Imagine shopping online but only being able to buy one item at a time, checking out for each purchase. It's not just inconvenient; it's a waste of time. In the world of blockchain, users have faced a similar dilemma. However, a new proposal called EIP-7702 is trying to change all that, making 'batch transactions' possible, but also quietly opening the door to new risks.

You might be thinking, 'Batch transactions sound convenient, what could be the problem?' That's the core question this article aims to answer. We will delve into how EIP-7702 works, why it has become a breeding ground for a new type of 'EIP-7702 phishing' scam, and provide you with a set of practical security strategies.

Core Interpretation of EIP-7702: How Does It Change the Way We Transact?

In simple terms, EIP-7702 is a technical upgrade proposal for the Ethereum network that allows an Externally Owned Account (EOA) to temporarily gain some functionalities of a smart contract within a single transaction. This means that operations that previously required multiple steps, such as 'approving a token' and 'executing a swap,' can now be bundled into a single 'atomic' operation and completed at once.

We can use a real-life analogy. Imagine you're a delivery driver with a regular car (representing an EOA). You suddenly get an order for a large item that won't fit in your car. So, you temporarily rent a trailer and attach it to your car (representing the temporary code granted by EIP-7702) to successfully complete the delivery. After the delivery, you immediately return the trailer, and your car goes back to being a regular car.

EIP-7702 is like this 'temporary trailer.' It is only effective for a single transaction, and the account reverts to its original state after the transaction is completed. The original intention of this design is to improve user experience and efficiency, such as enabling more complex transaction logic, batch processing multiple operations, and allowing third parties to pay for gas fees.

The Dark Side of Batch Transactions: An In-Depth Analysis of EIP-7702 Phishing Scams

The convenience brought by EIP-7702 is undeniable, but its 'bundling' and 'authorization' features have also been targeted by malicious actors, giving rise to highly deceptive 'EIP-7702 phishing' scams. The danger of these scams lies in their ability to bundle malicious operations with legitimate ones, tricking users into 'one-click authorizing' everything without their knowledge.

Imagine you receive a seemingly legitimate airdrop offer, and the page prompts you to claim it with a single click. When you sign the transaction, you think you are just performing a simple 'claim' operation. However, attackers leverage EIP-7702's batch processing capabilities to secretly bundle another malicious instruction into this transaction, such as 'grant infinite approval for all of your Token A to the attacker's address.'

Once you sign, both operations are executed simultaneously. You do receive a few airdropped tokens, but at the same time, other valuable assets in your wallet are silently drained. According to reports from blockchain security firms, there have already been multiple phishing attacks leveraging EIP-7702, causing substantial losses for users, with single incidents amounting to millions of dollars.

The Final Line of Defense Before Signing: Identifying Key Signals of Malicious Authorization

Given how stealthy EIP-7702 phishing is, how can we defend against it? The key is to develop the habit of carefully reviewing transaction details before signing in your wallet. This final line of defense is crucial.

When you interact with an application and need to sign a transaction, your wallet will display a pop-up window showing all the operations that will be executed. Here are some key red flags to watch out for:

• Unexpected Authorization Requests (approve/setApprovalForAll): If you only intend to make a simple transfer or claim, but the transaction details include a request for 'unlimited approval' for a certain token, it is highly likely a trap.

• Unclear Batch Operations: Be wary of transactions that bundle multiple, unrelated operations together. For example, an action that appears to be for participating in a project might be bundled with an instruction to transfer assets to an unknown address.

• Vague or Unintelligible Operation Descriptions: A well-designed and trustworthy application will display its transaction intent in clear, understandable language within the wallet. If the transaction details show a complex hexadecimal string or a vague description, stop the operation immediately.

• Urgency and Pressure Tactics: Many phishing sites use words like 'limited time' or 'last chance' to create a sense of urgency and pressure you into signing quickly. When you encounter this, you should be even more calm and cautious.

Ultimate Security Practices: Strategies to Effectively Mitigate EIP-7702-Related Risks

In addition to being vigilant when signing, establishing a comprehensive set of security habits can help you systematically avoid EIP-7702 phishing and other potential risks.

1. Use a 'Hot' Wallet for Interactions: Prepare an 'interaction wallet' or 'burner wallet' with only a small amount of funds, specifically for trying out new and not-yet-fully-trusted applications. Store the majority of your assets in a 'cold wallet' or hardware wallet that rarely interacts with any applications.

2. Regularly Review and Revoke Approvals: Periodically use professional blockchain explorers or third-party approval management tools to check which contracts your address has granted permissions to. For approvals that are no longer in use or look suspicious, revoke them immediately.

3. Be Skeptical of Links from Unknown Sources: This is a fundamental principle for preventing all types of phishing attacks. Do not click on unknown links shared on social media, in emails, or in private messages. Always access applications through their official channels.

4. Choose Wallets that Prioritize Security and Transparency: A good wallet will strive to parse and simulate the results of a transaction, warning users of potential risks in clear language rather than just displaying raw data.

A Shared Ecosystem Responsibility: How Wallets and DApps Should Enhance EIP-7702 Security

User security awareness is crucial, but building a safer Web3 environment is the shared responsibility of all ecosystem participants.

• For Wallet Developers: It is necessary to continuously optimize transaction simulation and risk warning features. When detecting EIP-7702-related batch transactions, they should display the details and potential consequences of each sub-operation to the user in a more prominent way, especially for high-risk actions like approvals and transfers.

• For Application (DApp) Developers: They should adhere to the principle of transparency when designing interaction flows and avoid requesting unnecessary permissions. At the same time, they must strengthen front-end security to prevent their websites from being hacked and injected with malicious phishing code, thus protecting users from being misled.

In conclusion, EIP-7702 is like a double-edged sword. While it enhances the efficiency of the Ethereum network, it also places higher demands on user security awareness and the entire ecosystem's security infrastructure. By understanding its mechanics, identifying potential EIP-7702 phishing traps, and adopting a multi-layered defense strategy, you can enjoy the conveniences of technological advancement while maximally protecting your digital assets. Ultimately, choosing platforms that prioritize user security, have a good reputation, and are market-tested for learning and interaction is the first step to ensuring safety.

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