Amazon Quantum Ledger Database (QLDB)

Amazon QLDB (for Quantum Ledger Database) is a fully managed ledger database that provides what the vendor describes as a transparent, immutable, and cryptographically verifiable transaction log ‎owned by a central trusted authority. Amazon QLDB can be used to track each and every application data change and maintains a complete and verifiable history of changes over time. Notably, with QLDB data’s change history is immutable – it cannot be altered or deleted – and using cryptography, users can verify that there have been no unintended modifications to application data. Its immutable transactional log, known as a journal, tracks each application data change and maintains a complete and verifiable history of changes over time.