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39- 专家问答
May 24, 2025使用区块链确保项目安全
大家好，我最近开始在一家初创公司实习，担任区块链开发人员，负责该项目的安全部分，现在我正在学习cyfrin智能合约安全和审计课程，我需要你的建议来提供我们正在云端部署的安全性以及如何提供安全性.
- Smart Contract
- Solidity
01 - 专家问答Mar 29, 2025
How to generate random Number between 1&2 without VRF?
So I was making a coinflip game which assigns head- 1 and tails -2 and when user places bet on polygon chain.... smart contract generates a random number between 1 and 2 and if the outcome is same...user gets double - (5 % as fee to the owner of contract) ! from a pool and if outcome is different then user loses all and the lost amount is deposited in the pool - (3% as fee to the owner) (to fund winners)... but any way to make genrate a random number? I have no funds at all so I can't afford chainlink VRF to generate. So is there any other secure way for this? plus I am pritty new to solidity so I made this code with help of chat gpt but I don't it works....can anyone help to make the code better? code- // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; contract CoinFlip { address public owner; uint256 public contractBalance; event BetPlaced(address indexed player, uint256 amount, bool choice); event BetResult(address indexed player, uint256 amount, bool won); constructor() { owner = msg.sender; } function placeBet(bool choice) external payable { require(msg.value > 0, "Bet amount must be greater than 0"); bool outcome = (block.timestamp % 2 == 0); // Simple pseudo-random outcome if (outcome == choice) { uint256 winAmount = (msg.value * 2 * 95) / 100; require(address(this).balance >= winAmount, "Insufficient contract balance"); payable(msg.sender).transfer(winAmount); emit BetResult(msg.sender, winAmount, true); } else { uint256 lostAmount = (msg.value * 97) / 100; contractBalance += lostAmount; emit BetResult(msg.sender, msg.value, false); } emit BetPlaced(msg.sender, msg.value, choice); } function depositFunds() external payable { require(msg.sender == owner, "Only owner can deposit funds"); contractBalance += msg.value; } function withdrawFunds(uint256 amount) external { require(msg.sender == owner, "Only owner can withdraw funds"); require(amount <= address(this).balance, "Insufficient contract balance"); payable(owner).transfer(amount); contractBalance -= amount; } } `
- Smart Contract
- Solidity
01 - 讨论Feb 24, 2025
大家好，我是新来的. 我希望有人能给我链接来有效地学习 solidity.
//SDPX 许可证标识符：MIT pragma solidity 0.8.24； 合同《你好世界》 { 字符串公开 Hello World； } //只需要在这里添加一些东西
- Smart Contract
- Solidity
03 - 讨论Dec 09, 2024
Solidity 初学者
在上了 cyfrin updraft 的初学者课程之后，我正在尝试建造一些东西，这样我就可以巩固知识了，但好像我什么都不知道. 真的让我难过. 你们会给什么建议
- Smart Contract
- Solidity
23最佳答案 - 讨论Sep 13, 2024
为初学者 Solidity 开发人员寻求自由职业机会”
我已经学习 Solidity 几个星期了，以前没有 IT 背景. 我是否有机会获得自由职业或用我目前的技能赚钱？
- Solidity
- Use cases
00 - 讨论Jul 24, 2024
格式化/你好
我是 Solidity 的新手！我想向这个很棒的社区打个招呼，希望它能让我摆脱困境，希望结识新朋友. 我的编程经验为零，但喜欢加密. 在这些论坛上发布问题时，我应该以某种格式发布问题，和/或在这些论坛中我应该遵循什么不太明显的规则？ 感谢您抽出时间阅读并留下回复！
- Smart Contract
- Solidity
- Use cases
01 - 讨论Jul 13, 2024
WEB3 审计的职业道路：首先是项目建设还是学习审计？
大家好， 我最近用 Cyfrin Updraft 完成了 Solidity 和 Foundry 的基础和高级课程. 我正在考虑下一步行动，并考虑在 Solidity 工作. 我应该在这个阶段开始学习智能合约审计，还是先创建一些项目来巩固我目前的知识会更有益？ 期待你的建议！
- Smart Contract
- Solidity
01 - 专家问答Jun 04, 2024
solidity 语法多久更改一次
我想知道 solidity 语法规则多久更改一次，以及跟进最新更新的最佳时事通讯
- Smart Contract
- Solidity
- Language Grammar
- Solidity Compiler
11 - 讨论May 31, 2024
重入漏洞
大家好，我注意到优惠函数使用.call {value: amount} (“”) 方法将以太币发送到收件人的地址. 谁能深入了解该功能是否确实容易受到重入的影响，并提出任何最佳做法或修改以降低此类风险吗？ 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); } } `
- Smart Contract
- Solidity
- Solidity Compiler
01
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).
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