FBA typically refers to Federated Byzantine Agreement, a consensus mechanism enabling a network of nodes to agree on a single data value, even with malicious or failing nodes. Unlike traditional Byzantine Fault Tolerance (BFT) that assumes global agreement, FBA allows participants to independently choose which other participants to trust. Its core purpose is to achieve reliable consensus in open, decentralized networks where universal trust between all nodes is not presumed.
Mechanism
The operational logic of FBA involves a quorum slice model, where each node selects its own “quorum slice” – a set of nodes it trusts to ensure agreement. A quorum forms when enough quorum slices intersect, guaranteeing that if a transaction is validated by one quorum, it will eventually be validated by all. This mechanism ensures safety and liveness without requiring a global list of trusted validators or a fixed set of participants, promoting decentralization and scalability in protocols like Stellar’s Consensus Protocol.
Methodology
The strategic approach to FBA emphasizes decentralized trust and network robustness against malicious actors. Methodologies involve careful selection of quorum slices by individual nodes, ensuring sufficient overlap to achieve global agreement while avoiding over-reliance on any single entity. This framework allows for the dynamic addition and removal of participants, making it suitable for open blockchain networks where participants are heterogeneous and may not have a prior trust relationship, supporting the integrity of transactions in crypto payment and trading systems.
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