Amazon Quantum Ledger Database Is Now Generally Available

QLDB is a managed blockchain service from AWS that offers an immutable, cryptographically verifiable ledger with a central trusted authority.

Recently, Amazon announced the general availability of its Amazon Quantum Ledger Database - AWS QLDB, a managed blockchain service that offers an immutable, cryptographically verifiable ledger for applications that need a central trusted authority.
Amazon had introduced AWS QLDB alongside Amazon Managed Blockchain at it's re:Invent conference last year. Amazon Managed Blockchain is a service that allows users to create fully managed and scalable blockchain networks based on Ethereum or HyperLedger technology.
According to Amazon, QLDB is simple to get up and running and it can be used to store both structured and unstructured data.
Amazon Quantum Ledger Database is serverless, you don’t have to provision capacity or configure read and write limits. You just need to create a ledger, define tables, and QLDB will automatically scale to support application demands. You pay only for the reads, writes, and storage you use.
Amazon Quantum Ledger Database 
Source: AWS 
Also, QLDB does not require distributed consensus. This enables it to execute two to three times as many transactions in the same time as common blockchain frameworks.
Shawn Bice, VP, Databases, Amazon Web Services, Inc. said, "Today, we are proud to announce Amazon QLDB, offering customers a fully managed service that provides the same ledger capabilities, along with the ability to cryptographically verify data integrity."