Reading note: BlockDAG vs linear chain

Summary

A BlockDAG allows multiple blocks at the same height to be ordered under consensus rules, using a topological height distinct from plain block height.

Official references:

• BlockDAG feature page
• FAQ

Classroom prompt

What should a wallet UI expose so users understand confirmations on a DAG versus a single-chain model?

Scope

This note summarizes public documentation and is not a consensus specification.