Recently, there have been numerous security alerts regarding USDD. After carefully analyzing data on phishing incidents in 2025 and malicious domain registrations, a clear trend has emerged—the disguise techniques used by phishing sites are becoming increasingly sophisticated, with more targeted approaches.

These attacks mainly have a few characteristics: First, they utilize AI technology to generate highly realistic pages that can almost fool most people; second, they employ new bait methods such as social media airdrops and governance voting to precisely target victims; third, they evolve from simple, crude setups to covert, diverse attack patterns.

Based on these phenomena, I have summarized a "Multi-Level Phishing Detection Framework," which essentially provides multiple layers of "insurance" for assets. This framework combines traditional cybersecurity defense concepts with adjustments specifically for Web3 and blockchain, taking into account the unique interaction logic of DApps and on-chain asset transfers.

**The four core levels of the framework are as follows:**

**Level 1: Domain and Certificate** (Technical Foundation)
This is the most straightforward line of defense. Focus on three aspects: whether the domain name has subtle differences (such as confusing letters or an extra character), whether the official domain and mainstream DApp domains are being impersonated, and whether malicious sites are abusing subdomains. This layer is crucial because most people still access phishing sites through URLs.

**Level 2: Content and Interaction Logic** (Content Dimension)
Some phishing pages are extremely realistic. You need to observe whether the interaction flow on the page is abnormal. For example, check if the normal transfer process aligns with the website’s flow, whether button arrangements match the official style, and if there are language errors or strange phrasing in prompts.

**Level 3: Behavioral Pattern Recognition** (User Behavior)
Pay attention to suspicious requests. If a site asks you to import your private key or seed phrase, or to authorize contract permissions without clearly stating the purpose, or claims to allow one-click governance token claims, these are high-risk signals. Normal DApp interactions are unlikely to be so reckless.

**Level 4: On-Chain Verification** (Blockchain Layer)
The final line of defense is on-chain verification. Before sending a transaction, confirm whether the recipient address truly belongs to the official or trusted counterpart. Use a block explorer to review historical transaction records and assess the address’s reputation and activity patterns.

The advantage of this framework is that it enables users to build a comprehensive defense system—from entry point protection, content recognition, behavior judgment, to final on-chain validation. It’s not reliant on a single security tool but enhances asset security awareness through multi-dimensional observation.

It is recommended that everyone perform these four checks before engaging in any USDD-related interactions. Especially when encountering tempting airdrops, voting, or high-yield promises, exercise caution. AI-generated pages can indeed deceive, but as long as you develop the habit of checking layer by layer, the chances of being phished will be greatly reduced.