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After analysis of data, the JSON document is stored in QLDB. As the documents arrive, they will be stored in the journal one after another. If any document is changed, then a copy of it is maintained in a ledger called history. The rest remain in the current ledger. So, whatever data is in QLDB even if it gets deleted or updated is stored in the ledger and is easily viewable. For verifying data in QLDB, a SHA-256 secure hash file is generated from where the integrity of the data can be verified.