Resources.

Interactive worksheet from Chapter 17. Answers never leave your browser; URL-encoded state, no backend.

Plain-language reference for the framework used throughout the book. Cross-linked to relevant chapters.

Books, papers, podcasts, and conferences worth your time. Categorized. Added to over time.

272 wallets, hardware, and services scored by Dave Bradley at coinbeast.com. Live June 25 at Bitcoin Rodeo.

Personal Introduction, chapter openings, conclusion — rendered as web prose. No gating.

Every threat and control update, opt-in via feed.xml.

Reader-reported corrections to the book, by edition and printing.

For responsible disclosure on errata and code-example issues.