Crypto 101: What Is DeFi, Layer 2, and a DAO -- And Why Should You Care?
This is Part Two of a four-part explainer series. In Part One we covered Bitcoin, blockchain, miners, and where your money actually goes when you buy crypto. Start there.
In Part One you learned that Bitcoin is digital gold -- scarce, finite, and designed primarily to hold value. And you learned that Ethereum is different. It has no hard supply cap and was not built primarily as a store of value.
But that raises an obvious question. If Ethereum isn’t just digital gold, what is it?
The answer is the key to understanding everything people are building in crypto right now. And it comes down to one word.
Programmable.
Bitcoin you can buy, hold, and send. That’s it. It does not do anything else.
Ethereum is programmable money. Developers can write code that lives directly on the Ethereum blockchain and executes automatically -- without a company running it, without a person approving it, and without anyone being able to stop it once it is deployed.
That code is called a smart contract.
Think of a vending machine. You put in money, select your item, the machine dispenses it. No shopkeeper involved. No discretion. No closing time. The rules are built into the machine and they execute every time without fail.
A smart contract works the same way. You meet the conditions -- provide the collateral, send the payment, hold the required token -- and the contract executes. Automatically. On a blockchain visible to anyone in the world.
Once developers realized they could write financial rules directly into software, a natural question emerged: if code can move money automatically, could it also replace some of the functions performed by banks, brokers, and exchanges?
That is what people are building. And before any of it could work at scale, they had to solve one problem first.
Layer 2: Before you can build, you need roads that work
Ethereum is powerful. But in its original form it has a serious practical problem. It is slow and expensive.
The Ethereum network in its base form processes roughly 15 to 30 transactions per second. Visa processes around 24,000. When the network gets congested -- during a popular token launch, a market crash, or simply a busy period -- transaction fees spike sharply. Sending $20 worth of Ether can cost more in fees than the transaction itself is worth.
You cannot build a global financial system on infrastructure that charges more in fees than a Western Union transfer and takes longer than a credit card payment.
Layer 2 networks solve this. They are built on top of Ethereum -- hence the name -- and handle transactions faster and cheaper by processing them away from the main chain and only settling the final result on it periodically. Think of it like a bar tab. You don’t pay after every drink. You run a tab and settle once at the end of the night. The Ethereum main chain is the final settlement. Layer 2 is everything that happens in between.
The human reality of why this matters is not abstract. The World Bank puts the global average cost of sending remittances at 6.36% of the amount sent. Layer 2 networks can reduce that cost to fractions of a cent and settle the transaction in seconds.
That is not a technical upgrade. That is a question about who gets to keep more of what they earn.
Layer 2 made Ethereum usable. Which meant people could finally build on top of it. And the first thing they built was a bank.
DeFi: A bank without bankers
Once developers realized they could write financial rules directly into software, a natural question emerged: if code can move money automatically, could it also replace some of the functions performed by banks, brokers, and exchanges?
The answer they built is called DeFi.
DeFi stands for decentralized finance. It is the umbrella term for financial services -- lending, borrowing, earning interest, trading assets -- that run on blockchain networks through smart contracts, with no bank, no broker, and no loan officer anywhere in the process.
Here is what that looks like in practice. You want to borrow money. In traditional finance you go to a bank. The bank checks your credit history, your income, your collateral. A loan officer makes a judgment call. The process takes days or weeks and the answer is often no.
In DeFi you go to a protocol. You provide collateral -- typically crypto assets. The smart contract checks whether your collateral meets the required threshold. If it does, funds are released instantly. No application form. No credit check. No branch visit. No human discretion. The contract either executes or it doesn’t, based entirely on the conditions you meet.
Nigeria’s micro, small, and medium enterprises account for most businesses and nearly half of GDP yet face longstanding barriers to formal finance. A market trader in Lagos with a thriving cash business but no formal credit history, no payslips, no collateral that a Nigerian bank will accept -- she cannot walk into a branch and get a working capital loan. A DeFi protocol does not care about her credit history. It cares only about what she can put up as collateral.
That sounds like a solution. And sometimes it genuinely is.
