Jim Cramer said he's selling all his Bitcoin. The CNBC host cited quantum computing risks after chatting with IBM CEO Arvind Krishna on Mad Money, where Krishna warned that quantum computers could crack cryptocurrency encryption within three to four years.

The move landed exactly where crypto Twitter expected it to land. Traders dusted off the "inverse Cramer" meme, the running joke about how his sell calls historically bottom the market. Bitcoin barely flinched, trading around $63,700 and up roughly 1 percent over the prior day.

The quantum threat is real but not imminent

Whether Cramer's timing matters less than what he's worried about. The potential for quantum computers to break Bitcoin's elliptic curve cryptography has been debated for years among security researchers. The consensus among experts remains clear, though. The threat hasn't materialized yet, and developers have roadmaps to shift Bitcoin toward quantum-resistant algorithms before any actual breach occurs.

Krishna's three to four year window is aggressive compared to most technical assessments. It's also the kind of timeline that can spook investors who don't dig into the specifics, which may explain why Cramer ran with it. The broader crypto community, meanwhile, seems to have already priced in the quantum question as a longer-term engineering problem rather than an immediate existential crisis.

This article is informational only and does not constitute investment advice.