Blockchain & Distributed Ledger Fundamentals

What a blockchain actually is — a replicated, append-only ledger, and why that structure trades off against a conventional database.

Read

45 min

Practice MCQs

25

Interview QA

25

Edition

v3

Editorial status

Reviewed

Relevant for

Blockchain Developer

Scope: NISTIR 8202; Bitcoin white paper; Ethereum developer documentation and proof-of-stake behavior reviewed 2026-09-04; Hyperledger Fabric latest documentation; IPFS documentation reviewed 2026-09-04.