9 notes in this chapter

Blockchain and Web3 Terms MOC

9 terms across 3 categories. This is the concept layer behind the Solidity language note already in Programming Languages — Solidity is how you write a smart contract, this folder covers what a smart contract actually is and what it can build.

Core Concepts

• Blockchain
• Wallet
• Gas Fees

Consensus

• Proof of Work vs Proof of Stake
• Layer 2 Scaling

Applications

• Smart Contract
• NFT (Non-Fungible Token)
• DeFi (Decentralized Finance)
• DAO (Decentralized Autonomous Organization)

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How to use this

Read Core Concepts first, they’re prerequisites for everything else. Proof of Work vs Proof of Stake connects directly to Distributed Consensus in System Design — the same underlying problem, applied to a trustless, permissionless network instead of a company’s own servers.

Suggested order if starting from zero

1. Blockchain → Wallet → Gas Fees — how the base layer works and what it costs to use
2. Proof of Work vs Proof of Stake — how the network agrees on truth without a central authority
3. Smart Contract — the building block everything else is made of
4. NFT, DeFi, DAO — the three major application categories built on smart contracts
5. Layer 2 Scaling — the practical fix for gas fees and throughput, once the fundamentals click