function adminRemoveTrustedCurrencyContract(address _oldTrustedContractAddress)
        external
        onlyOwner
    {
        require(trustedCurrencyContracts[_oldTrustedContractAddress] != 0);
        trustedCurrencyContracts[_oldTrustedContractAddress] = 0;
        RemoveTrustedContract(_oldTrustedContractAddress);
    }