HotStuff -------- HotStuff is a general-purpose BFT state machine replication library with modularity and simplicity, suitable for building hybrid consensus cryptocurrencies. Features ======== - Simplicity. The protocol core logic implementation is as simple as the one specified in our paper. See ``consensus.h`` and ``consensus.cpp``. - Modular design. You can use abstraction from the lowest level (the core protocol logic) to the highest level (the state machine replication service with network implementation) in your application, or override/redefine the detailed behavior to customize your own consensus. - Liveness decoupled from safety. The liveness logic is entirely decoupled from safety. By defining your own liveness gadget ("PaceMaker"), you can implement your own liveness heuristics/algorithm. The actual performance varies depending on your liveness implementation, but the safety is always intact. - Friendly to blockchain systems. A PaceMaker could potentially be PoW-based and it makes it easier to build a hybrid consensus system, or use it at the core of some cryptocurrencies. - Minimal. The project strives to keep code base small and implement just the basic functionality of state machine replication: to deliver a consistent command sequence to the library user. Application-specific parts are not included, but demonstrated in the demo program. Try the Current Version ======================= NOTICE: the project is still in-progress. Try at your own risk, and this section may be incomplete and subject to changes. :: # ensure openssl and libevent are installed on your machine cmake -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED=ON -DHOTSTUFF_PROTO_LOG=ON make # start 4 demo replicas with ./run_replicas.sh # start the demo client with ./run_client.sh