Category: Blockchain
Service: Amazon Quantum Ledger Database (QLDB)
Answer:
Amazon QLDB is designed to provide a centralized, transparent, and immutable ledger for applications that require a high degree of data integrity and verifiability. It uses a unique approach to transaction processing and validation called the journal-first model.
In the journal-first model, transactions are first recorded in an append-only journal, which serves as the source of truth for the ledger. Once the transactions are recorded in the journal, they are validated by running them through a set of pre-defined rules and constraints, known as PartiQL queries, which can be customized based on the specific needs of the application.
If the transaction passes the validation checks, it is committed to the ledger, and the journal is updated to reflect the new state of the ledger. This process ensures that all transactions are immutable and auditable, and that the integrity of the ledger is maintained at all times.
One of the key benefits of this approach is that it provides a tamper-proof and verifiable history of all transactions, without the need for expensive and complex consensus algorithms, which are typically required by other distributed ledger technologies. This results in a more efficient, scalable, and cost-effective solution for applications that require high data integrity and transparency.
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