consulting throughout the project, helping to evaluate implementation alternatives and determine how blockchain should be integrated into the overall solution.

The Result

The project resulted in a functional Proof of Concept developed in collaboration with a Swiss bank. The implementation demonstrated how blockchain can provide an additional audit and verification layer for existing banking systems without storing the underlying business data on-chain.

The PoC showed that blockchain technology can be used to establish independently verifiable records of data events, providing a technical foundation for stronger auditability, traceability and data integrity.

More broadly, the project illustrates an important enterprise blockchain use case beyond cryptocurrencies and tokenization: using distributed ledger technology as a trusted verification layer for conventional business applications and data.

The Proof of Concept was developed as part of a university project within the Certificate of Advanced Studies (CAS) Blockchain program at the Lucerne University of Applied Sciences and Arts (HSLU).