超越 APY：告别黑箱信任，重估 ETH 质押的安全逻辑

For a while now, security incidents in the crypto industry have barely paused (further reading: From Binance to PHP2Shell: In the AI Era, Web Security's Defenses Urgently Need Redefining).

From trading platforms losing billions of dollars, to attacks on wallet supply chains and third-party service providers, to smart contract vulnerabilities and on-chain asset theft, a series of incidents repeatedly remind us: in the crypto world, asset security does not depend solely on whether the underlying blockchain is reliable; it also depends on who custody the assets, who controls the keys, and how many trust links exist across the entire service chain.

For ETH holders, participating in staking is no different.

Ethereum has already established a relatively mature native staking mechanism. Users can stake ETH to become network validators, earning protocol rewards while maintaining network security. But as staking has evolved into various participation methods such as exchange custody, liquid staking, and professional node services, an easily overlooked question has emerged:

Even when staking ETH, the asset control rights and security boundaries behind different solutions may be completely different.

If ETH is handed over to a third party, who exactly holds the withdrawal permission? If a professional service provider runs the validator, can users still control their principal independently? And between native staking and liquid staking, what additional potential risks arise?

Clarifying these questions may be more important than simply comparing the APY of different staking products.

1. The First Line of Defense for Staking Security: Who Holds the Withdrawal Rights to Assets?

To understand the security mechanism of ETH staking, we first need to clarify who exactly controls an Ethereum validator.

Ethereum uses the Proof-of-Stake (PoS) consensus mechanism. Users deposit at least 32 ETH into the deposit contract to activate a validator, participate in block proposals, transaction validation, and consensus proofs, and earn rewards according to network rules.

But a validator is not managed by a single key. In Ethereum's staking system, core permissions are split into two categories:

• Signing Key: used for the validator's daily operations, including submitting block proposals and validation proofs; it is the operational permission for participating in network consensus;
• Withdrawal Key: used to control the ownership of staked principal and returns, determining which designated address funds can ultimately be returned to (usually directly bound to the user's self-custody wallet address); it represents ultimate control over the assets;

The responsibilities of the two are very clear. The signing key determines whether the validator can perform its work properly, while the withdrawal key determines who can ultimately withdraw the money. This means the party responsible for running the validator does not necessarily need to have ultimate control over the assets.

Once this layer of permission separation is understood, the essential difference between custodial and non-custodial models becomes clear:

• In fully custodial staking, both types of permissions are often concentrated in the hands of the platform. Users deposit ETH into a trading platform or custodian, and the platform is responsible both for running nodes and for controlling withdrawal permissions. What users see on the front end is merely a string of account balances; whether assets can be successfully redeemed is directly constrained by the platform's own fund management, withdrawal rules, and operating condition;
• In non-custodial staking, the two types of permissions are physically isolated. Users control withdrawal permissions through their own wallets, while professional service providers hold only the signing key and are responsible for the validator's daily operations and maintenance. Even if the service provider takes over the cumbersome hardware and network maintenance, it cannot use the operational permissions in its hands to transfer away users' staked principal;

The core value of this isolated design—"withdrawal rights belong to users, operational rights belong to service providers"—lies in minimizing the trust boundary: users do not need to give up control of principal, nor do they need to bear the high cost of node operations alone.

Of course, non-custody does not mean zero risk.

The signing key still affects the validator's daily performance. If the service provider suffers a key leak, double signing, or severe downtime, the validator may still face protocol-level penalties.

Therefore, the first step in evaluating a staking solution is to see whether it strictly isolates withdrawal permissions from operational permissions, and whether users truly hold the keys to recovering their assets in their own hands.

2. How Does Ethereum's Native Protocol Protect Staked Assets?

Having understood key control rights, another key question is: why is direct participation in Ethereum native staking clearly superior in security structure to various third-party derivative staking products?

The core reason is that ETH native staking is built directly on Ethereum's underlying consensus protocol and requires no additional intermediate layers.

When users participate in native staking, ETH enters Ethereum's official validator system directly, and reward distribution and penalty enforcement are fully executed automatically by the underlying protocol code.

It does not need to rely on a third-party fund pool to aggregate assets, nor does it need to mint a derivative token (such as an LST) to indirectly map staking rights. This fundamentally eliminates the composite risks brought by third-party protocol contracts, cross-layer governance, and derivative de-pegging.

To date, within the native protocol, Ethereum has also established clear security and exit boundaries through three mechanisms.

First, the protocol constrains validator behavior through rewards and penalties.

Validators need to remain online continuously and submit block proposals and validation proofs as required. If a node fails or remains offline for a long time, it may miss rewards and suffer corresponding balance penalties.

If a validator commits more serious violations, such as signing conflicting blocks, it may trigger slashing, in which part of the staked ETH is burned and the validator is forcibly ejected from the network.

The purpose of this mechanism is to ensure that participants, while earning staking returns, must also bear corresponding responsibilities, so that any attempt to undermine network consensus must incur a real economic cost.

Second, withdrawal permissions and validator operational permissions can be independent of each other.

This is a very important design in native staking for asset security. Even if there is a problem with the validator's signing key, as long as the withdrawal key is still securely held by the user, an attacker cannot simply use the signing key to directly withdraw the user's staked principal.

