contract ZeroGold is ERC20Interface, Owned {
    using SafeMath for uint;

    string public symbol;
    string public name;
    uint8  public decimals;
    uint   public _totalSupply;

    mapping(address => uint) balances;
    mapping(address => mapping(address => uint)) allowed;

    /***************************************************************************
     *
     * Constructor
     */
    constructor() public {
        symbol          = '0GOLD';
        name            = 'ZeroGold';
        decimals        = 8;
        _totalSupply    = 21000000 * 10 ** uint(decimals);
        balances[owner] = _totalSupply;

        emit Transfer(address(0), owner, _totalSupply);
    }

    /***************************************************************************
     *
     * Total supply
     */
    function totalSupply() public constant returns (uint) {
        return _totalSupply  - balances[address(0)];
    }

    /***************************************************************************
     *
     * Get the token balance for account `tokenOwner`
     */
    function balanceOf(address tokenOwner) public constant returns (uint balance) {
        return balances[tokenOwner];
    }

    /***************************************************************************
     *
     * Transfer the balance from token owner's account to `to` account
     * - Owner's account must have sufficient balance to transfer
     * - 0 value transfers are allowed
     */
    function transfer(address to, uint tokens) public returns (bool success) {
        balances[msg.sender] = balances[msg.sender].sub(tokens);
        balances[to]         = balances[to].add(tokens);

        emit Transfer(msg.sender, to, tokens);

        return true;
    }

    /***************************************************************************
     *
     * Token owner can approve for `spender` to transferFrom(...) `tokens`
     * from the token owner's account
     *
     * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20-token-standard.md
     * recommends that there are no checks for the approval double-spend attack
     * as this should be implemented in user interfaces
     */
    function approve(address spender, uint tokens) public returns (bool success) {
        allowed[msg.sender][spender] = tokens;

        emit Approval(msg.sender, spender, tokens);

        return true;
    }

    /***************************************************************************
     *
     * Transfer `tokens` from the `from` account to the `to` account.
     *
     * The calling account must already have sufficient tokens approve(...)-d
     * for spending from the `from` account and:
     *     - From account must have sufficient balance to transfer
     *     - Spender must have sufficient allowance to transfer
     *     - 0 value transfers are allowed
     */
    function transferFrom(
        address from, address to, uint tokens) public returns (
        bool success) {
        balances[from]            = balances[from].sub(tokens);
        allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
        balances[to]              = balances[to].add(tokens);

        emit Transfer(from, to, tokens);

        return true;
    }

    /***************************************************************************
     *
     * Returns the amount of tokens approved by the owner that can be
     * transferred to the spender's account
     */
    function allowance(
        address tokenOwner, address spender) public constant returns (
        uint remaining) {
        return allowed[tokenOwner][spender];
    }

    /***************************************************************************
     *
     * Token owner can approve for `spender` to transferFrom(...) `tokens`
     * from the token owner's account. The `spender` contract function
     * `receiveApproval(...)` is then executed
     */
    function approveAndCall(
        address spender, uint tokens, bytes data) public returns (
        bool success) {
        allowed[msg.sender][spender] = tokens;

        emit Approval(msg.sender, spender, tokens);

        ApproveAndCallFallBack(spender).receiveApproval(msg.sender, tokens, this, data);

        return true;
    }

    /***************************************************************************
     *
     * Don't accept ETH
     */
    function () public payable {
        revert();
    }

    /***************************************************************************
     *
     * Owner can transfer out any accidentally sent ERC20 tokens
     */
    function transferAnyERC20Token(
        address tokenAddress, uint tokens) public onlyOwner returns (
        bool success) {
        return ERC20Interface(tokenAddress).transfer(owner, tokens);
    }
}
/*******************************************************************************
 *
 * @notice ZeroGold DOES NOT HOLD ANY "OFFICIAL" AFFILIATION with ZeroNet Core,
 *         ZeroNet.io nor any of its brands and affiliates.
 *
 *         ZeroGold DOES currently stand as the "OFFICIAL" token of
 *         Zeronet Explorer, Zer0net.com, 0net.io and each of their
 *         respective brands and affiliates.
 *
 *         Symbol       : 0GOLD
 *         Name         : ZeroGold
 *         Total supply : 21,000,000
 *         Decimals     : 8
 *
 * @dev This is a standard ERC20 token contract, utilizing SafeMath along
 *      with a few additional public descriptors:
 *          - name
 *          - symbol
 *          - title
 */
function transferFrom(
    address from, address to, uint tokens) public returns (
    bool success) {
    balances[from]            = balances[from].sub(tokens);
    allowed[from][msg.sender] = allowed[from][msg.sender].sub(tokens);
    balances[to]              = balances[to].add(tokens);

    emit Transfer(from, to, tokens);

    return true;
}

/***************************************************************************
 *
 * Transfer `tokens` from the `from` account to the `to` account.
 *
 * The calling account must already have sufficient tokens approve(...)-d
 * for spending from the `from` account and:
 *     - From account must have sufficient balance to transfer
 *     - Spender must have sufficient allowance to transfer
 *     - 0 value transfers are allowed
 */