A stable liveness guarantee ensures that a distributed system will continue to make progress and process new transactions, even under adverse network conditions or partial node failures. This guarantee confirms that the system will not halt or become unresponsive, thereby maintaining its operational availability. In blockchain consensus protocols, it signifies that new blocks will always be added to the chain, preventing network stagnation. It is a critical property for reliable and continuously operating decentralized networks.
Context
Ensuring stable liveness is a fundamental design goal for robust blockchain protocols, particularly in the face of network partitions or malicious attacks. Discussions often involve the trade-offs between liveness and safety (ensuring all honest nodes agree on the same sequence of events). Different consensus mechanisms offer varying degrees of liveness guarantees under specific fault models. Future research focuses on developing protocols that provide stronger liveness guarantees without compromising security, thereby enhancing the dependability of decentralized applications.
This leaderless, asynchronous BFT protocol uses concurrent transaction processing and a novel threshold signature to achieve optimal two-round finality and linear communication.
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