function getLockedBalanceOf (address account, address tokenAddr)
        external
        view
        returns (uint256) 
    {
        require(account != address(0x0));

        uint256 balance = 0;
        for(uint256 i = 0; i < lockedBalances[account][tokenAddr].length; i++) {
            if(lockedBalances[account][tokenAddr][i].releaseTime > block.timestamp) {
                balance = balance.add(lockedBalances[account][tokenAddr][i].balance);
            }
        }
        return balance;
    }