Key Takeaways
Proof of stake, or PoS, is a consensus mechanism that selects validators to propose and verify new blocks based on the amount of cryptocurrency they lock up as stake, rather than on computational power as in proof of work.
Liquid staking tokens like stETH allow stakers to earn yield while maintaining liquidity for use in decentralized finance, while restaking protocols such as EigenLayer enable stakers to earn additional rewards by securing secondary networks, though this introduces additional slashing and contract risk.
An active debate in the Ethereum community centers on whether staking issuance rates should be reduced to improve ETH scarcity and store-of-value characteristics, or whether cuts would harm DeFi total value locked and network security by reducing staking participation.
Introduction
Proof of Stake is by far the most popular choice for blockchain networks today. But with so many variations, it can be tricky to understand its core concepts. Nowadays, you're unlikely to see it in its original form. Nevertheless, all kinds of Proof of Stake share the same key core concepts. Understanding these similarities will help you make better choices about the blockchains you use and how they operate.
What Is Proof of Stake?
Proof of stake is a consensus mechanism used by blockchain networks to validate transactions, create new blocks, and maintain the integrity of the distributed ledger. Unlike proof of work, where miners compete using computational power to solve cryptographic puzzles, proof of stake selects validators based on the amount of cryptocurrency they commit, or stake, as collateral. A validator who acts dishonestly risks losing some or all of their staked funds through a penalty known as slashing.
The core premise of PoS is that validators have a financial disincentive to attack the network because doing so would damage the value of their own stake. This creates a security model grounded in economic rationality rather than energy expenditure. The more value staked across a network, the more it would cost an attacker to accumulate enough stake to compromise consensus, and the more they stand to lose if they attempt to do so.
Proof of stake was designed to address two primary limitations of proof of work: its high energy consumption, and the tendency for mining to centralize around regions with cheap electricity and manufacturers with access to specialized ASIC hardware.
The successful transition of Ethereum from proof of work to proof of stake in September 2022, known as the Merge, demonstrated the feasibility of running a large-scale, economically significant network on PoS. Since then, PoS has become the default consensus model for new smart-contract platforms, including Solana, Cardano, Polkadot, Avalanche, and Cosmos.
How Does Proof of Stake Work?
In a proof of stake network, participants who want to become validators must deposit a minimum amount of the network's native token into a staking contract. For Ethereum, the minimum stake is 32 ETH per validator. The protocol then pseudorandomly selects validators to propose new blocks and attest to the validity of blocks proposed by others. Validators earn rewards in the form of newly issued tokens and, on some networks, a share of transaction fees for participating correctly.
The selection process is designed to be unpredictable but proportional: a validator with more stake has a higher probability of being chosen, but cannot control exactly when it will be called upon. This randomness makes it difficult for an attacker to coordinate a targeted assault. Validators who fail to stay online, validate incorrect blocks, or attempt to manipulate the system can be penalized. Minor infractions typically result in small deductions or temporary inactivity penalties, while serious attempts to compromise the network can lead to slashing, where a substantial portion of the validator's stake is destroyed and the validator is forcibly removed from the set.
Many PoS networks also support delegation, where users who lack the minimum stake requirement or the technical capacity to run a validator can delegate their tokens to an existing validator and share proportionally in the rewards, minus a service fee. This is often facilitated through smart contracts and staking platforms. In practice, delegation and staking-as-a-service providers have made staking accessible to a much broader user base than mining ever was under proof of work.
Proof of Stake vs. Proof of Work
The most frequently cited difference between proof of stake and proof of work is energy consumption. Ethereum's Merge reduced the network's energy usage by approximately 99.95%, transforming it from an energy-intensive protocol comparable to a mid-sized country to one whose environmental footprint is negligible. This has made PoS networks more attractive to institutions and regulators increasingly focused on environmental, social, and governance, or ESG, considerations.
Beyond energy, the two models create different security dynamics and economic structures. Proof of work ties security directly to hardware and electricity costs: attacking a PoW network requires vast physical infrastructure and ongoing operational expenditure, making sustained attacks prohibitively expensive. Proof of stake ties security to capital locked within the network, which means the cost of an attack is directly linked to the token's market price and the amount of stake at risk. Both models have demonstrated resilience, and the choice between them often reflects differing priorities around decentralization, sustainability, and economic design.
