合约验证小技巧

本文给出了验证合约时快速填充构造函数参数的一个小技巧。

我们在做合约验证的时候，如果合约是带构造函数的，并且合约是被优化过的，几乎不可避免的会碰到下面的问题。  因为事先浏览器并不知道我们的编译优化参数，无法准确填充所部署合约的构造函数参数。  正规的解决这个问题的办法，是要比较合约编译出来的字节码和合约部署交易的输入，因为构造函数参数会被放到合约部署交易输入的最后，两者相比较多出来的那部分就是验证合约时要填充的构造函数参数。 这里还有个很简单的小技巧，可以让你快速解决这个问题。 ``` 只需要把第一个 00000000000 之前的部分去掉就好。 ``` 举例说明，把下面的这段 ``` Note: Unable to determine contructor arguments, please check and replace with correct values (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) ``` 变成下面这样就好了: ``` 000000000000000000000000bb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c000000000000000000000000f0700a310cb14615a67eec1a8dad5791859f65f100000000000000000000000061a43f8f65ef35d28e63eadb0224b08944d75afb00000000000000000000000000000000000000000000000000470de4df82000000000000000000000000000000000000000000000000000000000000000001400000000000000000000000000000000000000000000000000000000000000180000000000000000000000000000000000000000000000000000000000000001200000000000000000000000005ddc595fd33d7b2ab302143c420d0e7f21b622a000000000000000000000000c125cc8e28283afd02f908dd10f3ae415f3c5bb700000000000000000000000000000000000000000000000000000000000001c0000000000000000000000000000000000000000000000000000000000000000946696c646120424e420000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000466424e420000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000 ```

我们在做合约验证的时候，如果合约是带构造函数的，并且合约是被优化过的，几乎不可避免的会碰到下面的问题。

因为事先浏览器并不知道我们的编译优化参数，无法准确填充所部署合约的构造函数参数。

正规的解决这个问题的办法，是要比较合约编译出来的字节码和合约部署交易的输入，因为构造函数参数会被放到合约部署交易输入的最后，两者相比较多出来的那部分就是验证合约时要填充的构造函数参数。

这里还有个很简单的小技巧，可以让你快速解决这个问题。

只需要把第一个 00000000000 之前的部分去掉就好。

举例说明，把下面的这段

Note: Unable to determine contructor arguments, please check and replace with correct values (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)

变成下面这样就好了:

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• 发表于 2021-12-13 21:56
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• 分类：Solidity