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Consensus protocols for asynchronous networks are usually complex andinefficient, leading practical systems to rely on synchronous protocols. Thispaper attempts to simplify asynchronous consensus by building atop a novelthreshold logical clock abstraction, which enables upper layers to operate asif on a synchronous network. This approach yields an asynchronous consensusprotocol for fail-stop nodes that may be simpler and more robust than Paxos andits leader-based variants, requiring no common coins and achieving consensus ina constant expected number of rounds. The same approach can be strengthenedagainst Byzantine failures by building on well-established techniques such astamper-evident logging and gossip, accountable state machines, thresholdsignatures and witness cosigning, and verifiable secret sharing. Thiscombination of existing abstractions and threshold logical clocks yields amodular, cleanly-layered approach to building practical and efficient Byzantineconsensus, distributed key generation, time, timestamping, and randomnessbeacons, and other critical services.

Threshold Logical Clocks for Asynchronous Distributed Coordination and Consensus