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Immutability refers to the property of data remaining unchangeable after it's recorded. Once data is added to a block in the chain, it becomes extremely difficult to modify. This aspect enhances security, trust, and transparency, as the historical record remains intact and tamper-proof. Immutability is achieved through the consensus mechanism, ensuring that changes require agreement from the network, making unauthorized alterations virtually impossible. This characteristic is particularly valuable for maintaining accurate and auditable records, as well as fostering trust among participants.