Beyond APY: Moving Beyond Black-Box Trust and Reassessing the Security Logic of ETH Staking

Author: imToken

In recent months, security incidents across the crypto industry have been nearly constant (further reading: From Binance to PHP2Shell: Web Security Defenses Need to Be Redefined in the AI Era).

From trading platforms losing billions of dollars, to wallet supply chains and third-party service providers being attacked, to smart contract vulnerabilities and theft of on-chain assets, a series of events repeatedly reminds us that in the crypto world, asset security depends not only on the reliability of the underlying blockchain, but also on who holds assets, who controls keys, and how many trust dependencies exist across the entire service chain.

For ETH holders, participating in staking is no exception.

Ethereum has established a relatively mature native staking mechanism. Users can stake ETH to become network validators, earning protocol rewards while helping maintain network security. However, as staking has gradually developed into multiple participation models such as exchange custody, liquid staking, and professional node services, an easily overlooked question has also emerged:

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

If ETH is handed over to a third party, who actually holds withdrawal authority? If a professional service provider runs validators, can users still independently control their principal? And what additional potential risks exist between native staking and liquid staking?

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

The first line of defense in staking security: who controls asset withdrawal rights?

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

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

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

Signing Key: used for the day-to-day operation of validator nodes, including submitting block proposals and attestations, representing the operational authority to participate in network consensus; Withdrawal Key: used to control the ownership of staked principal and rewards, determining the designated address to which funds can ultimately be returned (typically bound directly to the user's self-custody wallet address), representing final control over the assets.

The responsibilities of the two are very clear: the signing key determines whether a validator can operate normally, while the withdrawal key determines who can ultimately withdraw the funds. This means that the party responsible for running a validator does not necessarily need to have final control over the assets.

Understanding this permission split makes the essential difference between custodial and non-custodial models clear:

In fully custodial staking, both types of permissions are often concentrated in the platform's hands. Users deposit ETH into a trading platform or custodian, and the platform is responsible for node operation while also controlling withdrawal permissions. What users see on the frontend is only an account balance; whether assets can be redeemed smoothly is directly subject to the platform's own fund management, withdrawal rules, and operating condition. In non-custodial staking, the two permissions are physically separated. Users control withdrawal permissions through their own wallets, while professional service providers hold only signing keys and are responsible for day-to-day node operations. Even if providers take over complex hardware and network maintenance, they cannot use their operational authority to move users' staked principal.

This separation design, with withdrawal rights belonging to users and operational rights belonging to service providers, has core value in minimizing the trust boundary. Users do not need to give up control over their principal, nor do they need to bear high node operation and maintenance costs alone.

Of course, non-custodial does not mean zero risk. The signing key still affects a validator's day-to-day performance. If a service provider experiences key leakage, double signing, or severe downtime, validators may still face protocol-level penalties.

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

How does Ethereum's native protocol protect staked assets?

After understanding key control, another key question arises: why is direct participation in Ethereum native staking clearly superior to various third-party derivative staking products in terms of security structure?

The core reason is that ETH native staking is built directly on Ethereum's underlying consensus protocol, without the need to add extra intermediary 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 rely on a third-party pool to aggregate assets, nor does it require minting a derivative token (such as an LST) to indirectly map staking rights, thereby eliminating at the source the compounded risks arising from third-party protocol contracts, cross-layer governance, and derivative depegging.

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 must remain online continuously and submit block proposals and attestations as required. If a node fails or goes offline for an extended period, it may miss rewards and incur corresponding balance penalties. If a validator commits a more serious offense, such as signing conflicting blocks, it may trigger Slashing, in which part of the staked ETH is burned and the validator is forcibly exited from the network. The purpose of this mechanism is to ensure that participants bear corresponding responsibilities while earning staking rewards, so that any attempt to undermine network consensus carries a real economic cost.

