Gonna be reading this one soon insha Allah.

It's interesting that this Shaykh was able to articulate the Riba problem in fiat so well, and well before bitcoin was a thing. There's lots we can learn from him and his teachings.

As far as I'm aware, the Shaykh did not comment on bitcoin as he passed away shortly after it was discovered. But I believe the authors, being gold bugs, don't look at Bitcoin favorably.