What This Covers

Blockchain fundamentals and practical interaction — the technology, not the speculation.

In scope: Distributed ledgers, consensus, transactions, smart contract interaction, wallets, token standards. Out of scope: Trading strategies, price analysis, specific DeFi protocols, Solidity development (see dedicated skills).

Core Concepts

Concept	One-liner
Distributed ledger	Shared database synchronized across nodes, no single owner
Consensus	How strangers agree on truth without trusting each other
Immutability	Changing history requires re-doing all subsequent work
Smart contract	Code that executes automatically when conditions are met
Gas	Fee paid to network for computation

For mental models and analogies, see concepts.md.