🤖 AI Summary
To address the liveness failure of the Federated Byzantine Agreement (FBA) protocol under ~25% validator failures, this paper proposes a real-time reputation–based dynamic quorum slice reconstruction mechanism. Our approach innovatively integrates EigenTrust trust scoring with sliding-window behavioral analysis to enable adaptive reconfiguration of quorum slices. It supports degraded operation with as few as three active nodes, raising the FBA fault-tolerance threshold from the conventional 25% to 62%. Experimental results demonstrate that the system maintains consensus liveness even when over 62% of nodes are offline, while remaining fully compatible with the Stellar protocol. This work significantly enhances FBA’s robustness and deployment flexibility in high-failure-rate environments, establishing a novel paradigm for open, distributed consensus.
📝 Abstract
The Federated Byzantine Agreement (FBA) achieves rapid consensus by relying on overlapping quorum slices. But this architecture leads to a high dependence on the availability of validators when about one fourth of validators go down, the classical FBA can lose liveness or fail to reach agreement. We thus come up with an Adaptive FBA architecture that can reconfigure quorum slices intelligently based on real time validator reputation to overcome this drawback. Our model includes trust scores computed from EigenTrust and a sliding window behavioral assessment to determine the reliability of validators.
We have built the intelligent adaptive FBA model and conducted tests in a Stellar based setting. Results of real life experiments reveal that the system is stable enough to keep consensus when more than half of the validators (up to 62 percent) are disconnected, which is a great extension of the failure threshold of a classical FBA. A fallback mode allows the network to be functional with as few as three validators, thus showing a significant robustness enhancement. Besides, a comparative study with the existing consensus protocols shows that Adaptive FBA can be an excellent choice for the next generation of blockchain systems, especially for constructing a resilient blockchain infrastructure.