byte[] val2 = Hex.decode("40");
byte[] val3 = Hex.decode("94412e0c4f0102f3f0ac63f0a125bce36ca75d4e0d");
byte[] val4 = Hex.decode("01");
TrieImpl storage = new TrieImpl(new MockDB());
storage.update(key1, val1);
storage.update(key2, val2);
storage.update(key3, val3);
storage.update(key4, val4);
String hash = Hex.toHexString(storage.getRootHash());