Resolving Blockchain's Immutable Dilemma
Amritesh Kumar, Monu Nagar, Lokendra Vishwakarma, Debasis Das · 2025
Redactable blockchain presents a solution for fraudulent transaction modification and storage overload by allowing limited data manipulation using Chameleon Hash Functions (CHF). However, CHF-based redactable blockchain encounters significant security challenges like misuse of edit rights, node desynchronization, higher transaction verification, and redaction latency. To solve these challenges, we propose SERB, a secure and efficient redactable blockchain protocol. SERB utilizes a Node Selection, Redactable Consensus, and novel Parameterized Chameleon Hash Function (pCHF) for proper use of edit rights and node synchronization with minimization of transaction verification and redaction latency. The security analysis shows that SERB is secured against tampering attacks, collusion attacks, and forged attacks. The performance analysis indicates that the SERB reduces transaction verification latency by 20% and minimizes redaction latency, such as transaction modification by 25 % and block deletion by$\mathbf{5 0 \%}$compared to state-of-the-art approaches.