Flexible Immutability

Definition ∞ Flexible immutability describes a blockchain characteristic where the ledger’s historical records are generally unchangeable, yet specific, predefined mechanisms allow for controlled modifications under exceptional circumstances. This contrasts with absolute immutability, providing a balance between data integrity and necessary adaptability. Such modifications might require a supermajority consensus. This design offers a nuanced approach to data permanence.
Context ∞ This concept is particularly relevant in enterprise blockchain solutions or regulated environments where absolute immutability could conflict with legal requirements for data correction or asset recovery. Debates surround the specific conditions and governance procedures that permit such flexibility without compromising the core security properties of a blockchain. News often highlights protocols that attempt to achieve this critical balance.