After the Pectra upgrade, Ethereum further improved this mechanism: the withdrawal address can also directly initiate a validator exit operation, no longer relying entirely on the validator signing key. This gives non-custodial users an underlying safeguard to "force withdrawal of funds" under extreme circumstances.

Finally, exits from native staking are also constrained by protocol rules.

Native staking supports reward withdrawal and full principal exit, but it does not arrive instantly like an ordinary wallet transfer. After a validator initiates an exit, it enters the network-wide exit queue according to protocol rules (the queue time depends on the number of validators exiting simultaneously across the network at that time), and only after completion are the principal and remaining rewards automatically settled to the bound withdrawal address (further reading: Why Do You Have to Queue for a Month Now to Participate in Ethereum Native Staking?).

From this perspective, the value of native staking is not only obtaining ETH rewards, but also providing an underlying settlement guarantee with fully public rules, on-chain transparency and verifiability, and no dependence on any centralized institution for redemption.

3. Comparison of Four Mainstream Solutions: Where Are the Security Boundaries of Different Staking Models?

Combining "key control rights" and "protocol dependence," the four mainstream ETH staking solutions currently on the market essentially place risks in different baskets.

1. Fully Custodial Staking (Centralized Exchanges / Custodians)

Staking services provided by exchanges and custodians usually have the lowest participation threshold, support small-amount staking, and offer an operating experience close to traditional wealth management. Users do not need to handle complex technical operations.

At the same time, however, control of principal is completely transferred to the platform. Even if the underlying ETH ultimately enters Ethereum's official staking contract, users still need to bear the platform's credit risk, internal risk control risk, and withdrawal restrictions under extreme market conditions.

2. Liquid Staking (Represented by LST Protocols Such as Lido)

Taking liquid staking protocols such as Lido as an example, after users deposit ETH, they can receive an LST representing staking rights, such as stETH, making it convenient to earn secondary yield in DeFi or cash out in the secondary market at any time.

The biggest advantage of this type of solution is lowering the participation threshold and allowing users to continue participating in DeFi and other applications while staking, but the risk layer increases significantly. Holding an LST does not mean controlling validator withdrawal rights; it means holding a smart-contract-based debt certificate.

In addition to the underlying node slashing risk, users also need to bear additional smart contract vulnerability risk, protocol governance risk, and, under extreme market conditions, LST secondary market discount (de-pegging) and redemption run risk—which has already occurred multiple times in LST history.

3. Non-Custodial Native Staking (Self-Held Withdrawal Rights + Professional Node Operations)

What non-custodial native staking attempts to solve is precisely the contradiction between asset autonomy and node operations.

Users participate in the network through Ethereum's native staking mechanism and hold the withdrawal key themselves, while professional service providers are responsible for validator operation, monitoring, and maintenance. This does not require users to bear the additional de-pegging risk of liquid staking tokens, and it also reduces the extra risks brought by third-party staking pool smart contracts and governance mechanisms.

4. Solo Staking

If users have enough ETH and technical capability, they can also set up validators themselves. In this approach, the signing key, withdrawal key, and node equipment are all managed by users themselves, with no need to rely on third-party node service providers.

But this does not mean the risk is the lowest—node hardware failure, network interruption, client configuration errors, improper key backup, and even duplicate signing can all cause reward losses or slashing. Therefore, for ordinary users without long-term node operation experience, technical and maintenance costs are also a barrier.

In summary, the security differences among these models can be summarized as follows:

In short, different staking models address the needs of different capital sizes and risk preferences. For users who value absolute control over principal and do not want to spend effort maintaining servers themselves, "non-custodial native staking" is undoubtedly a more suitable security solution.

This is also the core design philosophy of the imToken non-custodial ETH staking solution: withdrawal permissions that should never be given away remain in the user's own wallet, while node operations requiring high-availability guarantees are handed over to professional infrastructure.

At the practical implementation level, this solution also offers two modes—compounding validators and auto-withdrawal validators—so users can flexibly choose different fund management methods:

• Compounding validators: all rewards generated by staking automatically remain in the validator balance and are rolled over for reinvestment, improving long-term compounding efficiency (the effective staking cap of a single validator can be expanded up to 2048 ETH);
• Auto-withdrawal validators: the validator's effective balance is maintained at 32 ETH, and consensus-layer staking rewards above that amount are automatically sent back to the user's withdrawal address periodically by the Ethereum protocol, with no manual claim required. This is suitable for users with regular cash flow needs;

Of course, choosing a non-custodial model does not mean users can simply take their hands off. Since ultimate control of assets rests entirely with users themselves, they still need to fulfill their personal security responsibilities—properly backing up wallet mnemonic phrases offline, carefully checking the withdrawal address before initiating staking, and maintaining a clear understanding of the Ethereum protocol's exit queue mechanism, service fees, and potential underlying slashing rules.

Final Thoughts

As more and more ETH enters long-term yield-generating systems, as holders, what we really need to focus on may not only be how much return our assets can earn, but also whether, when any external service link encounters an extreme situation, we still hold the final initiative to recover our principal.

Keep ultimate control of assets in your own hands, and let professionals handle professional matters.

This may be the most noteworthy security value of non-custodial native staking.