Peera is a decentralized questions and answers protocol for Web3 where users can organize and store their interests and skills, creating a common community platform

Peera Meta

Aave is a decentralized non-custodial liquidity protocol where users can participate as depositors or borrowers.

Aave

Solidity is an object-oriented, high-level language for implementing smart contracts. It is a curly-bracket language designed to target the Ethereum Virtual Machine (EVM).

Solidity

Ankr makes accessing Web3 easy for those who want to build and earn on the future web. Ankr is the main infrastructure provider for Polygon, BNB Smart Chain, and Fantom.

Ankr

Vyper is a relatively new, pythonic programming language used to write smart contracts. Vyper targets Ethereum Virtual Machine making it virtually impossible for developers to code misleading programs.

Vyper

Functionland is replacing Cloud Storage and Service Subscription economy by introducing a new category of products, called Blockchain-Attached Storage. It creates value by auto-minting crypto for the users and allocating a share to the developers.

Functionland

Fractal Visions is a builder owned and operated creative web3 NFT project hub and a multifaceted & multidimensional experience. Bridging the gap between the physical and digital world.

Fractal Visions

D_D Academy is an open-source education platform created by the Developer DAO.

D_D Academy

Cyfrin Updraft is an education platform specializing on teaching the next generation of smart contract developers 

Cyfrin Updraft

The Graph is a decentralized protocol for indexing and querying blockchain data. The Graph makes it possible to query data that is difficult to query directly.

The Graph

Polygon is a decentralised Ethereum scaling platform that enables developers to build scalable user-friendly dApps with low transaction fees without ever sacrificing on security.

Polygon

Web3 (also known as Web 3.0) is an idea for a new iteration of the World Wide Web which incorporates concepts such as decentralization, blockchain technologies, and token-based economics.

All Things Web3

Koii is a new way to design communications infrastructure that distributes computing authority across a wider group of personal devices.

Koii Network

谁能告诉我 slither 和 aderyn 是如何安装的，我在安装两者时遇到了严重的问题

can anyone please put me through on how slither and aderyn is installed, im seriously having isses installing both

Slither and Aderyn checks installation

Slither 和 Aderyn 正在检查安装情况

非常感谢 Cyfrin Updraft 给我们这个绝佳的机会！非常感谢有机会和这样一支了不起的团队一起提升我的 Solidity 技能. 对未来的发展感到兴奋——是时候部署并产生影响了！🚀

Big thanks to Cyfrin Updraft for this awesome opportunity! Super grateful for the chance to level up my Solidity skills with such an amazing team. Excited for what’s ahead—time to deploy and make an impact! 🚀

Blockchain developer appreciation

区块链开发者赞赏

大家好，我即将完成 solidity 课程并开始区块链安全课程. 

为了设想自己是一名审计师，你能否分享一下智能合约审计师在任何日常工作中每天需要执行的最常见的任务是什么？

智能合约审计师从开始工作到完成工作的一天是怎样的？

他的老板是否要求在当天或整整一周内制定特定的协议，并在当天或一周结束时发送审计报告？每周都这样，但是代码片段或整个协议不同？

非常感谢

Hi all, I'm about to complete the solidity course and to begin the blockchain security course.

In order to envision myself working as an auditor, can you share what are the most common tasks that smart contract auditors are required to perform on a daily basis on any regular job?

How is a day of a smart contract auditor working day like since he starts until he finishes?

Does his boss request to work on a specific protocol during that day or during a whole week and to send an audit report at the end of the day or week? and like this every week but with different code snippets or entire protocols?

Many thanks

Smart Contract Auditor

智能合约审计师

Hi everyone,

I’m thrilled to share that I’m a new learner who has just completed a Solidity 101 course. The journey so far has been incredibly exciting and insightful. I’m eager to continue exploring and deepening my knowledge in Solidity and blockchain development. Looking forward to engaging with this amazing community and learning together!

I’m curious to know what resources have helped others at my level improve. Any recommendations on websites, courses, tools, or any other materials would be greatly appreciated.

Cheers,
Philip

Excited to Continue Learning Solidity!

Hello everyone , I've noticed that the offer function uses the .call{value: amount}("") method to send Ether to the recipient's address.

Could anyone provide insight into whether this function is indeed vulnerable to reentrancy and suggest any best practices or modifications to mitigate such risks?

```solidity 
function _offer(address to, uint256 amount) internal {

      balance -= amount;

      (bool success, ) = to.call{value: amount}("");
      if (!success) {
          revert TransferFailed(address(0), address(this), to, amount);
      }
  }
```

Reentrancy Vulnerability

Test Question for Cyfrin Updraft

I'm getting this error when clicking on the getBalance button of the live page of port 5500 for my anvil:

"BlockOutOfRangeError: block height is 150 but requested was 12092"

![](https://example.com/your-image.png)![](https://ipfs-cdn.peeranha.io/QmT9GJ949XC34CUGzCLAL2QyZoSXABMesC2rELvxrBZx6r)

Can anyone help explain what I missed here? Thank you!

