Amazon Quantum Ledger Database (QLDB) is a fully managed, scalable, serverless database. QLDB is designed to provide a transparent and cryptographically verifiable ledger that allows users to build application with an immutable and tamper-evident transaction history. QLDB is centralised with a central authority component and it manages a complete and immutable history of all changes to the ledger.
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Reference - Udemy Ultimate AWS Certified Cloud Practitioner CLF-C02