Abstract

The immutability of blockchain means that data in blockchain cannot be modified once confirmed. It guarantees the reliability and integrity of blockchain. However, absolute immutability is not conducive to timely correction of blockchain. Currently, there are some researches on redactable blockchain. They replaced hash functions with chameleon hash functions or proposed policy-based chameleon hashes, which may lead to the centralization of redaction right or single point of failure.

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