Definition ∞ Chain immutability signifies the unalterable nature of recorded transactions on a blockchain once they are confirmed and added to the distributed ledger. This property ensures that historical data cannot be modified or deleted, thereby preserving the integrity and chronological order of all entries. It forms a foundational security principle, providing a verifiable and trustworthy record of events. The cryptographic linking of blocks contributes significantly to this characteristic.
Context ∞ Chain immutability is a core technical attribute frequently highlighted in discussions about blockchain security and data integrity. While generally considered a strength, debates arise concerning its implications for data privacy regulations, such as the right to be forgotten, and the potential for rectifying errors or fraudulent transactions. The ongoing discourse addresses methods for managing data within immutable structures while complying with legal and ethical requirements.
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