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Cross shard leader accountability protocol based on two phase atomic commit.

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This study introduces the Cross shard leader accountability protocol (CSLAP) to enhance blockchain sharding security. CSLAP improves inter-shard communication by reducing reliance on single shard leaders and mitigating Byzantine attacks.

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Area of Science:

  • Computer Science
  • Distributed Systems
  • Cybersecurity

Background:

  • Blockchain sharding enhances performance and scalability but faces challenges in inter-shard communication.
  • Shard leaders are critical for communication, but vulnerable to Byzantine attacks, compromising system integrity.
  • Current designs lack mechanisms for shard members to monitor inter-shard communication activities.

Purpose of the Study:

  • To propose a novel protocol, Cross shard leader accountability protocol (CSLAP), to address security vulnerabilities in blockchain sharding.
  • To enhance the reliability and efficiency of inter-shard communication by mitigating risks associated with malicious shard leaders.

Main Methods:

  • CSLAP is based on the two-phase atomic commit protocol (2PC) and utilizes Byzantine broadcast/Byzantine agreement (BB/BA) for fault tolerance.
  • The protocol generates cross-shard leader re-election certificates to minimize the impact of compromised shard leaders.
  • A Round-robin mechanism is employed to facilitate efficient leader re-election processes.

Main Results:

  • CSLAP effectively maintains the security and liveness of sharding transactions.
  • The protocol significantly reduces communication latency in cross-shard interactions.
  • Experimental comparisons show CSLAP outperforms existing cross-shard protocols in reducing communication latency.

Conclusions:

  • CSLAP offers a robust solution for secure and efficient blockchain sharding by ensuring leader accountability.
  • The protocol enhances Byzantine fault tolerance in inter-shard communication, improving overall system resilience.
  • CSLAP represents a significant advancement in optimizing blockchain sharding performance and security.