BlockOutOfRangeError

在使用 “forge init” 命令安装后尝试设置我的铸造厂时，我遇到了这个错误：

错误：提交失败 (code=some (128)、stdout= "”、stderr= "作者身份未知\n\n*** 请告诉我你是谁. \n\n 运行\n git config--global user.email\” you@example.com\”\n git config--global user.name\ “你的名字\”\n\n 来设置账户的默认身份. \n 省略--global 以仅在此存储库中设置身份. \n\n 致命：无法自动检测电子邮件地址（收到 “用户 @MACs-MBP”. （无）')”)

尽管我能够获得除了 “lib” 和 “.gitmodules” 之外的所有我需要的文件夹，但希望将来这不会影响我. 而且我还试着用 “forge init--force” 还是一样

Setting Foundry

设置铸造厂

AI 问道，为什么我在尝试在 VS 代码中部署我的代码时一直遇到这个错误，但还是一样. 这是错误：
[] 正在编译...
[] 使用 Solc 0.8.18 编译 14 个文件
[] Solc 0.8.18 在 149.20 毫秒内完成
错误：编译器运行失败：
错误 (2314)：预期为 ';' 但得到了标识符
 --> 脚本/deploySimpleStorage.sol: 11:9：
 |
11 | vm.stopBroadcast ();
 | ^^



这是我的代码. solidity
“'
//SPDX 许可证标识符：麻省理工学院

pragma solidity ^0.8.18;
从 “forge-std/Script.sol” 导入 {脚本}；
从 “...” 导入 {simpleStorage}/src/SimpleStorage.sol “;

合约部署简单存储是脚本 {
 函数 run () 外部返回 (simpleStorage) {
 vm.startBroadcast ();
 SimpleStorage SimpleStorage = new SimpleStorage (
 vm.stopbroadcast ();
 返回 SimpleStorage；
 }
}
“'

Setting up SimpleStorage Deployer

设置 SimpleStorage 部署器

看来安装了 zksync foundry 的，已经不在 github 存储库里了，我试着在终端中键入命令行 “权限被拒绝，无法从远程存储库读取”

Zksync Foundry Install

zksync 铸造厂安装

![](https://ipfs-cdn.peeranha.io/QmXVPMEEKxAfiNHbrUbByDq5T8PV2j1Xg6qNENw1b5fpVG)
**了解以太坊智能合约中的主题：事件日志及其重要性**

在以太坊智能合约的世界中，**主题**在事件日志中起着关键作用，可帮助开发人员和应用程序有效地识别和过滤特定事件. 这些机制是去中心化应用程序（DApps）功能不可或缺的一部分. 它们促进了与以太坊区块链的无缝互动. 让我们更深入地研究主题的概念及其意义. 

### 以太坊智能合约中的主题是什么？

在以太坊中，智能合约可以发出事件以表示合约中发生了感兴趣的事情. 这些事件记录在区块链上，并在这些事件日志中使用主题对记录的数据进行分类和筛选. 主题本质上是索引字段，可以更轻松地查找和分析特定事件. 

### 主题及其用途细分

**1. 事件识别**
第一个主题通常被称为**Topic0**，是事件签名的**Keccak256哈希值**. 该签名包括事件的名称及其输入参数的类型. 通过使用此哈希，以太坊网络可以将一个事件与另一个事件区分开，从而确保每个事件都是唯一可识别的. 这对于准确的事件跟踪和记录至关重要. 

**2. 索引参数**
在智能合约中定义事件时，开发人员可以将某些参数标记为**已索引**. 这些索引参数成为其他主题（例如 Topic1、Topic2 等）. 索引参数允许高效搜索和筛选事件. 例如，在代币转移事件中，对发件人和收件人地址进行索引可以快速识别涉及特定地址的所有交易. 

**3. 数据存储**
未标记为索引的参数存储在事件日志的**数据部分**中. 与索引参数不同，这些数据值不能作为主题进行搜索，但包含事件参数的实际值. 这种分离可确保仅对最相关和最常搜索的数据进行索引，从而优化存储和检索. 

**4. 高效过滤**
主题的主要优势之一是能够**筛选和监听特定事件**. 外部应用程序，例如钱包或 dApp，可以订阅事件并使用主题来筛选他们感兴趣的事件. 例如，去中心化交易所（DEX）可以监听与代币交换相关的事件，而忽略其他无关的事件. 这种有针对性的筛选增强了性能并减少了需要处理的数据量. 

### 话题在以太坊中的实际应用

事件日志中主题的使用有许多实际应用，使开发人���和用户更容易与以太坊区块链进行交互. 以下是一些示例：

-**代币转移**：通过索引代币转账事件中的发送者和收件人地址，钱包可以快速向用户显示交易历史记录. 
-**去中心化交易所**：DEX平台可以筛选事件以跟踪特定的交易对，从而确保交易的有效匹配和执行. 
-**治理和投票**：在去中心化自治组织 (DAO) 中，主题可用于监控和验证投票结果和提案. 

### 结论

总而言之，以太坊智能合约日志中的主题对于有效识别、筛选和处理事件至关重要. 它们可以快速检索和分析区块链数据，使应用程序更容易与以太坊网络进行交互. 通过利用主题的力量，开发人员可以创建响应更快、更高效、更友好的去中心化应用程序. 

Topics in Ethereum smart contracts

以太坊智能合约中的话题

我的代码可能出什么问题？
```
 function testFundUpdatesFundedDataStructure() public {
        fundMe.fund{value: 10e18}();
        
        uint256 amountFunded = fundMe.getAddressToAmountFunded(address(this));
        assertEq(amountFunded, 10e18);
    }```

出现这个错误：

 [14658] FundMeTest:: testfundUpdatesFundedDatesFundedDatesFundedD
 ├─ [2658] FundMe:: fund {价值:100000000000000000} ()
 │ ├─ [0] 0x000000000000000000000000000000000000000000:: latestRoundData () [静态调用]
 │ │ └─ ← [停止] 
 │ └─ ← [还原] evmError：还原
 └─ ← [还原] evmError：还原

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