After a friend lost 4000 U in 3 seconds, I decided to share all my Web3 security experience
1. Wallet and Device Management
Mobile phones must have fingerprint + boot password set, and the wallet app itself should also have a lock.
Use dedicated devices: one phone only for trading apps, no entertainment/social apps installed, disconnect from the internet daily, and turn off after trading.
Xiaomi users are recommended to use the 'Xiaomi Dual System' to isolate the cryptocurrency environment.
Trading phones should not enable hotspots, should not connect to unfamiliar WiFi, and the phone storing wallet private keys should never go online.
2. Authorization Risk is the Biggest Killer
Do not casually click on airdrops, airdrop websites, or free NFT links.
Be sure to revoke permissions promptly after authorizing, especially 'unlimited authorization', which can easily lead to asset theft by malicious contracts.
Use Token Allowance Checker or TokenTool to regularly clear authorizations.
When the authorization limit is shown in red, stop operations immediately!
3. Wallet Structure and Operation Strategy
Trading wallet ≠ storage wallet, use them separately. Immediately transfer coins to a cold wallet after completing a trade.
Do not keep BNB/ETH and other fee tokens in the wallet for long, withdraw them to minimize the chance of being 'cut down' by others.
Use a multi-signature wallet for important assets, combine it with a sentinel wallet + alarm mechanism, and push notifications for any anomalies immediately.
4. Project Selection and Coin Screening
Do not engage with projects that do not have a public team, community group, or audit.
Some coins may 'automatically transfer and destroy' or 'die upon withdrawal'; test with a small amount before deciding to buy.
Do not try to bottom fish during a crash or with coins that are about to be delisted; once delisted, they have zero value.
5. Chain and Security Recommendations
The SOL chain is relatively secure, while EVM chains are frequently attacked, especially the BNB chain with many fake tokens.
Recommended chains to use are Solana > ETH > BSC; be sure to use a hardware wallet or multi-signature for asset isolation.
6. Permission and System-Level Prevention
Prohibit all apps from reading permissions like 'clipboard', 'photo album', 'files', etc., to prevent private keys from being exposed.
For wallets involving large amounts, it is recommended to set up system-level monitoring alarms (such as scripts + email + mobile notifications).
In summary:
Web3 wallets are not just apps, they are your 'vault'—even if you operate well, a single authorization or link can lead to losing all your assets.
Safety comes first, making money second. Developing these security practices into habits is far more valuable than executing a few more trades.
