Your course [about bitcoin] is phenomenal at explaining everything in plain English.

Latest work

Learning Bitcoin and Other Cryptocurrencies (2018)

A ground-up rewrite of my highly successful 2014 course, Learning Bitcoin. Available on LinkedIn LearningĀ and by subscription through Lynda.com. (Watch it for free.) The new version includes information about Ethereum, Ripple, IOTA, and ICOs. Descripti …

Presentation/Video for LinkedIn, lynda.com

Blog posts

How Hurricane Irma exposed a fundamental Bitcoin weakness

13 September 2017


Digital assets are incredibly fragile.

Yesterday I got an email that said all my bitcoin was about to disappear. Hurricane Irma, it claimed, had damaged …

Is bitcoin the “currency of criminals”? Numbers tell the tale.

8 June 2017


Last week you made this article one of the most popular of my career, currently topping 2,600 Likes. It rebuts …

No, THIS is what bitcoin is, really: Four ways Greg Leffler is wrong, wrong, wrong

1 June 2017


Money is more than things you can hold.

With bitcoin topping an unprecedented $2,400, LinkedIn Senior Software Editor Greg Leffler called bitcoin “the currency of criminals” in his …