contract ZhaoxiStorage {

    uint storedData;

    function set(uint x) {
        storedData = x;
    }

    function get() constant returns (uint retVal) {
        return storedData;
    }
}

contract ZhaoxiCoin {

    // 關鍵字“public”使變量能從合約外部訪問。
    address public minter;
    mapping (address => uint) public balances;

    // 事件讓輕客戶端能高效的對變化做出反應。
    event Sent(address from, address to, uint amount);

    // 這個構造函數的代碼僅僅只在合約創建的時候被運行。
    function ZhaoxiCoin() {
        minter = msg.sender;
    }

    // 合約創建者可以調用mint
    function mint(address receiver, uint amount) {
        if (msg.sender != minter) return;
        balances[receiver] += amount;
    }

    // send可以被擁有代幣的任何人調用
    function send(address receiver, uint amount) {
        if (balances[msg.sender] < amount) return;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        Sent(msg.sender, receiver, amount);
    }
}
 

function minter() returns (address) { return minter; }

function balances(address _account) returns (uint balance) {
    return balances[_account];
}

ZhaoxiCoin.Sent().watch({}, ‘‘, function(error, result) {
    if (!error) {
        console.log("ZhaoxiCoin transfer: " + result.args.amount +
            " coins were sent from " + result.args.from +
            " to " + result.args.to + ".");
        console.log("Balances now:\n" +
            "Sender: " + ZhaoxiCoin.balances.call(result.args.from) +
            "Receiver: " + ZhaoxiCoin.balances.call(result.args.to));
    }
}