Coin

// Submitted by EthereumHistory (ethereumhistory.com)
contract Coin {
    address minter;
    uint supply;
    mapping (address => uint) balances;

    event Send(address from, address to, uint amount);

    function Coin() {
        minter = msg.sender;
    }

    function mint(address receiver, uint amount) {
        if (msg.sender != minter) return;
        balances[receiver] += amount;
    }

    function send(address receiver, uint amount) {
        if (balances[msg.sender] < amount) return;
        balances[msg.sender] -= amount;
        balances[receiver] += amount;
        Send(msg.sender, receiver, amount);
    }

    function queryBalance(address addr) returns (uint balance) {
        if (msg.sender != minter) return;
        return balances[addr];
    }

    function deposit() {
        balances[msg.sender] += msg.value;
    }
}