@Override
  public Optional<Block> createBlock(final BlockHeader parentHeader, final long timestamp) {
    return Optional.empty();
  }
Instantiates a new Migrating mining coordinator.

@param miningCoordinatorSchedule the mining coordinator schedule
@param blockchain the blockchain
consensus/common/src/main/java/org/hyperledger/besu/consensus/common/MigratingMiningCoordinator.java