Blockchain basics

Blockchain basics opens with the anatomy of a block: header, transactions, and a cryptographic hash that seals the contents. You will see how each new block references the hash of the previous one, creating a linked chain that resists retroactive edits. Diagrams walk through nonce searches and proof-of-work timing so you can follow the math without needing advanced code skills. We then explore consensus models such as proof-of-work, proof-of-stake, and delegated proof schemes. Each model is compared on energy cost, security assumptions, and speed, with table snapshots for fast scanning. Public versus private networks, forks, and finality questions close the section, giving you a solid base before reading trading or DeFi guides.