public void start() {
started.set(true);
// RejectedExecutionHandler implementation
rejectionHandler = new RejectionLogger();
// Get the ThreadFactory implementation to use
threadFactory = Executors.defaultThreadFactory();
MinerThread mt1 = new MinerThread("miner1", this, Hex.decode("2bd26d8f796719923ff13d295644f9b45db1f730"));