BBCA-LEDGER: High Throughput Consensus meets Low Latency - Chrysoula Stathakopoulou

Chrysoula Stathakopoulou (Chainlink Labs), Michael Wei (Chainlink Labs, VMware Research), Hongbo Zhang (Chainlink Labs, Cornell University), Maofan Yin (Chainlink Labs), Dahlia Malkhi (Chainlink Labs)

This paper presents BBCA-LEDGER, a Byzantine fault tolerant log replication technology for partially synchronous networks that enables reaching fast consensus on a total order of transactions while allowing parallel, non-blocking transaction dissemination. The core of BBCA-LEDGERis a novel primitive called BBCA, a consistent broadcast enhanced with unique sequence numbering enforcement. In steady state, BBCA ensures that a transaction can be committed with low latency, in just 3 network steps. Under network partitions or faults, a direct acyclic graph (DAG) formed by BBCA is employed as a fallback mechanism, retaining utility of accumulating parallel broadcasts and committing them via the DAG.

ConsensusDays 23 Session 2.3- Latency Optimisation
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Playlist: ConsensusDays 23