Definition ∞ An immutable data record is a piece of information that, once written to a storage system, cannot be altered or deleted. On blockchains, this is achieved through cryptographic linking of blocks, where each new block contains a hash of the previous one. This property ensures the integrity and historical accuracy of data over time. It provides a verifiable and tamper-proof log of events or transactions.
Context ∞ The concept of an immutable data record is fundamental to the security and trustworthiness of blockchain technology and many digital assets. News often highlights the benefits of immutability for supply chain tracking, digital identity, and verifiable credentials. Concerns sometimes arise regarding the permanence of incorrect or sensitive data once recorded on an immutable ledger.
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