public void blockWritten(SwarmCoordinator swarmCoordinator, Range block) {
   System.out.println("block written: " + block.toString() + "/" + block.getLength());
 }
 public void blockUnpending(SwarmCoordinator swarmCoordinator, Range block) {
   System.out.println("block unpending: " + block.toString() + "/" + block.getLength());
 }
 public void blockVerified(SwarmCoordinator swarmCoordinator, Range block) {
   System.out.println("block verified: " + block.toString() + "/" + block.getLength());
 }