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Title:
Phoenixx: Linear consensus with random sampling
Authors: David Chaum, Bernardo Cardoso, William Carter, Mario Yaksetig, Baltasar Aroso
Abstract:We present Phoenixx, a round and leader based Byzantine fault tolerant consensus protocol, that operates in the partial synchrony network communications model. Phoenixx combines the three phase approach from HotStuff, with a novel \textit{Endorser Sampling}, that selects a subset of nodes, called \textit{endorsers}, to ``compress’’ the opinion of the network.
Unlike traditional sampling approaches that select a subset of the network to run consensus on behalf of the network and disseminate the outcome, Phoenixx still requires participation of the whole network. The endorsers, however, assume a special role as they confirm that at least 2f+1 validators are in agreement and issue a compressed certificate, attesting the network reached a decision.
Phoenixx achieves linear communication complexity, while maintaining safety, liveness, and optimistic responsiveness, without using threshold signatures.
ePrint: https://eprint.iacr.org/2023/1262
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