BAI合约

智能合约：https://etherscan.io/address/0x14d9779B6585F3A7d4f768383B3cb030705dad2e#code

    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        /// same as above
        require(_to != 0x0);
        require(balances[_from] >= _value);
        require(balances[_to] + _value > balances[_to]);

        uint previousBalances = balances[_from] + balances[_to];
        balances[_from] -= _value;
        balances[_to] += _value;
        allowed[_from][msg.sender] -= _value; //没有检测allowed
        Transfer(_from, _to, _value);
        assert(balances[_from] + balances[_to] == previousBalances);

        return true;
    }

我对比了下BAI和EDU的合约代码，唯一的差异点就是名字和发行量了。

2018-05-29 17-08-13 的屏幕截图.png