Some networks, such as Decred, employ hybrid PoW/PoS models that combine aspects of both consensus mechanisms to balance security, governance, and energy efficiency. Bitcoin, the largest cryptocurrency by market capitalization, continues to operate on proof of work, with its community generally maintaining that the real-world resource cost of mining is essential to the network's security and its role as a neutral settlement layer.
Staking and Liquid Staking
A more recent development is restaking, popularized by protocols such as EigenLayer, which allows validators to reuse their staked ETH to secure additional services, such as data availability layers, oracle networks, and application-specific chains. Restaking stacks additional yield on top of base staking rewards, but it also layers on additional slashing conditions. A bug or misconfiguration in a restaked service could lead to losses on the underlying validator stake. The Kelp DAO exploit that took place in April 2026, resulted in approximately $293 million in losses, highlighted the risks associated with complex DeFi wrappers around staked positions and underscored the importance of understanding the security assumptions of any staking derivative.
The growing staking ratio has also sparked debate about network economics. As more ETH is staked, the base issuance rate per validator declines through natural protocol mechanics, compressing yields from approximately 4% at a 20% staking rate to around 3% at current participation levels, excluding MEV and tips. Some analysts and institutions, including Grayscale, have argued for a deliberate reduction in staking issuance to improve ETH scarcity and reinforce its store-of-value characteristics. Others, including core contributors to liquid staking protocols, warn that cutting issuance too aggressively could reduce DeFi total value locked, weaken the economic incentives for validators, and affect overall network security. Any change to issuance would require a hard fork, with the Glamsterdam upgrade (following the Fusaka upgrade) seen as the earliest practical window for such a change.
FAQ
What is proof of stake?
Proof of stake is a consensus mechanism where validators are selected to propose and verify blocks based on the amount of cryptocurrency they lock as stake. It serves as the security model for Ethereum, Solana, Cardano, and most other major smart-contract platforms launched since 2020, offering an energy-efficient alternative to proof of work.
How do you earn rewards from staking?
Stakers earn rewards by locking their tokens in a staking contract and participating in block validation, either by running a validator node directly or by delegating tokens to an existing validator. Rewards come from newly issued tokens and, on some networks, a share of transaction fees. For Ethereum, nominal staking yields are currently around 3% annually, though additional income from MEV and restaking can increase effective returns.
This content is presented for informational and educational purposes only and should not be construed as financial advice.
What is liquid staking?
Liquid staking allows participants to stake their tokens and receive a liquid derivative token in return, such as Lido's stETH for Ethereum, which can be used in DeFi protocols while the underlying deposit continues earning staking rewards. Liquid staking has been the primary driver of Ethereum's staking participation rising above 30% of total supply, as it removes the liquidity cost that previously kept many holders from staking.
What is restaking?
Restaking is a model, popularized by EigenLayer, that allows validators to reuse their staked ETH to secure additional networks and services beyond the base Ethereum protocol. Validators earn extra yield but accept additional slashing conditions tied to each service they secure. Restaking increases capital efficiency but also introduces correlated risk, as a failure in one secured service could potentially cascade into losses on the underlying staked principal.
Are there risks to staking?
Yes. Stakers face slashing risk if their validator behaves dishonestly or experiences extended downtime, as well as smart contract risk when using liquid staking or restaking protocols. Additionally, during periods of high exit demand, validators may face delays in withdrawing their stake due to exit queue mechanics. Market volatility can also affect the value of staked assets, and the value of liquid staking tokens may diverge from the underlying asset in stressed market conditions.
Closing Thoughts
Proof of stake has evolved from a theoretical alternative to proof of work into the dominant consensus mechanism of the smart-contract blockchain ecosystem. Ethereum's successful Merge demonstrated that PoS can secure a network of substantial economic value, and the subsequent growth in staking participation, liquid staking, and restaking shows that capital markets have embraced the model. The key questions for PoS going forward are not about whether it works, but about how to calibrate its economic parameters, specifically around staking issuance and systemic risk, as participation continues to rise beyond original design assumptions.
Further Reading
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