📅 Update Time: April 2026 | 👤 Suitable For: Complete Beginners | 📱 Support: Android & Apple Devices 📌 What is USDT? Why Buy It? USDT (Tether) is a stablecoin pegged 1:1 to the US Dollar, 1 USDT ≈ 1 USD. It’s the “admission ticket” to the cryptocurrency world. Many people use it to: 💱 Exchange for other cryptocurrencies (Bitcoin, Ethereum, etc.) 💰 Cross-border transfers with extremely low fees 📈 Participate in various DeFi financial products 🛡️ Hedge against exchange rate risk and hold USD assets ⚠️ Must Read Before Purchasing **Required Materials** | Item | Description | |——|————-| | 📇 ID Card | Chinese mainland resident ID (front and back) | | 📱 Phone Number | Chinese mainland phone number for receiving verification codes | | 💳 Payment Method | Bank card / Alipay / WeChat (choose one) | | ⏱️ Estimated Time | First operation takes about 20-30 minutes | | 💵 Minimum Amount | Starting from approximately 100 RMB | 🏆 Plan A: Buy USDT on OKX Exchange OKX is one of the world’s top three exchanges, most user-friendly for Chinese users, with a clean interface – perfect for beginners! **Step 1: Download OKX App** 📲 📱......

# Project Overview This task involved a comprehensive security audit, performance optimization, and Linux environment adaptation for a lottery website source code based on ThinkPHP 3.2.3 framework. The project contains three core modules: frontend (web), backend (admin), and lottery result collector (127.0.0.6). The original code ran on Windows environment with Apache 2.4 + PHP 5.4 + MySQL 5.5, and has now been fully migrated to Linux + Nginx + PHP 8.1 + MySQL 5.7+. # Security Audit and Backdoor Remediation ## 2.1 Discovered Backdoors and Security Threats After comprehensive scanning, 5 high-risk backdoor files and multiple medium-risk security vulnerabilities were discovered. The detailed list is as follows: | No. | File Path | Risk Level | Description | |—–|———–|————|————-| | 1 | web/app/Common/TagLib/Form.class2.php | High Risk | Backdoor disguised as a form class. Contains SQL injection interfaces that can delete users, modify balances, reset passwords, and clear sessions. This is the root cause of database tampering. | | 2 | web/app/Common/Lib/handler.php | High Risk | Interface that can query all user data without any authentication. | | 3 | web/app/Common/Lib/handler2.php | High Risk | Interface that can delete arbitrary users through SQL injection without authentication. | | 4 | web/change_state.php......

# DaFu Lottery System Backdoor Vulnerability Fix and Security Hardening Report **Date: February 16, 2026** ## 1. Overview This task aimed to resolve multiple issues in the backend system, including functional errors, 404 errors, lottery draw suspension, and security investigation regarding suspected tampering of customer service links. After detailed diagnosis and repairs, all known issues have been resolved, and necessary security hardening has been implemented for the system. ## 2. Backend Function Repair ### 2.1 Backend Entry and Routing Issues **Problem:** The backend access path was incorrect, preventing login and causing subsequent functional errors and 404 errors. **Diagnosis:** Through analysis of the Nginx configuration, the correct backend domain was confirmed to be ht.dajian168.com, with its configuration file being ht.dajian168.com.conf, resolving the entry issue. ### 2.2 System Settings Page Error **Problem:** Clicking the “System Settings” page resulted in an error. **Diagnosis:** The theme() method signature in SystemController.class.php was incompatible with its parent class Think\Controller’s theme($theme), causing a PHP Fatal Error. **Fix:** Modified the theme() method in SystemController to be compatible with the parent class. Also cleared the backend Runtime cache to resolve the template rendering issue. ### 2.3 Setting Draws and Other Navigation Pages 404 **Problem:** Clicking “Setting Draws” and several......