But here is what the promise does not tell you. Smart contracts are only as good as the code that writes them. And code has vulnerabilities. In 2025 alone there were 200 reported DeFi protocol hacks resulting in $2.9 billion in losses -- a 40% increase on the year before. Some of these protocols had been audited by professional security firms. They were exploited anyway. Through vulnerabilities nobody anticipated. Through attack vectors that only became apparent once real money was at stake.
And when something goes wrong in DeFi there is no customer service number to call. No regulator to file a complaint with. No deposit insurance. The contract executed exactly as written. The fact that it was written with a flaw that someone exploited is, from the protocol’s perspective, not its problem.
The promise of DeFi is banking without gatekeepers. But most DeFi lending requires borrowers to already own assets worth more than they want to borrow. Which means the Lagos trader -- the person the promise was made for -- remains largely outside the system for now.
And even if the technology worked perfectly for everyone, another question immediately emerges. Who gets to decide the rules? What qualifies as acceptable collateral. How fees are set. What happens when market conditions change and the protocol needs to adapt.
Remove the bank and you remove the loan officer. But you also remove the board, the risk committee, and the regulator. Someone still has to fill that space. In DeFi, that someone is supposed to be everyone.
DAOs: When the community becomes the board
Imagine owning shares in a company where every shareholder votes on every significant decision. Which products to build. Which investments to make. What fees to charge. The more shares you own, the more votes you have. No board making decisions behind closed doors. No CEO whose priorities you never see. Just transparent collective governance where your stake gives you a direct voice.
That is not a hypothetical. It is what governance tokens are designed to do. And it is exactly what attracted millions of people to DAOs -- Decentralized Autonomous Organizations -- in the first place.
Proponents call it governing without governments. What it actually looks like is governing instead of institutions -- with all the promise and all the problems that implies.
MakerDAO -- now rebranded as Sky, and one of the largest and longest running DeFi protocols -- has done this at real scale. In 2024 it launched a public process to allocate $1 billion toward tokenized US Treasury products. The final allocation to BlackRock, Superstate, and Centrifuge required approval by token holders. The entire process was conducted publicly. Any token holder could review the proposals, follow the evaluation, and vote on the final allocation.
In traditional finance that decision would have happened in a boardroom. You would have read about it in a press release afterwards.
And this is where the ideal collides with reality.
Voting power is proportional to token holdings. One token, one vote. Which means the people with the most tokens hold the most votes. And the people with the most tokens are almost always the early investors and founders who acquired them cheapest, before the protocol had any meaningful value.
The system designed to democratize finance can end up reproducing one of finance’s oldest problems. Power concentrates in the hands of those who got there first and paid the least.
DAOs have funded open source infrastructure, managed shared treasuries worth hundreds of millions of dollars, and governed significant financial protocols transparently. They have also been paralyzed by voter apathy when most token holders simply do not participate, and influenced heavily by large holders whose interests may not align with the broader community.
The question a DAO forces into the open is one political philosophy has wrestled with for centuries. Who should have power, and what prevents them from abusing it?
Blockchains can change how decisions are made. They cannot eliminate the underlying question of who gets to make them.
So should you care?
Yes. But not necessarily for the reasons the crypto industry would give you.
You should care because Layer 2 networks, DeFi protocols, and DAOs are each attempting to solve problems that traditional finance has genuinely struggled with. Remittance costs that quietly consume the wages of migrant workers. Financial systems that exclude people without formal banking relationships. Governance structures that concentrate decision-making behind closed doors.
These are real problems. The solutions being built are real too -- incomplete, sometimes dangerous, often overhyped, but real.
What began as an experiment among software developers is increasingly intersecting with the financial system itself. Stablecoins are being used for payments. Tokenized Treasury securities are attracting institutional investors. Regulators are writing new rules. Central banks are evaluating the implications for monetary policy, financial stability, and cross-border capital flows.
The conversation is no longer just about crypto.
It is increasingly about finance.
References
World Bank, Remittance Prices Worldwide, September 2025
World Bank, Fostering Inclusive Finance for MSMEs in Nigeria, December 2025
Financial Stability Board, Decentralized Finance: Financial Stability Considerations, 2023
IMF-FSB, G20 Crypto-asset Policy Implementation Roadmap, October 2024
CoinDesk, BlackRock’s BUIDL, Superstate and Centrifuge Win Spark’s $1B Tokenized Asset Windfall, March 2025