When was the last big spy case? Probably predates the invention of cryptocurrency.
There has been a steady stream of espionage cases in the last few years and along with a couple of 'big' spy cases recently, but they haven't gotten wider notoriety for whatever reason. Maybe they weren't sexy enough? One pretty notable case that was reported on for several years, to include before he was even arrested, was this former CIA case officer who may have been responsible for getting a bunch of CIA assets in China rolled up and killed. They got him for what they could which wasn't as much as they probably wanted to nail him with, likely because he was trained in actual tradecraft and didn't just Google 'how to spy'.