Immutability Meaning

The characteristic of being unchangeable. In a ledger system, this means that once a transaction has been confirmed and added to the chain, it cannot be altered, deleted, or rolled back.

This property is enforced through cryptographic hashing, where each block contains the "fingerprint" of the previous one. This provides a "source of truth" that does not require a central authority to verify.

Because no one-not even the developers of the network-can change the history of transactions, the system is resistant to censorship and fraud. It ensures that the historical record remains an honest account of all activity.

However, immutability is a double-edged sword. If a user makes a mistake, such as sending funds to the wrong address, the transaction cannot be undone.

This "permanence" requires a high level of user responsibility and has led to the development of safer interfaces and multisig arrangements to prevent accidental loss.