@Override
  public void fireNewUnverifiedForkchoiceEvent(
      final Hash headBlockHash, final Hash safeBlockHash, final Hash finalizedBlockHash) {
    final ForkchoiceEvent event =
        new ForkchoiceEvent(headBlockHash, safeBlockHash, finalizedBlockHash);
    newUnverifiedForkchoiceCallbackSubscribers.forEach(cb -> cb.onNewUnverifiedForkchoice(event));
  }
Instantiates a new Post merge context.

@param difficulty the difficulty
consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/PostMergeContext.java