Architecting Immutable Data Integrity with Amazon QLDB and Blockchain

In the current landscape of ransomware and sophisticated SQL injection attacks, standard database security is no longer sufficient. We rely heavily on cryptographic hashes (such as SHA-256) to verify data integrity. The logic is simple: if the hash changes, the data was altered. But there is a flaw in this logic. If an attacker gains administrative access to your database, they can modify the data and the stored hash simultaneously. The “seal” is broken, and you have no way of proving the original state of the document.