Even the official site may trigger malicious authorizations: the $3 million incident made me rethink GRVT SecureKey
On June 25, Polymarketโs official team confirmed that a third-party front-end vendor was compromised, and malicious scripts were injected into the real front end accessed by some users. PeckShieldโs on-chain investigation cited that about $3 million worth of PUSD was stolen, then bridged from Polygon to Ethereum and exchanged for roughly 1,893 ETH. Polymarket said it has removed the affected dependencies, contacted the relevant users, and provided full compensation.
The most counterintuitive part is this: even if the domain is correct, HTTPS is functioning properly, and you can log into your accountโnone of that alone proves that the contents youโre about to sign match your actual intent.
Thatโs exactly why I re-examined the
@grvt_io SecureKey design. According to the GRVT help center, account permissions are split into two layers: email/password or Google/Microsoft OAuth (Web2 credentials) are used to view assets, positions, and participate in non-trading features; any action that could change the ownership of assets requires a Web3 SecureKey signature.
SecureKey is essentially an Ethereum public/private key pair. Users can choose an external wallet, or use an email OTPๆนๆก supported by Privy.
The purpose of this layered approach is that even if Web2 login credentials leak, an attacker still canโtโbased solely on an authenticated login stateโcomplete the asset changes that require SecureKey authorization.
If a device is controlled by malware, an external wallet extension is replaced, or a user approves tampered content on a real website, even a cryptographically valid signature may still convey the wrong intent. What self-custody reduces is the platformโs unilateral custody risk of moving assets, but it does not automatically eliminate phishing, dependency-component risks, smart-contract risks, or personal-operation risks.
After this incident, I added five verification checks to every one of my signatures:
1. Enter via bookmarks or official entry pointsโdonโt rely on search ads or DM links;
2. Determine whether the request is actually a login proof, a place order, a token authorization, a transfer, or a withdrawal;
3. Verify the assets, amounts, destination address, contract, and the scope of the authorization;
4. If the page and the wallet display donโt match, or if it suddenly requests unlimited authorization, cancel immediately;
5. For large-amount accounts, use dedicated signing devices whenever possibleโdonโt mix the everyday download environment with high-value keys.
#grvt #SelfCustody #WalletSecurity #Web3Security