Web3 Fundamentals: From Ledgers to Wallets
This introduction organizes the basic concepts in the official glossary across three layers—blockchains, wallets, and applications—to help beginners understand the relationships among public records, asset control, and protocol interactions.
Ledgers, Nodes, and Consensus
A blockchain organizes a digital ledger into a sequence of connected blocks, while nodes participate in synchronizing data and validating transactions. Public blockchains allow participants to view records and collectively maintain the ledger according to network rules. Understanding these concepts helps distinguish the network, the assets recorded on the network, and the applications that connect to the network, avoiding the misconception that assets are actually stored in the wallet interface.
The Roles of Wallets and Keys
Wallets help users manage accounts and interaction permissions, while private keys and recovery seed phrases are related to control over assets and should be kept strictly confidential. Hardware wallets can provide dedicated devices for key protection, while self-custodial wallets place users directly in charge of safeguarding their assets. The glossary also introduces block explorers, which users can use to view public records by address or transaction information.
Applications, Protocols, and Digital Assets
Smart contracts are programs deployed on blockchains, and decentralized applications provide entry points for interacting with these programs. DeFi encompasses activities such as lending and token swaps,NFT emphasizing the uniqueness of different tokens, while stablecoins attempt to remain pegged to a reference asset. Understanding definitions is the starting point for identifying product structures; the terms themselves should not be treated as promises of value or security.
Original Tutorial
https://learn.metamask.io/zh-CN/glossary
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