@Override
  public boolean submitWork(final PoWSolution solution) {
    synchronized (this) {
      return currentRunningMiner.map(miner -> miner.submitWork(solution)).orElse(false);
    }
  }
Responsible for determining when a block mining operation should be started/stopped, then
creating an appropriate miner and starting it running in a thread.
ethereum/blockcreation/src/main/java/org/hyperledger/besu/ethereum/blockcreation/PoWMiningCoordinator.java