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ComChain: A Blockchain with Byzantine Fault Tolerant Reconfiguration

Concurrency and Computation, Practice and Experience, 2020. Proceedings of the IEEE International Conference on Blockchain.

Authored by:
Guillaume Vizier, Ecole Polytechnique
Vincent Gramoli, University of Sydney


As an alternative to the energy greedy proof-of-work, new blockchains constrain the set of participants whose selection is debatable. These blockchains typically allow a fixed consortium of machines to decide upon new transaction blocks. In this paper, we introduce the community blockchain that bridges the gap between these public blockchains and constrained blockchains. The idea is to allow potentially all participants to decide upon “some” block while restricting the set of participants deciding upon “one” block. We also propose an implementation called ComChain that builds upon the Red Belly Blockchain, the fastest blockchain we are aware of. It runs a consensus among the existing community to elect a new community. This reconfiguration speeds up as the number of removed nodes increases.

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