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Byzantine-fault-tolerant (BFT) protocols underlie a variety of decentralizedapplications including payments, auctions, data feed oracles, and decentralizedsocial networks\cite{chainlink,lens}. In most leader-based BFT protocols, animportant property that has been missing is the censorship resistance oftransaction in the short term. The protocol should provide inclusion guaranteesin the next block height even if the current and future leaders have the intentof censoring.In this paper, we present a BFT system, BigDipper, that achievescensorship resistance while providing fast confirmation for clients andhyperscale throughput. The core idea is to decentralize inclusion oftransactions by allowing every BFT replica to create their own mini-block, andthen enforcing the leader on their inclusions. To achieve this, BigDippercreates a modular system made of three components. First, clients use atransaction broadcast protocol to send transaction to multiple replicas. As adistribution of replicas receiving the client's transactions, they preparemini-blocks to send to the data availability (DA) component, whichcharacterizes the censorship resistant properties of the whole system. Wedesign three censorship resistant DA (DA-CR) protocols whose properties arecaptured by three parameters. The third component interleaves the second DA-CRprotocol into the leader based BFT protocol, it enforces the leader to includeall the data from the DA-CR into the final block. At last, we demonstrate anintegration with a two-phase Hotstuff-2.

BigDipper: A hyperscale BFT system with short term censorship resistance