@Override
  public void becomeImmutable() {
    immutable = true;
  }
Does this account have any storage slots that are set to non-zero values?

@return true if the account has no storage values set to non-zero values. False if any storage
    is set.
evm/src/main/java/org/hyperledger/besu/evm/worldstate/UpdateTrackingAccount.java