code: static BlockCanaryInternals getInstance() {
          if (sInstance == null) {
              synchronized (BlockCanaryInternals.class) {
                  if (sInstance == null) {
                      sInstance = new BlockCanaryInternals();
                  }
              }
          }
          return sInstance;
      }
docs: Get BlockCanaryInternals singleton
  
  @return BlockCanaryInternals instance