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What Should I Check Before Confirming a Transaction on a Hardware Wallet?

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Written by UKey Wallet

UKey Device Security

The core value of a hardware wallet is to isolate the private key and signature process in a secure hardware environment to prevent remote attacks on networked devices to the greatest extent. However, A hardware wallet cannot judge for you whether a transaction is compliant or meets your expectations.

If you blindly press the confirm button on your device, letting go of a wrong address, a malicious contract, or excessive authorization, the hardware wallet will still complete the signature faithfully. therefore, The "confirm" on your device screen is more than just a process step; it's your response to the transaction. Final legal and economic authorization.

In order to maintain the bottom line of asset security in every on-chain operation, UKey officially recommends that you strictly check the following before signing each time six core lists Check them one by one.

Core review formula: network - category - address - amount - right - screen

Whenever any of these don't match what you expected, or you can't explain exactly what the device is asking for, Please stop the operation immediately and refuse to sign.

1. Why do I need to recheck on the hardware device screen?

In a standard hardware wallet workflow, a mobile phone, computer or browser client is responsible for preparing transaction data and communicating with the blockchain network; UKey Core Hardware Device Responsible for independent parsing, display and signature.

The page displayed by the client may be affected by the following hidden dangers:

  • Local malware or tampered browser extensions;

  • Clipboard address replacement attack;

  • Fake websites, phishing DApps, or front-end supply chain contamination;

  • The client display is inconsistent with the actual packaged underlying transaction data.

Therefore, the client is only used to "initiate preparation" and The content displayed on the screen of the hardware device is always the last absolute truth before signing..

2. Six major elements that must be checked one by one before signing

1. Network: Confirm the blockchain network where the operation is located

Don't think that as long as you have the right address, you're safe. In the multi-chain ecosystem (such as Ethereum, BSC, Polygon, Arbitrum, Base and other EVM compatible networks), The same address format can be used across multiple chains.

  • Key points to check:Confirm the network name, mainnet and testnet identification, Chain ID, and native assets used to pay handling fees (Gas).

  • Special attention should be paid to cross-chain transactions:It is necessary to check "which chain to transfer from, which chain to receive, and what are the assets transferred out and received in advance" at the same time.

You should reject it immediately if you encounter the following situations:


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  • The network displayed by the hardware device is inconsistent with the network you intend to operate;

  • DApp automatically switches to an unknown network without warning;

  • Cross-chain transactions do not clearly indicate the target chain.

2. Transaction Type: Confirm the nature of the operation being performed

Be clear about what exactly the device is asking you to sign:

  • Ordinary transfer:Transfer native assets or tokens directly.

  • Token authorization (approve / permit):Grant a smart contract permission to call your tokens in the future (note: authorization usually does not equate to immediate transfers, but does grant long-term permissions).

  • Global authorization (setApprovalForAll):Grant the operator permission to manage the entire set of NFTs.

  • Swap / cross-chain / pledge:Complex smart contract calls.

  • Message signature (Message / EIP-712): Login, authentication or offline authorization."No need to pay gas" does not mean "no risk".

Core judgment: Before signing, answer yourself in one sentence: "Am I transferring, authorizing, revoking or signing?" If you can't tell the type, never sign blindly.

3. Address: Prevent address poisoning and wrong transfers

  • Ordinary transfer:Double check the complete characters of the payment address. Don't just look at the first and last four digits to avoid "address poisoning" attacks (where an attacker generates fake addresses with similar beginnings and ends and mixes them into history).

  • Smart contracts and authorized objects: Check the target contract address of the call or the authorized one spender Whether the address comes from an official, trustworthy source.

4. Amount & Allowance: Know the tokens and quantity clearly

  • Check elements:Are the asset symbols, token contract addresses, specific quantities and decimal places sent correct?

  • Be wary of the "zero amount" trap: Transactions showing 0 ETH do not equal safety. Many contract calls (such as approve,setApprovalForAll) does not consume native assets, but will grant high or even unlimited transfer rights.

  • Check authorization amount: If you only need to authorize 10 USDC to a protocol, but you see on your device screen Unlimited(unlimited limit) or exceeding the limit, you should stop immediately and lower the limit.

5. Authorization object (Spender): Who will obtain your token authority?

For all transactions involving tokens, NFT licenses or Permit The signature operation must be clear:

  • Which address (contract) has obtained the operation permission?

  • Is the authorization long-term, permanent, or just for this transaction?

  • Is the entire collection of NFTs licensed rather than a single NFT?

Warm reminder: The hardware wallet only protects your private key and will not help you determine whether a contract address is a phishing trap. Contracts that you do not trust will never be authorized.

6. Device Screen: Final verification and consistency confirmation

After completing the first five checks, read page by page UKey Core hardware device physical screen All text on:

  • Make sure the screen displays exactly what the client expects.

  • If the address is too long, use your device keys to scroll to see the full content.

  • If a large segment of hexadecimal data that cannot be understood appears and the device cannot provide readable analysis:Please refuse to sign immediately. Blind signing of hex data is a common cause of asset compromise.

3. Follow-up habits after signing

After the transaction broadcast is successful, it is recommended to develop the following good habits:

  1. On-chain review:Check the transaction hash through the official block explorer (Block Explorer) to confirm that the final flow direction and amount are correct.

  2. Permission management:Regularly check and clean up historical token authorizations that are no longer in use through trusted third-party tools (officially recommended channels such as Revoke).

Conclusion

The hardware wallet builds an insurmountable security boundary for your private keys, and Check device screen This is your unshirkable responsibility as the asset owner.

Each time before pressing the confirm button on UKey Core, please recite this mantra silently:

Internet, right? Is the type correct? Is the address correct? Is the amount correct? Authorized to whom? Does the device screen look different than I expected?

Treat every signature carefully so that you can enjoy the freedom of Web3 while firmly guarding the security of your assets.

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