Day 12 — Mining vs staking (PoW vs PoS) and where yield actually comes from
The single most useful question to ask in crypto is "where is the yield actually coming from?" Most retail losses in this space happen because someone offered an attractive yield, the user did not ask the question, and the source turned out to be either fraudulent or unsustainable. Today's lesson is the structural answer.
Yield in crypto comes from a small number of real mechanisms. Understanding those mechanisms is the difference between participating safely and getting flattened by the next yield-bearing thing that turns out to be a Ponzi.
The two most fundamental sources of yield are mining and staking. Both pay participants for helping secure a blockchain network. Both involve real economic activity. Both produce returns that are paid in the chain's native token rather than coming out of nowhere. They are different mechanisms, used by different chains, with different economic profiles.
Let's start with mining.
Mining is the mechanism Bitcoin uses to secure its network. Miners run specialized computers (called ASICs, for Application-Specific Integrated Circuits) that compete to solve cryptographic puzzles. The first miner to find a solution for the current block gets to add it to the chain and earns a block reward: a fixed amount of newly issued bitcoin (currently 3.125 BTC per block, post-2024 halving) plus the transaction fees from everyone whose transactions are in that block.
This is proof-of-work, which we introduced on Day 2. The work being proved is the computational effort spent finding the solution. The energy expenditure is enormous (Bitcoin mining consumed roughly 150 terawatt-hours in 2024, about the same as Argentina). The economic logic is that the cost of mining is what makes attacks expensive: to rewrite Bitcoin's history, you would need to acquire more computing power than the entire rest of the network combined, which would cost billions and be detected almost instantly.
Mining is a real business. The largest miners are public companies (Marathon Digital, Riot Platforms, CleanSpark, others) with billions in revenue and stock prices that move with both Bitcoin's price and the network's difficulty. Difficulty adjusts automatically every two weeks to keep block times around 10 minutes, regardless of how much computing power is on the network. The system is self-balancing.
For retail users, mining bitcoin yourself is no longer practical. The compute required to be competitive is industrial-scale, the equipment is expensive, and the margins are thin. If you want exposure to mining, the path is owning shares in a public miner or owning bitcoin directly, which represents claims on the network the miners are securing.
Now staking.
Staking is the mechanism Ethereum (since 2022) and most modern Layer 1s use. Instead of burning electricity to compete for blocks, validators lock up the chain's native token (32 ETH minimum for Ethereum) as collateral. The chain randomly selects validators to propose new blocks. Validators who behave honestly are rewarded with newly issued tokens plus transaction fees. Validators who try to cheat (sign conflicting blocks, go offline for too long) have part or all of their staked tokens slashed (taken away by the protocol).
This is proof-of-stake, and it does the same job as proof-of-work (securing the network, deciding who adds the next block) with much less energy. Ethereum's transition from PoW to PoS in September 2022 (called The Merge) cut Ethereum's energy use by approximately 99.95%. It is one of the most technically impressive upgrades in software history. The fact that it happened without major incident is part of why Ethereum's credibility is what it is.
Where staking yield comes from: two sources. Issuance (newly minted ETH paid to validators) and fees (priority fees from transactions, plus MEV which we'll get to). The current ETH staking yield ranges from roughly 3% to 5% APY, depending on how many ETH are staked and how much activity is on the chain.
This yield is real. It is paid for real work (validating transactions, maintaining the network). It does not come from another investor's deposit. It is the closest thing crypto has to a base interest rate.
For retail users, staking has a tier structure similar to custody.
- Solo staking requires 32 ETH (~$80,000 at current prices) and running a validator node yourself. Highest yield, most operational overhead.
- Pooled staking lets you stake any amount and share validator rewards. Lido and Rocket Pool are the major decentralized pools; you receive a "liquid staking token" (like stETH from Lido) representing your stake plus rewards.
- Exchange staking lets you click a button on Coinbase or Kraken and they handle everything. Lowest yield (they take a cut), most convenient.
The "yield" you see on most "earn" products in centralized exchanges (Coinbase Earn, Kraken Staking) is just exchange staking with a fee taken out.
Now the harder question. What about the 15% APYs and 30% APYs you see advertised?
There are a few real categories worth knowing.
Real yield from DeFi. Some DeFi protocols generate genuine yield from real activity. Lending platforms like Aave pay depositors interest funded by borrowers paying interest. Liquidity providers on Uniswap earn fees from traders. These yields are real but variable, can range from 1% to 20%+ depending on market conditions, and carry smart contract risk. We'll cover DeFi in detail in Week 3.
Real-world asset yield. Products like Ondo's USDY, BlackRock's BUIDL, and similar tokenized treasury funds pay yield from actual US Treasury holdings. The yields are typically close to the Treasury rate (4-5% as of 2026). The risk is the issuer and the regulatory wrapper, both of which are improving.
Restaking and points programs. A newer category where users stake ETH and then re-pledge their staked position to secure additional services (Eigenlayer is the leading example). The yields are higher but the risks are layered: a slashing event in one of the services you've restaked to can affect your ETH. Worth understanding before participating.
Liquidity mining and incentive programs. Protocols pay you in their own native token for providing liquidity or using the product. These yields can be high but the token you're being paid in is often unproven, illiquid, and at risk of declining in value faster than the yield accrues. The yield is real but the asset you're being paid in may not be.
Ponzi mechanics. The yield is paid from new deposits rather than from real activity. Anchor protocol (the lending product that promised 20% APY on UST) was effectively this. So was Celsius. So was BlockFi's later-stage product. The pattern is: yield much higher than any real source can produce, opaque mechanics, and growth that depends on continuing inflows. When the inflows stop, the yield stops, and usually the principal stops too.
