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Amazon QLDB is a ledger database that provides an immutable, verifiable, transparent, and cryptographically transaction log centrally. It can be used to track and any application data change over time.

However, relational databases are not immutable and changes are hard to track and verify. Alternatively, blockchain frameworks can be used as a ledger but it adds complexity as an entire blockchain network needs to be set up and the nodes are required to validate each transaction before it can be added to the ledger.

With Amazon QLDB, effort of building your own ledger-like applications is eliminated. QLDB is immutable; it cannot be altered or deleted and can be easily verifiable if any unintended modifications are made. QLDB provides SQL-like API, a flexible document data model, and full support for transactions. With QLDB data can be replicated to other AWS services to support advanced analytical processing. QLDB is serverless so it is scalable according to my needs so I pay for what I use. In our proposed model, all the records of data and various other files are stored and maintained in QLDB.