Flexico: An efficient dual-mode consensus protocol for blockchain networks

Area of Science:

• Computer Science
• Distributed Systems

Background:

• Blockchain technology relies on Byzantine fault tolerant (BFT) systems for decentralized consensus.
• Traditional BFT protocols often require two communication rounds, even in optimal conditions, to tolerate faults.
• Existing dual-mode protocols have limitations, restricting the fast path to only synchronous, non-faulty networks.

Purpose of the Study:

• To propose a novel dual-mode consensus protocol for asynchronous BFT systems.
• To enhance the performance and efficiency of blockchain consensus mechanisms.
• To improve the balance between protocol efficiency and availability under varying network conditions.

Main Methods:

• Introduced a novel dual-mode protocol with distinct fast and backup subprotocols.
• Utilized active and passive nodes to form separate consensus committees for fast and backup modes.
• Enabled the backup protocol to seamlessly take over from the fast protocol without restarting.

Main Results:

• The proposed protocol achieves consensus with lower communication costs compared to traditional methods.
• Guaranteed safety and liveness of the consensus process under both ideal and non-ideal network conditions.
• Demonstrated improved efficiency and availability by optimizing the consensus process.

Conclusions:

• The novel dual-mode protocol effectively enhances asynchronous BFT performance.
• The system balances efficiency and availability through optimized communication pathways.
• This approach offers a more robust and performant solution for blockchain consensus.