The filter to apply to any yield product: what is the source of the yield, can I verify it on-chain, and is it sustainable? If the answers are clear, the product might be worth using at the size you're comfortable losing. If the answers are murky or the math doesn't work, move on.
Tomorrow we look at the zoo of digital assets. Coins, tokens, NFTs, and the differences that matter (and the ones that don't).
Glossary
| Term | Definition |
|---|---|
| Mining | The process of competing to add new blocks to a proof-of-work blockchain in exchange for block rewards. |
| Block reward | The newly issued tokens (plus transaction fees) paid to whoever adds a new block to the chain. |
| Proof-of-work (PoW) | The consensus mechanism Bitcoin uses, where security comes from energy expenditure. |
| Proof-of-stake (PoS) | The consensus mechanism Ethereum (post-2022) and most modern L1s use, where security comes from locked-up capital. |
| Validator | A participant in a proof-of-stake network who locks up tokens as collateral to validate transactions. |
| Staking | Locking up tokens as collateral to participate in proof-of-stake validation, in exchange for rewards. |
| Slashing | The protocol-enforced penalty (loss of staked tokens) for validator misbehavior. |
| Issuance | New tokens created by the protocol to reward validators or miners. |
| MEV (Maximum Extractable Value) | The additional value validators can extract by strategically ordering transactions within a block. |
| Liquid staking token (LST) | A token representing your staked position plus accrued rewards, which remains tradeable. (stETH, rETH, etc.) |
| Restaking | Pledging your staked ETH to secure additional services beyond the base chain. (Eigenlayer.) |
| Real yield | Yield paid from genuine economic activity (lending fees, trading fees, transaction fees, real-world asset returns) rather than from inflation or new deposits. |
Reality check
You see an advertisement for "Stable, secure, 18% APY on USDC." What is the single best question to ask before you go any further?
The answer is: where is the yield actually coming from? If the platform can name the source (specific lending markets, validator-staking pass-through, real-world asset returns) and the source could plausibly generate 18%, the product might be legitimate. If they say things like "our proprietary algorithm" or "DeFi yield strategies" without specifics, you are probably looking at the next Anchor, the next Celsius, or the next Voyager. The question filters out most of the disasters in this space. Use it every time.
Read deeper
1. What is a consensus mechanism? by The Block
The framework for understanding how different chains secure themselves.
Read on IMPCT (curated commentary) | Read original (theblock.co)
Deven's take. Read this for the architectural picture. PoW and PoS are the two dominant mechanisms but they are not the only ones (Proof-of-Authority, Proof-of-History, Proof-of-Stake variants with different finality models, etc.). The shared question every consensus mechanism answers is "how do we decide whose version of the truth wins?" Different chains have different answers, and the differences matter for security, decentralization, and yield.
2. How does staking work and where does the yield come from? by The Block
The clearest single piece on staking yield.
Read on IMPCT (curated commentary) | Read original (theblock.co)
Deven's take. The most important article from today's recommendations. The Block does a careful job of explaining what staking yield is, where it comes from, and why it is structurally different from "earning interest" the way a savings account does. Read this once, internalize it, and you will be calibrated for life on what "real yield" means in this space.
3. How to mine cryptocurrencies by The Block
The practical primer on mining.
Read on IMPCT (curated commentary) | Read original (theblock.co)
Deven's take. Read this if you're curious how mining actually works, or if you want to understand why home mining is no longer practical for major chains. The Block does a good job of walking through the equipment, the electricity costs, the pool dynamics. Most readers will not personally mine, but the lesson is useful for evaluating mining-related investments (public mining stocks, hash-rate-backed tokens, etc.).
4. Lido and Rocket Pool (the major liquid staking protocols)
Where most ETH stakers actually stake.
Deven's take. Skim both project pages if you have ETH and want to start staking. Lido is the largest (it controls about a third of all staked ETH) and has the deepest liquidity for its stETH token. Rocket Pool is more decentralized but smaller. The thing to understand: when you "stake ETH" through these protocols, you are not literally locking up your ETH and waiting. You are receiving a liquid token (stETH, rETH) that represents your stake plus rewards and can be used or traded immediately. This unlocks composability with the rest of DeFi but adds a layer of smart-contract risk.
5. Eigenlayer (the leading restaking protocol)
The newest category of yield-bearing staking products.
Deven's take. Park this as further reading for now. We will not be advising you to use restaking in this course. The category is too new and the risks are layered in ways most retail users do not yet understand. But you should know it exists, because it is one of the more interesting structural innovations of the last two years, and because in the next year or two restaking will be a meaningful component of the yield landscape whether you participate or not.
6. Anchor / Celsius / Voyager retrospectives (multiple sources)
Case studies in unsustainable yield.
Deven's take. Read at least one in-depth piece on each. The pattern is consistent across all three. Yields advertised in the 8-20% range. Opaque on where the yields were actually coming from. Heavy retail marketing. Rapid growth. Sudden collapse. The lesson is universal and worth internalizing as a permanent filter: if you cannot trace the yield to a specific real economic activity, the product is either taking on hidden risk or is structurally a Ponzi. There is no third option.
Tomorrow
The crypto asset zoo. Coins, tokens, NFTs. What the differences actually are, why the distinctions matter (legally, practically, philosophically), and how to think about the dozens of token categories without getting lost. By the end of tomorrow you will be able to look at any new crypto project and place it in a recognizable category.
See you in the morning.
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