Web3 Wallet Security Protection: How Beginners Can Avoid Being Scammed by "Mnemonic Phrase" Fraudsters
In the Web3 world, your wallet is your bank vault. Before entering Web3 investments, you need to master some important security tips.

Once the mnemonic phrase is leaked, it’s equivalent to handing over the vault key along with the password to a thief, and this is a vault that "cannot call the police or recover." In 2025, scammers have already perfected the art of "phishing for mnemonic phrases."

The following protection guide combines the most common recent real cases and official security advice to help you keep your wallet secure.

1. Ironclad Rules to Always Remember

1. Anyone asking for your 12/15/18/21/24 mnemonic phrases is 100% a scammer.

2. Official entities will never proactively message you to ask for your mnemonic phrases.

3. Official customer service, project teams, airdrop bots, NFT minting pages, technical support… none of them will ask for your mnemonic phrases.

4. Even if the other party sends you an "official ticket," shows "administrator status," or can accurately state the first six and last four of your wallet, don’t believe it!

5. Even if the other party already knows you have 100 ETH and 3 BAYC in your wallet, don’t believe it! (They can see on-chain data)

2. Common Types of Scams

Case 1: Scamming for Deposit + Mnemonic Phrase Under the Guise of a Part-Time Job

Trick:
"College students working part-time from home, earning 500+ a day" → "First, deposit a fee" → "Fill out the information to bind your wallet" → Inducing you to manually input the mnemonic phrase to "recover your wallet."

Case 2: Induction by Fake Trading Platforms

Trick:
Inducing you to download "high-yield USDT earning platforms" from fake Facebook, YouTube, QQ groups, etc. → Making you create/import a wallet → Directly inputting the mnemonic phrase → Assets disappear in seconds.

Case 3: High Return Project Scam (Most Common)

Trick:
"Tibet University Financial Investment Course" → "Mentor helps you earn 500%" → "Internal indicators, internal quotas" → Add the private mentor on WeChat → Ask you to transfer to a certain "safe wallet" → Request the mnemonic phrase to "help you manage" or "help you operate."

3. Real Protection Measures (Please Check Immediately)

1. Properly Store Your Mnemonic Phrase

• Write it down on paper or metal plates, and store it in a safe, offline place.
• Split it into 2-3 parts and store them in different locations; never take photos, screenshots, or store it in cloud drives/chat records.
• Never input the full mnemonic phrase on connected devices (unless you are importing a new wallet and ensure the device is clean).

1. Use Physical Media for Backup (Highly Recommended)

• It is recommended to use cryptocurrency-specific metal backup plates (such as Billfodl, Cryptosteel, SeedPlate, etc.).
• Fireproof, waterproof, and loss-proof, a hundred times more reliable than paper.

1. Verify the Accuracy of Your Backup (Many Fail Here)

• After creating the wallet, immediately re-import using the backup to confirm complete consistency.
• This step is often overlooked but can prevent you from writing a wrong word during backup, leading to future losses.

1. Properly Protect Your Mnemonic Phrase (Additional Tips)

• Never reveal all 12/15/18/21/24 words to anyone at once.
• Even if the other party says, "I just need to see the first 6 to confirm," it’s still not okay.
• Use fake mnemonic phrases as bait: prepare a fake wallet (with 5 bucks inside), remember its mnemonic phrase, and when someone asks for it, throw it at them and see them take the 5 bucks before blocking and reporting them.

1. Hardware Wallets are the Ultimate Solution (Essential if Possible)

• Ledger, Trezor, OneKey, Keystone, etc.
• The mnemonic phrase never leaves the device, even if the computer is infected, it cannot be stolen.
• If you don’t want to buy a hardware wallet right now, you can first choose a reputable, fully functional software wallet from a big brand as a transition. For example, the OKX Web3 wallet comes with "Mnemonic Phrase Hidden Input Method" and "Fake Mnemonic Phrase Trap" features, which will directly pop up a red warning box if you input incorrectly or land on a phishing site, helping ordinary users avoid many pitfalls.

Download link for OKX wallet:

https://static.rmgvx.com/upgradeapp/okx-android_aicoin20.apk

4. What to Do If It Has Already Leaked? (Golden 30 Minutes)

1. Immediately transfer all assets to a new, secure wallet (prepare a new wallet in advance).
2. Use high Gas for the transfer to prioritize it.
3. Destroy the old wallet immediately after the transfer.
4. Don’t hold onto the hope that "maybe they won’t transfer it away," scammers transfer funds 100 times faster than you.

5. In Conclusion

In Web3, 99% of theft occurs because individuals have handed over their mnemonic phrases.
No hacker has breached your wallet; you have handed your wallet over to the hacker yourself.

Keep this phrase etched in your mind:
"As long as I don’t say the mnemonic phrase, I am invincible."

By safeguarding these 12/24 words, you are safeguarding your entire Web3 wealth.

6. How to Have an OKX Wallet to Master On-Chain Security and Enjoy Long-Term Trading Fee Discounts?

Method 1: AiCoin provides a binding OKX DEX web version invitation code (AICOIN88) exclusive offer for low-cost participation in on-chain trading.

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The operation is very simple:

Click the exclusive link below (the invitation code has been automatically filled for you):
https://web3.okx.com/ul/joindex?ref=AICOIN88
In the wallet creation/import process, confirm that the invitation code AICOIN88 is bound.
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Method 2: OKX App download link:

https://static.rmgvx.com/upgradeapp/okx-android_aicoin20.apk

How to bind the invitation code in the App (AICOIN88):

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