EEA Publishes QBFT Blockchain Consensus Protocol


At present EEA is proud to publish the QBFT Blockchain Consensus Protocol, a Byzantine Fault-Tolerant Proof-of-Authority consensus algorithm designed for Consortium use. QBFT is an evolution of the “Istanbul BFT Consensus” algorithm (IBFT) described in EIP-650 that gives enhancements in reliability and velocity, and with as few as 2/3 of validators functioning appropriately at any given time it is not going to stall nor produce forks.

As a result of a number of shoppers implement the EEA QBFT Specification, it offers a typical that companies constructing on Ethereum can use on an Enterprise Ethereum community, enabling individuals to run their most popular consumer software program as a validator quite than having to decide on one particular consumer that each one members within the community are pressured to make use of.

— Chaals Nevile, EEA Technical Packages Director

As early as 2018 EEA Members together with BlockApps, Clearmatics, ConsenSys and JP Morgan Chase had recognized conditions and configurations the place IBFT would fail, and started work on evolving the algorithm. The QBFT algorithm was written in Dafny by Roberto Saltini, enabling formal verification of its correctness, primarily based on work finished by Henrique Moniz to use the outcomes of EEA’s discussions and enhancements.

QBFT permits the set of validators to be modified, for instance to incorporate new members in a consortium community or to cope with members leaving, to stability the price of working validators, or to make sure that no participant has an extra proportion of validators at any given time.

QBFT is constructed on well-established and time-proven Byzantine Fault Tolerant consensus ideas. With our work it additionally depends on the protection and safety ensures supplied by formal verification which has allowed us to establish and repair some previous points with IBFT that in sure configurations might develop into critical issues.

— Roberto Saltini, Lead Researcher at ConsenSys, and creator of the QBFT Blockchain Consensus Protocol Specification

The present model of the specification offers Dafny code with feedback and commentary to unambiguously outline the algorithm. QBFT Consensus is applied in open-source Enterprise Ethereum Shoppers together with GoQuorum and Hyperledger Besu, and is being utilized in a number of tasks by EEA members and others, in addition to getting used on EEA’s testnet.

QBFT is utilized in manufacturing at this time by consortiums. EEA’s publication of QBFT as a typical is a superb assist to create new actors constructing on the protocol. I’m excited for the chances provided by this work, as I host a testnet for the EEA utilizing this consensus algorithm.

— Antoine Toulmé, founding father of The Machine Consultancy, and chair of EEA’s Testnet Working Group

The specification is freely out there and may be applied by anybody, underneath the phrases of the Apache 2 open supply license.


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