You click, you sign, you confirm... and there, it’s over. You may have just given full control to a smart contract or a disguised scam.

💡 In Web3, what you sign is worth as much as a paper contract.

Here are the 10 most dangerous commands or approvals that you should NEVER blindly validate, even on Metamask, TrustWallet or others.


1️⃣ setApprovalForAll (NFTs & tokens)

📛 Gives full access to ALL your NFTs or tokens to an address... often used by scams.

❌ To be refused unless you understand exactly why you are signing it (e.g., temporarily for OpenSea, but revoke afterwards).




2️⃣ approve(spender, amount)


🔐 Allows a third party address to withdraw your tokens at any time, up to the set limit.

Even a DEX like Uniswap can abuse this if you approve an “infinite amount”.

✅ Always use a custom amount if possible, and revoke afterwards with Revoke.cash



3️⃣ transferFrom(address from, address to, uint amount)

🚨 Often used chained after an approve, it allows to automatically drain your wallet via another contract.



4️⃣ delegate(address delegatee)


🗳️ Used in governance... but some scams use it to hijack your voting power, even to control related vaults.



5️⃣ permit(...)

✅ Very useful for signing a “fee-less” transaction (EIP-2612), but can be abused if misused.

⚠️ If a scam makes you sign a permit, it can then chain a transfer.


6️⃣ increaseAllowance(...)


💸 Makes you believe you are adding a limit... but you still give even more withdrawal power to the target address.

💀 Some scams make you sign this just after an airdrop.



7️⃣ fallback() payable or empty transactions


🕳️ You see nothing in the signature... but it still sends ETH or BNB to a trapped contract.

Refuse any signature without a clear explanation in your wallet.




8️⃣ Signature of a trapped off-chain message

📝 Some attacks rely on a message signature (not a transaction) to use it later on a fraudulent contract.


Example:

kotlinCopierModifierSign this message to confirm ownership of your wallet:
0x123abc...

⚠️ If you see this outside of a trusted site → run away.



9️⃣ Transactions initiated “outside a dApp”

🧨 If your wallet shows a signature or approval when you haven't requested anything in a DApp or site, it’s probably:

  • A malicious extension

  • A trapped tab opened

  • A redirection attack




    🔟 Signature in an unknown pop-up


    💬 Common example: a pop-up “Binance Update” asks you for a signature in Metamask...


    Spoiler: Binance never needs you to manually sign a file.never needs you to manually sign a file.





    🛡️ CONCLUSION: if you don't understand a command → you do not sign.


    Before confirming anything:

    • Check the URL (always HTTPS)

    • Check that the command matches what you requested

    • Use https://revoke.cash or https://etherscan.io/tokenapprovalchecker to revoke access

💬 Do you want a simple PDF guide with these commands + their translations for Metamask / TrustWallet?

Comment “WALLET SAFE” and I’ll send you that 🔐



#CryptoSecurity #Wallet #Web3Security #BinanceFeed #Binance