# Web3 & DeFi Basics #2: Understanding Blockchain and Layers (L1 & L2) *Unlocking the Future of Blockchain: Essential Insights into Layer 1 and Layer 2* By [The DeFi Stack](https://paragraph.com/@thedefistack) · 2025-03-21 blockchain, bitcoin, ethereum, solana, layer 1, layer 2, web3 --- ### ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f310.png) Introduction: Quick Recap on Blockchain Blockchain technology is at the heart of Web3, providing secure and decentralized data storage without central authorities. [More on Web3 & DeFi Basics #1](https://paragraph.xyz/@thedefistack/web3-and-defi-basics-1) ### ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f4cc.png) Major Blockchain Projects: **1\. Bitcoin (BTC): Digital Gold** Bitcoin, created in 2008 by the mysterious Satoshi Nakamoto, aims to be decentralized digital money. It's commonly viewed as digital gold, an inflation-resistant asset and peer-to-peer currency. * **Use Cases:** Savings, global transfers, digital asset. * **How it works:** Proof of Work (miners solving puzzles). * **Adoption:** El Salvador’s legal tender, Tesla and MicroStrategy investments, largest crypto by market capitalization ([Investopedia](https://www.investopedia.com/terms/b/bitcoin.asp)). **2\. Ethereum (ETH): The World Computer** Ethereum allows developers to build decentralized apps (dApps) and smart contracts. Known as the "world computer," it's central to DeFi and NFT ecosystems. * **Use Cases:** DeFi, NFTs, DAOs. * **How it works:** Proof of Stake since 2022. * **Adoption:** Dominant platform for DeFi (70%) and NFTs (50%) ([Ethereum.org](https://ethereum.org/en/whitepaper/)). **3\. Solana (SOL): High-Speed Blockchain** Launched in 2020, Solana focuses on fast, affordable blockchain transactions suitable for DeFi, NFTs, and gaming. * **Use Cases:** DeFi, NFT marketplaces. * **How it works:** Combines Proof of History and Proof of Stake. * **Adoption:** Growing ecosystem, low fees (~$0.01 per transaction) ([Solana](https://solana.com/news/proof-of-history)). ![](https://paragraph.xyz/editor/callout/tip-icon.png) ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f517.png) **Interoperability:** Allows blockchains like Bitcoin, Ethereum, and Solana to communicate, exchanging assets and data (via solutions like Cosmos, Polkadot, Wormhole) ([Messari](https://messari.io/report/chain-abstraction)). ### ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f9f1.png) Blockchain Layers Explained: **Layer 1 (L1): The Base Layer** L1 blockchains like Bitcoin, Ethereum, and Solana independently secure and validate transactions but face scalability challenges. * **Strengths:** Secure, decentralized. * **Limitations:** Slow transactions, high fees during peak times (e.g., Ethereum ~15 TPS, Bitcoin ~7 TPS) ([Investopedia](https://www.investopedia.com/what-are-layer-1-and-layer-2-blockchain-scaling-solutions-7104877)). **Why Create Layer 2?** Layer 2 blockchains directly address Layer 1's limitations, primarily scalability and cost, by building atop existing L1 infrastructure. For example, "Base" is a Layer 2 built specifically on Ethereum, inheriting Ethereum's security and decentralization while significantly improving transaction speed and reducing costs. L2 solutions like Base offer not only a more efficient way to transact but also enable new functionalities and use-cases not feasible directly on Ethereum due to its limitations in speed or transaction costs ([Ethereum.org](https://ethereum.org/en/layer-2/)). **Layer 2 (L2): Boosting Scalability** L2 blockchains sit atop L1 networks, batching transactions off-chain to speed up and reduce transaction costs without sacrificing security. * **Examples:** Arbitrum, Optimism, Base (Coinbase-backed). * **Benefits:** Lower fees (<$0.10), rapid transactions (seconds), leveraging L1 security ([Ethereum.org](https://ethereum.org/en/layer-2/)). ![](https://paragraph.xyz/editor/callout/tip-icon.png) **Interaction between L1 & L2:** L2 executes transactions quickly, summarizing data periodically back to L1 for final validation, balancing speed (L2) with security (L1). ### ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f3af.png) Conclusion: Why It Matters Understanding Bitcoin, Ethereum, Solana, and blockchain layers (L1/L2) equips you to navigate the rapidly evolving Web3 landscape. Scalability and interoperability developments continue making blockchain faster, cheaper, and more accessible. [Subscribe](https://paragraph.xyz/@thedefistack/memberships) * * * [ The DeFi Stack -------------- Demystifying Decentralized Finance, one protocol at a time. Simple explanations, deep insights, always reliable. Subscribe to our decentralized newsletter https://bento.me ![](https://storage.googleapis.com/papyrus_images/1b2f11adfd3e204e613a3b437998e5e5.png) ](https://bento.me/thedefistack) ### ![](https://cdn.jsdelivr.net/npm/emoji-datasource-apple/img/apple/64/1f517.png) **Sources & Further Reading:** * [Web3 & DeFi Basics #1](https://paragraph.xyz/@thedefistack/web3-and-defi-basics-1) * [Bitcoin Whitepaper](https://bitcoin.org/bitcoin.pdf) * [Ethereum Whitepaper](https://ethereum.org/en/whitepaper/) * [Solana Proof of History](https://solana.com/news/proof-of-history) * [Investopedia - Layer 1 vs Layer 2](https://www.investopedia.com/what-are-layer-1-and-layer-2-blockchain-scaling-solutions-7104877) * [Ethereum Layer 2 Overview](https://ethereum.org/en/layer-2/) * [Messari Interoperability Report](https://messari.io/report/chain-abstraction) --- *Originally published on [The DeFi Stack](https://paragraph.com/@thedefistack/web3-and-defi-basics-2)*