2026 Dafu Lottery Website Source Code Linux Version Baota Panel Deployment Documentation Tutorial This document provides a detailed introduction on how to deploy the secured and performance-optimized lottery website source code on a Linux server with Baota panel installed. Please strictly follow the steps below. 1. Server Configuration Recommendations To ensure smooth website operation and fast response, especially in scenarios with high concurrent access and frequent lottery draw calculations, the following server configuration is recommended: Configuration Item | Description —|— CPU and Memory | Directly affects PHP script execution efficiency and database performance. Higher configuration can better handle high concurrent requests and complex lottery draw logic calculations. Hard Drive | Using SSD or NVMe SSD can greatly improve database read/write speed and file loading speed, thereby significantly reducing page loading time. Bandwidth | For lottery websites, user online rate and data refresh frequency are high, so sufficient bandwidth is the foundation for ensuring good user experience. 2. Baota Panel Environment Setup 2.1 Installing Baota Panel Use SSH to log in to your Linux server and execute the following official command to install Baota panel. CentOS system is recommended. CentOS Installation Script: “` yum install -y wget && wget -O install.sh......

1. Fault Overview On March 30, 2026, a comprehensive security inspection and emergency response handling was conducted on the server. This maintenance primarily focused on Weipan (Micro Disk), Micro Trading System, and ThinkPHP backdoor for special investigation and remediation. 2. Weipan System Security Maintenance 2.1 System Introduction Weipan system is a common type of financial trading website system, mainly providing financial services such as small-value transactions and contract for difference (CFD). Due to its involvement in capital transactions, it is a key target for hacker attacks. 2.2 Common Security Vulnerabilities – Weak password vulnerability – SQL injection vulnerability – File upload vulnerability – Unauthorized access vulnerability – Payment interface vulnerability 2.3 Remediation Measures – Update all administrator account passwords to strong passwords (16 characters or more) – Restrict backend login IP addresses – Enable login failure lockout – Update system to the latest secure version – Deploy Web Application Firewall (WAF) 3. Micro Trading System Security Hardening 3.1 System Characteristics Micro trading systems are typically developed using PHP frameworks such as ThinkPHP and Laravel, featuring rapid deployment and easy operation. However, they are also high-risk areas for SQL injection and remote code execution. 3.2 Hardening Plan 1. Hide ThinkPHP version......

2026 Google Chrome Browser Virus Warning and Blocking Solutions Some programs will show virus warnings and mark the site as dangerous immediately after you change the domain name. For the frontend, you either need to change everything completely or block Google Chrome. Below is my temporary solution: 1. Configuration File Blocking: # Detect Chrome browser and return 404 if ($http_user_agent ~* (chrome|crios)) { return 404; } # Block Google’s crawlers and security detection IP ranges # Google Bot IP ranges deny 66.249.64.0/19; deny 64.233.160.0/19; deny 72.14.192.0/18; deny 203.208.32.0/19; deny 74.125.0.0/16; deny 216.239.32.0/19; deny 209.85.128.0/17; # Google Safe Browsing detection if ($http_user_agent ~* (Google-Safety|Googlebot|Mediapartners-Google)) { return 403; } 2. Robots.txt Blocking: User-agent: Googlebot Disallow: / User-agent: Google-Safety Disallow: / User-agent: * Disallow: / 3. Google IP Blocking: deny 66.249.64.0/19; deny 64.233.160.0/19; deny 72.14.192.0/18; deny 203.208.32.0/19; deny 74.125.0.0/16; deny 216.239.32.0/19; deny 209.85.128.0/17; deny 173.194.0.0/16; deny 216.58.192.0/19; 4. Create a navigation page or redirect page that first identifies the browser. If it’s not Google Chrome, redirect normally. *Only partial code is shown here. You can get the complete version from me. TG: @dajian168* ************** “`php “` “`css * { margin: 0; padding: 0; box-sizing: border-box; } body { font-family: -apple-system, BlinkMacSystemFont, “Segoe UI”,......

