1. A Nightmare Without a Sound
Over the past year, we’ve seen far too many users lose their entire portfolios in an instant — without warning.
What’s more shocking?
The attacker didn’t even need them to send any tokens.
All it took was one signature — a transaction carrying Hex Data.
It might’ve looked like a simple action: claiming an NFT, joining an airdrop, connecting a DApp, or signing into a site.
Seemingly harmless:
0 ETH, sent to a smart contract address.
But the real threat was hidden inside the Hex Data.
That’s where attackers encode malicious function calls such as:
approve()increaseAllowance()transferFrom()setApprovalForAll()sweepToken()(custom malicious contract functions)
Each of these functions grants control of your assets to the attacker.
Once signed, it’s game over — they can drain your ERC-20 tokens or NFTs at will, without further approval.
2. Hex Data: Not Meant To Be a Blind Spot
Every on-chain transaction — even without transferring assets , is essentially a smart contract call.
The so-called Hex Data is just ABI-encoded “method + parameters”.
Example:
0xa9059cbb0000000000000000000000008e8...0000000000000000000000000000000000000000000000000000000005f5e100
The first 4 bytes
0xa9059cbb: function selector, in this casetransfer(address,uint256)The rest: encoded parameters — token address, recipient, value, etc.
To an attacker, this is a universal pass to execute arbitrary logic.
To an unaware user, it’s just a meaningless string — like a cryptic spell in a language they don’t understand.
And that’s where the trap lies: blind signing.
What looks like a 0-value transaction to you…
…looks like full access to your wallet to the attacker.
3. Blind Signing, Hex Signing, and the Signature Hell
These scams tend to share a set of common traits:
💸 0 ETH or small-value transaction: to disarm your skepticism.
🧬 Hex Data carries malicious intent: disguised as a simple action.
🧠 Recipient is a smart contract: not a person — but a trap.
⚠️ Signature = execution: one click gives them full control.
And what’s worse:
These attacks are fully automated.
Scammers use scripts to mass-deploy malicious contracts, spin up phishing websites, generate scam links, and promote them via:
Search engine ads
Discord groups
Twitter/X replies
Fake giveaways & NFT airdrops
They’re just waiting for that one moment — when you click.
One signature, and your assets are theirs.
4. How OneKey Fights Back
Security should never be the user’s burden alone.
At OneKey, we’re building a multi-layered defense to close these hidden gaps.
Here’s what we’ve done (and keep improving):
(1) Hex Data Warnings — The First Mental Barrier
When a user enables the option to "show Hex Data" in a transaction,OneKey immediately displays a clear warning:
⚠️ This transaction includes Hex Data and may involve smart contract interaction or token approvals. Be cautious.
It’s not a post-signature regret.
It’s a preemptive defense, at the very first click.
We want users to stay vigilant — because Hex Data is a powerful tool, but also a weapon in the wrong hands.
(2) Hex Data Parsing + High-Risk Function Alerts
For all EVM chains, OneKey now provides real-time ABI decoding + function risk analysis:
Clearly shows the method being called
Highlights high-risk behavior before you sign, including:
🧾 Target address visibility — Is this a known safe contract or a suspicious address?
🕵️ Historical interactions — Have you signed with this address before?
💰 Token & amount — What exactly are you approving or sending?
With this, users no longer sign blindly — but with real context and full awareness.
(3) Hardware Wallet Confirmation
With OneKey Pro, you don’t see raw Hex strings.
You see real, human-readable information right on your device screen:
🔍 Function name — Know what you’re actually signing.
💵 Token type & amount — Are you authorizing your entire balance?
📍 Destination address — Is this familiar, or a red flag?
Every field is here to help you make an informed decision,
not a blind guess.
5. Final Words
There’s no “undo” on the blockchain.
Every signature is final.
We know how easy it is to think:
“I thought I was just connecting my wallet…”
That’s why we’ve built every layer of OneKey with real user protection in mind.
Every signature is a matter of trust.
And OneKey is here to be the most trustworthy defense you have.