Second, withdrawal authority and validator operation authority can be independent. This is a very important design for asset security in native staking: even if a validator's signing key is compromised, as long as the withdrawal key remains 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 validator exit operations, no longer relying entirely on the validator signing key, giving non-custodial users a foundational safeguard to 'force withdraw funds' in extreme situations.

Finally, exits from native staking are also governed by protocol rules. Native staking supports reward withdrawals and full principal exits, but funds do not arrive instantly like a normal wallet transfer. After a validator initiates an exit, it must enter the network-wide exit queue in accordance with protocol rules (queue time depends on the number of validators exiting simultaneously across the network at that time). Only after completion are the principal and remaining rewards automatically settled to the linked withdrawal address (further reading: 'Why is there a one-month queue when joining Ethereum native staking now?').

From this perspective, the value of native staking lies not only in earning ETH rewards, but also in providing a foundational settlement safeguard whose rules are fully public, transparent and verifiable on-chain, and independent of any centralized institution for redemption.

A side-by-side breakdown of mainstream approaches: where are the risks actually distributed?

Looking at 'key control' and 'protocol dependency' together, the four mainstream ETH staking options currently in the market essentially place risk in different baskets.

Staking services offered by exchanges and custodians usually have the lowest participation barriers, support small staking amounts, and provide an experience close to traditional wealth management, so users do not need to handle complex technical operations. At the same time, however, control of the principal is fully transferred to the platform. Even if the underlying ETH ultimately enters Ethereum's official staking contract, users still bear the platform's credit risk, internal risk-control risk, and withdrawal restrictions during extreme market conditions.

Taking liquid staking protocols such as Lido as an example, after users deposit ETH, they receive an LST representing staking rights, such as stETH, which makes it convenient to earn additional yield in DeFi or realize liquidity on secondary markets at any time. The biggest advantage of this type of solution is lowering the participation barrier and allowing users to continue participating in DeFi and other applications during staking, but the risk layers increase significantly. Holding an LST is not equivalent to holding validator withdrawal rights; it is a smart-contract-based claim. In addition to underlying node slashing risk, users also bear additional smart contract vulnerability risk, protocol governance risk, and the risk of LST secondary-market discounts (depegging) and redemption runs during extreme market conditions, which has occurred multiple times in the history of LSTs.

Non-custodial native staking seeks to resolve exactly the tension between asset self-custody and node operations. Users participate in the network through Ethereum's native staking mechanism and retain control of their withdrawal keys, while professional service providers are responsible for running, monitoring, and maintaining validators. This removes the need for users to bear additional depegging risk associated with liquid staking tokens and reduces the additional risks introduced by third-party staking pool smart contracts and governance mechanisms.

If users hold enough ETH and have the technical capability, they can also set up their own validator nodes. In this model, signing keys, withdrawal keys, and node equipment are all managed by the users themselves, without relying on third-party node providers. However, this does not mean the risk is lowest. Node hardware failures, network outages, client configuration errors, improper key backups, or even double signing can lead to reward losses or slashing. Therefore, for ordinary users without long-term node operations experience, the technical and maintenance costs are also a barrier.

Keep Control in Your Own Hands: The Long-Term Value of Non-Custodial Staking

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

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

In practice, this solution offers two modes, compounding validators and auto-withdrawal validators, allowing users to flexibly choose different fund management approaches.

Of course, choosing a non-custodial model does not mean users can take a completely hands-off approach. Because ultimate control over assets rests entirely with the user, users still need to fulfill their personal security responsibilities: securely back up wallet recovery phrases offline, carefully verify withdrawal addresses before initiating staking, and maintain a clear understanding of Ethereum's exit queue mechanism, service fee rates, and potential underlying slashing rules.

As more ETH enters long-term yield systems, what holders should truly focus on may not just be how much yield their assets can earn, but whether they still retain the ultimate control to reclaim their principal when any external service component encounters an extreme situation?

Keep ultimate control over assets in your own hands, and let professionals handle what they do best. This may be the most noteworthy security value of non-custodial native staking.

Source: 深潮 TechFlow