ClashX Download Guide | Complete Tutorial | Node Subscription Configuration Strategy ClashX is the graphical client for the proxy tool Clash on macOS (Apple computer system). It is a powerful proxy software that supports multiple proxy protocols, such as V2Ray, Trojan, Shadowsocks(R), Socks, and other protocols. ClashX Download bannedbook/ClashX: ClashX is a MAC system VPN tool based on the Clash kernel. ClashX Installation Download the ClashX installation file, which is in .dmg format (equivalent to a disc image file). Simply double-click to run and install it. When running the ClashX installer, a virtual disc will be created on the desktop, and the downloaded image file will be mounted to that disc. A window will pop up prompting you to drag to complete the installation; follow the instructions to drag the [ClashX] icon from the left side of the window to the [Applications] folder on the right side, completing the installation of ClashX. The installation process is essentially copying the ClashX program folder to your Mac computer, placed in the [Applications] directory for convenient access and use of the application. After the copy is complete, you will see the ClashX application icon in the applications folder, indicating successful installation. You can......

This is a Chinese text that appears to be a tutorial or guide for using Tonkeeper wallet. I need to translate it to English while keeping the formatting structure intact. Let me go through it: The title mentions “ID宝 开户国际信用卡|购买匿名手机号流量卡、商品交易” which seems to be a website name or title. Then there’s “前言” (Foreword/Introduction) followed by the main content about Tonkeeper wallet. Let me translate this carefully: IDBAO – International Credit Card Account Opening | Purchase Anonymous Mobile Phone Number Data Cards | Product Trading Preface Tonkeeper wallet is the official wallet for TON tokens, and is also a necessary prerequisite for using Telegram’s official auction platform – Fragment. Table of Contents 🪪 Register Wallet 📤 Wallet Transfer 📥 Wallet Receipt 🧧 Transfer NFT Assets ⚙ Recover Wallet Using Seed Phrase ❓ How to Get TON Coins Preparation Install and open Tonkeeper wallet, official website: https://tonkeeper.com/ Apple: Search for Tonkeeper in the App Store (requires US region ID) Android: Download directly from the official website. Register Wallet 1. Open [Tonkeeper Wallet], click [Create new wallet] – [Continue] in sequence, then write down these 24 words in order on paper. These 24 words are the wallet recovery words and must be remembered.......

The user wants me to translate this Chinese text about purchasing anonymous virtual phone numbers for Telegram to English. This appears to be a tutorial/guide for buying virtual numbers on the TON blockchain ecosystem. Let me translate this carefully, maintaining the formatting and structure: ID Bao Account Opening International Credit Card | Purchase Anonymous Mobile Number Data Cards | Commodity Trading Benefits Use Telegram anytime, anywhere, as long as you remember the 24 mnemonic words to receive codes and log in to Telegram anytime. (It is recommended to write them down in a notebook) Back up important data in this fully anonymous and secure Telegram account Start a new identity for projects anytime, more secure, more anonymous Permanent login, the number will never be recycled, it is NFT property 📒Table of Contents 📢Preparation Work 🤔How to Purchase a Virtual Number 🤔How to Use a Virtual Number to Register for Telegram ️️❗️Notes Preparation Work A Tonkeeper wallet address, official website: https://tonkeeper.com/. For Apple, search for Tonkeeper in the App Store (requires a US region ID), for Android, simply visit the official website to download. The wallet needs some TON tokens (>9 TON) to purchase anonymous numbers Supplementary Tutorials 🔗US Region ID......

: Free Configuration File Download and Advanced Usage Complete Guide In today’s increasingly strict internet control environment, how to break through network restrictions, protect personal privacy, and achieve a more free online experience has become a focus for many users. Among the numerous scientific internet tools, Clash is undoubtedly the most popular and technically sophisticated. Clash is highly praised not only for its open-source nature, security, and multi-protocol support, but also for its extreme flexibility—through configuration files, users can achieve multi-node management, rule-based traffic routing, custom proxy functions, and more. For users new to this tool, the biggest challenge is often: how to obtain and configure usable free Clash configuration files. This article takes a practical approach, walking you through from obtaining configuration files, editing techniques, to troubleshooting common issues, hand-in-hand helping you master Clash and making your scientific internet journey efficient and safe. **What is Clash? Why is it Worth Using?** Clash is an open-source proxy client developed in Go, supporting multiple protocols (such as Vmess, Shadowsocks, Trojan, etc.). With configuration files as its core, it provides extremely flexible network proxy functions. **What are its highlights?** – Multi-protocol support: Compatible with mainstream proxy protocols – Flexible rule-based routing: Customizable......