Welcome back to the r/CryptoCurrency Academy.
One of the biggest criticisms of some cryptocurrencies is that they can be slow and expensive. If you try to use a major blockchain during busy periods, fees can skyrocket, making small purchases difficult.
If crypto is to handle global finance – buying coffee, trading stocks, and running apps – it needs to process millions of transactions per second.
One of the industry’s solution to this is a technology called Layer 2.
The Problem: The Blockchain TrilemmaTo understand why blockchains can be slow, one must understand the Blockchain Trilemma. In computer science, some people believe a blockchain can only prioritize two of the following three features:
Decentralization: No single entity controls the network. Security: The network is immutable and resistant to attacks. Scalability (Speed): The network can handle massive transaction volume cheaply.Major blockchains (Layer 1) prioritized Decentralization and Security.
They are designed to be secure digital vaults. To achieve this, every node in the network verifies every transaction.
This makes them secure, but inherently slow.
One Solution: Layer 2Developers realized that trying to make the main blockchain faster often compromised security.
Instead, they decided to stop processing every single transaction on the main chain.
They built a secondary framework on top of the main blockchain.
Layer 1 (The Settlement Layer): This is the main blockchain (e.g., Ethereum). Its only job is to be the ultimate source of truth and security. Layer 2 (The Execution Layer): This is where some transactions can happen. It is designed for speed and low cost. How it Works: The “Bar Tab” ModelThe simplest way to understand the relationship between Layer 1 and Layer 2 is the concept of a Bar Tab.
Layer 1 Transaction: Paying for every single drink individually with a credit or gift card is slow and incurs a transaction fee every time. Layer 2 Transaction: Opening a tab. The bartender records your drinks on a notepad. You get your drinks instantly, and there is no bank transaction fee for each order. Settlement: At the end of the night, you pay the total sum once on the main register.Some Layer 2 networks work similarly. They process thousands of transactions externally, then bundle them up and submit a single proof to the main blockchain to be “settled.”
Rollups: Bundling for EfficiencyOne of the primary technologies used is called a Rollup.
A Rollup “rolls up” thousands of individual transfers into a single packet of data. The Layer 2 network executes these transactions and simply posts the final result to Layer 1.
Because the expensive transaction fee on Layer 1 is split among thousands of users in the bundle, the individual cost for each user becomes fractions of a penny.
The Trade-offIf Layer 2 is faster, why do we need Layer 1?
Layer 1 remains the anchor. It provides the security and the final settlement.
Layer 2 networks are faster but rely on Layer 1 to finalize their data. If the Layer 1 blockchain disappeared, the Layer 2 network would lose its security guarantee.
For the end user, this means you can enjoy the speed of a modern app with the security of a decentralized blockchain running in the background.
Layers and LayersYou can build Layer 2, Layer 3, Layer n basically.
An example of Layer 3 would be a bar tab being divided further between many people. And then you can build a credit and debt system for people sharing the tab. And so on.
Some people believe that Layer 1 can eventually be optimized for anything, making Layer 2s unnecessary. However, as of this day and age, Layer 2s remain an important historical aspect of crypto, worth learning about on this Educational Series.
Summary Layer 1 is the Main Blockchain, usually used for Settlement. It can be slow, expensive, and hyper-secure. Layer 2 is anything built on top of the Main Blockchain. It can be faster, cheaper, and may handle more volume. Rollups bundle thousands of transactions and settle them as one. Layer Scaling means using Layers to improve blockchains like with Rollups or using other methods. There are, of course, many other ways to scale blockchains, including just improving Layer 1 cryptos.Now that we know all about:
Pure CryptoCurrencies like Bitcoin and also Other Pure CryptoCurrencies Protocols like Ethereum Tokens And now, Layer 2s.It’s time to learn about a few other types of CryptoAssets.
For example, what if you don’t want a public ledger at all?
That is the subject of Lesson 8: Private Chains.
See you then.
r/CryptoCurrency Academy Syllabus:
Course 1: The History of CryptoCurrency Lesson 1: What is CryptoCurrency after all? The Bitcoin Story Lesson 2: The Evolution of Money (Debt, Barter, Gold, Fiat, and Crypto) Lesson 3: How a Blockchain Works (The “Public Ledger” Explained) Lesson 4: Other CryptoCurrencies Course 2: Types of CryptoAssets Lesson 5: The World Computer, Ethereum, and other Smart-Contract Cryptos (Protocols) Lesson 6: Tokens Lesson 7: Crypto Layer 2 and Scaling (You Are Here) Lesson 8: Private Chains (Next Lesson) Lesson 9: Types of CryptoAssets (Classification) Course 3: CryptoAsset Tools and Finance Lesson 10: Common Crypto Mistakes and How to Spot Scams Lesson 11: Educational How to Buy CryptoAssets. Centralized Exchanges (CEX) and Decentralized Exchanges (DEX) Lesson 12: Wallets & Keys (Hot vs. Cold Storage) Lesson 13: Transactions (Gas Fees, Mempools, and Block Explorers) Course 4: CryptoAssets and the Smart Economy Lesson 14: Introduction to DeFi (Decentralized Finance) Lesson 15: NFTs: Beyond the JPEGs (Digital Identity and Ownership) Lesson 16: Real World Assets (RWA) & Tokenization Lesson 17: The Banking System with Stablecoins & CBDCs Course 5: CryptoAssets and the Law Lesson 18: Smart Contracts and Legal Validity Lesson 19: Oracles & The Law Lesson 20: Digital Evidence & Chain of Custody (What happens when things go wrong?) Course 6: The Frontier Tech of CryptoAssets Lesson 21: Proof of Work vs. Proof of Stake (Miners vs. Validators) Lesson 22: Layer 2 Solutions (Scaling) Lesson 23: Algorithms trading and AI agents Lesson 24: The Metaverse Course 7: Crypto Institutions (Governance & Compliance) Lesson 25: Corporate Structures in Crypto Lesson 26: What are rCryptoCurrency Moons? Lesson 27: DAOs and The rCyptoCurrency Non-Profit Model Lesson 28: The FutureDisclaimer: This content is for educational purposes only and does not constitute financial or investment advice. The technology described involves risks. Never invest money you cannot afford to lose.
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