Imagine a world where banks, businesses, and customers can all verify the accuracy and history of financial transactions with ease. This vision becomes a reality with Amazon Quantum Ledger Database (OLDB).

Here’s how QLDB can revolutionize digital banking:

Immutable Audit Trail

Unlike traditional databases, QLDB maintains an immutable audit trail, a permanent and tamper-proof record of every transaction. This means no changes can be deleted or hidden, ensuring complete transparency.

Scenario: Verifying Invoice Payments

  • A bank can share a digital invoice with a customer for a loan payment.
  • The customer can access the invoice directly within QLDB and verify its authenticity.
  • After making the payment, the bank can update the invoice status in QLDB to “paid” and include the payment transfer details.
  • Both the bank and the customer can access the complete history of the invoice, including the original amount, any adjustments made, and the final payment details. This fosters trust and eliminates disputes.

Use Case Overview: Tracking Account Activity with Secure and Verifiable Transactions in QLDB


Traditional databases can be vulnerable to unauthorized modifications, making it difficult to maintain a completely accurate and verifiable record of account activity. This can lead to challenges with fraud detection, reconciliation errors, and customer trust.


Amazon QLDB provides a fully managed ledger database specifically designed for scenarios requiring secure and verifiable transaction records.


The application architecture contains the following elements:

  1. Amazon API Gateway exposes REST APIs to perform the major operations on the documents stored in Amazon QLDB, and exposes some of the main features of the service, such as document integrity verification and history retrieval.
  2. AWS Lambda hosts function interacting with Amazon QLDB. The function transforms the requests coming from the API Gateway to the function calls of the Amazon QLDB key-value store library for NodeJS and returns the results from Amazon QLDB.
  3. Amazon QLDB is an immutable storage with cryptographic verification that keeps track of all changes to the invoice information and guarantees its integrity.
How it Works:
  1. Transaction Recording: Every financial transaction, such as deposits, withdrawals, and transfers, is recorded in the QLDB ledger. Each transaction includes details like amount, date, account information, and any relevant reference data.
  2. Immutable History:  Transactions are cryptographically hashed and stored immutably within QLDB. This ensures that no existing transaction can be altered or deleted, preserving a complete and verifiable audit trail.
  3. Real-Time Visibility:  Customers can access their account activity in real-time through secure channels. QLDB allows them to view the complete history of their transactions, including details and timestamps.
  4. Fraud Detection:  The immutable nature of QLDB transactions makes it easier to detect and investigate fraudulent activity. Any attempt to tamper with transaction data would be immediately recognizable within the audit trail.
  5. Dispute Resolution:  In case of a dispute regarding account activity, the verifiable record in QLDB provides a clear and reliable source of truth. This simplifies dispute resolution for both customers and the bank.
  • Enhanced Security: QLDB’s immutability safeguards transaction data from unauthorized modifications, minimizing fraud risk.
  • Improved Customer Experience: Customers gain real-time access to a clear and verifiable record of their account activity, fostering trust and transparency.
  • Streamlined Reconciliation: Reconciling accounts becomes effortless with a complete and auditable history of all transactions.
  • Reduced Operational Costs: Automating record-keeping and streamlining dispute resolution can lead to significant cost savings.

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