@Override
  public Bytes getEncodedBytesRef() {
    // If this node was stored, then it must have a rlp larger than a hash
    return RLP.encodeOne(hash);
  }
Marks the node as being modified (needs to be persisted);
ethereum/trie/src/main/java/org/hyperledger/besu/ethereum/trie/StoredNode.java