debt.sol

contract Debt{
    Token currencyTokenContract;
    address issuer;
    address owner;
    bool free;
    uint value;
    
    function Debt(Token _currency, uint _value){ //contract issue
        issuer=msg.sender;
        currencyTokenContract = _currency;
        value = _value;
        free=true;
    }
    
    function join(uint _value) public{
        if(free && _value==value){
            owner=msg.sender;
            free = false;
            if(!currencyTokenContract.transferFrom(msg.sender,issuer,_value))
                throw;
        }
        else throw;
    }
    function execute() public returns (bool) {
        if(msg.sender!=owner)
            throw;
        if(currencyTokenContract.transferFrom(issuer,owner,value)){
            owner=0;
            free = true;
           return true;
        }
        else return false;
    }
}

contract Issuer{
    address owner;
    
    function Issuer(){
        owner=msg.sender;
    }
    
    function issueDebt(Token _currency, uint _value) public{
        Debt debtContract = new Debt(_currency, _value);
        _currency.approve(debtContract,_value);
    }
}