What is EIP-7702? A Quick Overview of Its Core Purpose and Impact!

The Ethereum Pectra upgrade, expected to arrive in April of this year, will mark another important milestone for the Ethereum ecosystem. As smart contract developers, we are full of anticipation for the EIP-7702 proposal that will be activated in this upgrade. EIP-7702 defines a brand new transaction type, namely "Set Code Transaction". Through this transaction, users can "map" the execution logic of any smart contract to an Externally Owned Account (EOA).

This means that users only need to sign a Set Code Transaction to enable their existing EOA accounts to not only possess smart contract execution logic, but also retain their original EOA characteristics (such as signing transactions with a private key). This upgrade is an important step toward achieving Ethereum's goal of "ultimate account abstraction," and will greatly promote the widespread adoption of smart accounts.

In the following series of articles, we will approach from a developer's perspective to deeply analyze the impact of EIP-7702 on smart account wallets, and explore corresponding security issues and solutions.

The New Role of EOA Private Keys

After an EOA is endowed with smart contract logic to become a Smart Account, its private key becomes the "super administrator" of the account, with two key permissions:

1. By signing with the private key, one can revoke or change the smart contract mapped to that account, thereby changing the account's execution logic;

2. By signing with the private key, one can directly transfer ETH or ERC20 tokens under the account, bypassing restrictions set by the contract logic.

At this point, assets in the account will have two "administrators": the newly added smart contract logic and the original private key, with the private key possessing higher authority. This brings two important considerations:

Storage of Critical Account Data

Since the mapped smart contract logic can be changed at any time, the first problem to solve is how to handle existing critical data and contract state in the account. The new contract may read or overwrite any data from old contracts, which creates a "storage collision" risk. If you're not yet familiar with the concept of "storage collisions," this article provides a detailed introduction.

Developers may think that "storage collisions" are not a difficult problem to solve, because when developing "upgradeable contracts," there are many patterns that can well avoid this issue. For example, we can use ERC-7201 or similar methods, using storage namespaces to avoid collisions. However, we want to emphasize that the essential difference between "switching account code" and "upgrading account contracts." Upgrading contracts is typically functional iteration on trusted, identical wallet service provider code, with a clear chain of trust; whereas switching account code may involve different or even malicious wallet providers, so merely preventing storage collisions is insufficient—one must also deeply consider how to prevent malicious code from specifically damaging critical account data.

We have some ideas and solutions for how to solve this problem, which will be discussed in detail in subsequent articles.

New Account Control Model

"Not Your Keys, Not Your Coins" is a widely circulated security principle in the cryptocurrency industry. In self-custody scenarios, using a hardware cold wallet to store private keys is a good security practice, but this also makes transaction signing complex—users need to carry hardware devices with them, which many users find inconvenient.

After the 7702 upgrade, we have a brand new account control method: users can place the private key with "super authority" in a hardware cold wallet, while using contract logic-based "tiered permissions" to control assets on the account. This way, users not only have better security practices, but also balance a good wallet user experience.

Simplicity and Power Coexist

7702 is an upgrade to EOAs, and the functions possessed by "native EOAs" remain unchanged after becoming "7702-EOAs." We predict that for users who already have EOAs, in most scenarios they will still use their wallets in the original way, but in certain special scenarios where "native EOAs" cannot be realized, "7702-EOAs" will provide a better user experience:

1. Batch Contract Calls

EOA users who are accustomed to using DEXs for on-chain trading may feel that the current user experience is not very ideal, because they must send two separate transactions, approve and swap, to achieve token exchanges. This not only requires paying more gas, but sometimes the delay of the approve transaction can also lead to increased price slippage for trading pairs.

"7702-EOA" allows batch processing of contract calls, combining approve and swap into a single transaction, thereby significantly saving gas costs. We have a successful case of significantly saving gas through batch contract calls, and will share relevant statistical data and optimization results in subsequent articles.

2. Gas Abstraction

In "native EOAs," accounts need to possess sufficient native tokens to pay for gas before they can initiate transfers. This often leads to an awkward situation for first-time EOA users where they cannot transfer ERC-20 tokens due to insufficient native tokens. "7702-EOA" can achieve gas abstraction by having a third party initiate transactions and pay gas on behalf of users. This gas payment process can be free or paid, and users and third parties can flexibly decide the fee settlement method (using native tokens, ERC-20 tokens, or fiat currency), which greatly optimizes the on-chain transaction experience.

3. Using Sessions to Implement Account Asset Access Permission Delegation and Isolation

On "7702-EOAs," users can flexibly implement account asset access permission delegation and isolation by signing "Sessions." Users can add fine-grained control conditions to each session, such as: validity period, asset type, visitor address and amount limits, etc.

Sessions can provide convenient permission management while ensuring account security, suitable for various scenarios such as regular transfers or authorizing dApps for periodic investment plans.

4. Considerations for "Optimizing Gas Costs"

Although optimizing gas costs is not a function of 7702 itself, we still want to raise it for discussion in the following articles. This is because we know that minimizing gas costs is key to driving widespread adoption, and the vast majority of users are sensitive to transaction costs. If contract accounts consume excessive gas, many users will abandon using contracts and continue remaining in the "native EOA" account ecosystem.

In subsequent articles, we will discuss how to design 7702 account contracts and corresponding wallet services to implement the powerful features mentioned above while ensuring minimized gas costs, thereby promoting widespread adoption of smart accounts.

Summary

EIP-7702 marks a major shift in the Ethereum ecosystem's concept of accounts, bridging the gap between EOAs and smart accounts. Our view is that the ideal smart account should strike a balance between complexity and functionality—simple yet powerful. Features such as contract batch calls, gas abstraction, session-based permission management, and gas optimization not only make "7702-EOAs" more practical, but also make them a powerful alternative to "native EOAs." At the same time, prudent storage management and refined account control models are crucial for maintaining security and preventing abuse.

Our ultimate goal is to provide a smooth transition path for users accustomed to using EOAs, and to unleash the full advantages of smart accounts in corresponding scenarios. Subsequent articles in this series will delve into the features mentioned above, as well as our views on related trade-offs.

Disclaimer

This article may contain product-related content not applicable to your region. This article is intended to provide general information only and does not assume responsibility for any factual errors or omissions herein. This article represents only the author's personal views and does not represent the views of OKX. This article is not intended to provide any advice, including but not limited to: (i) investment advice or investment recommendations; (ii) offers or solicitations to purchase, sell, or hold digital assets; or (iii) financial, accounting, legal, or tax advice. Holding digital assets (including stablecoins) involves high risk, may fluctuate significantly, and may even become worthless. You should carefully consider whether trading or holding digital assets is suitable for you based on your financial situation. For questions regarding your specific situation, please consult your legal/tax/investment professional. The information appearing in this article (including market data and statistics, if any) is for general reference only. Although we have taken all reasonable precautions in preparing these data and charts, we assume no responsibility for any factual errors or omissions expressed herein. © 2025 OKX. This article may be reproduced or distributed in its entirety, or excerpts of 100 words or less from this article may be used, provided that such use is non-commercial. Any reproduction or distribution of the entire article must also prominently state: "This article is copyrighted © 2025 OKX, used with permission." Permitted excerpts must cite the article name and include attribution, for example "Article Name, [Author Name (if applicable)], © 2025 OKX". Portions of this content may be generated or assisted by artificial intelligence (AI) tools. Derivative works or other uses of this article are not permitted.

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