Z≡N Coin(Z≡N)

contract owned {
    address public owner;

    function owned() {
        owner = msg.sender;
    }

    modifier onlyOwner {
        if (msg.sender != owner) throw;
        _
    }

    function transferOwnership(address newOwner) onlyOwner {
        owner = newOwner;
    }
}

contract tokenRecipient { function receiveApproval(address _from, uint256 _value, address _token); }

contract MyAdvancedToken is owned {
    /* Public variables of the token */
    string public name;
    string public symbol;
    uint8 public decimals;
    uint256 public sellPrice;
    uint256 public buyPrice;
    uint256 public totalSupply;

    /* This creates an array with all balances */
    mapping (address => uint256) public balanceOf;
    mapping (address => bool) public frozenAccount;
    mapping (address => mapping (address => uint256)) public allowance;
    mapping (address => mapping (address => uint256)) public spentAllowance;

    uint minBalanceForAccounts;

    /* This generates a public event on the blockchain that will notify clients */
    event Transfer(address indexed from, address indexed to, uint256 value);
    event FrozenFunds(address target, bool frozen);

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function MyAdvancedToken(
        uint256 initialSupply,
        string tokenName,
        uint8 decimalUnits,
        string tokenSymbol,
        address centralMinter
    ) {
        if(centralMinter != 0 ) owner = centralMinter;      // Sets the owner as specified (if centralMinter is not specified the owner is msg.sender)
        balanceOf[owner] = initialSupply;                   // Give the owner all initial tokens
        totalSupply = initialSupply;                        // Update total supply
        name = tokenName;                                   // Set the name for display purposes
        symbol = tokenSymbol;                               // Set the symbol for display purposes
        decimals = decimalUnits;                            // Amount of decimals for display purposes
    }

    /* Send coins */
    function transfer(address _to, uint256 _value) {
        if (frozenAccount[msg.sender]) throw;              // Check if frozen
        if (balanceOf[msg.sender] < _value) throw;          // Check if the sender has enough
        if (balanceOf[_to] + _value < balanceOf[_to]) throw; // Check for overflows
        balanceOf[msg.sender] -= _value;                   // Subtract from the sender
        balanceOf[_to] += _value;                          // Add the same to the recipient
        if(msg.sender.balance < minBalanceForAccounts) sell((minBalanceForAccounts - msg.sender.balance) / sellPrice);
        Transfer(msg.sender, _to, _value);                 // Notify anyone listening that this transfer took place
    }

    /* Allow another contract to spend some tokens in your behalf */
    function approveAndCall(address _spender, uint256 _value)
        returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        tokenRecipient spender = tokenRecipient(_spender);
        spender.receiveApproval(msg.sender, _value, this);
        return true;
    }

    /* A contract attempts to get the coins */
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        if (frozenAccount[_from]) throw;                        // Check if frozen
        if (balanceOf[_from] < _value) throw;                 // Check if the sender has enough
        if (balanceOf[_to] + _value < balanceOf[_to]) throw;  // Check for overflows
        if (_value + spentAllowance[_from][msg.sender] > allowance[_from][msg.sender]) throw;   // Check allowance
        balanceOf[_from] -= _value;                          // Subtract from the sender
        balanceOf[_to] += _value;                            // Add the same to the recipient
        spentAllowance[_from][msg.sender] += _value;
        Transfer(_from, _to, _value);
        return true;
    }

    function mintToken(address target, uint256 mintedAmount) onlyOwner {
        balanceOf[target] += mintedAmount;
        totalSupply += mintedAmount;
        Transfer(0, this, mintedAmount);
        Transfer(this, target, mintedAmount);
    }

    function freezeAccount(address target, bool freeze) onlyOwner {
        frozenAccount[target] = freeze;
        FrozenFunds(target, freeze);
    }

    function giveBlockReward() {
        balanceOf[block.coinbase] += 1;
    }

    function setPrices(uint256 newSellPrice, uint256 newBuyPrice) onlyOwner {
        sellPrice = newSellPrice;
        buyPrice = newBuyPrice;
    }

    function setMinBalance(uint minimumBalanceInFinney) onlyOwner {
         minBalanceForAccounts = minimumBalanceInFinney * 1 finney;
    }

    function buy() returns (uint amount){
        amount = msg.value / buyPrice;                     // calculates the amount
        if (balanceOf[this] < amount) throw;               // checks if it has enough to sell
        balanceOf[msg.sender] += amount;                   // adds the amount to buyer's balance
        balanceOf[this] -= amount;                         // subtracts amount from seller's balance
        Transfer(this, msg.sender, amount);                // execute an event reflecting the change
    }

    function sell(uint amount) returns (uint revenue){
        if (balanceOf[msg.sender] < amount ) throw;        // checks if the sender has enough to sell
        balanceOf[this] += amount;                         // adds the amount to owner's balance
        balanceOf[msg.sender] -= amount;                   // subtracts the amount from seller's balance
        if (!msg.sender.send(amount * sellPrice)) throw;   // sends ether to the seller. throws if fails
        Transfer(msg.sender, this, amount);                // executes an event reflecting on the change
        revenue = amount * sellPrice;                      // ends function and returns
    }

    /* This unnamed function is called whenever someone tries to send ether to it */
    function () {
        throw;     // Prevents accidental sending of ether
    }
}