Key Points - In the future, quantum computers could become powerful enough to break Bitcoin's encryption. - According to Google's quantum computing research unit, as much as one-third of all Bitcoin might be at risk. - A new consortium of tech and crypto companies is now working to prepare Bitcoin for the quantum computing era. CNBC Mad Money host Jim Cramer is selling his Bitcoin(CRYPTO: BTC), but not for the reason you might think. He's not dumping crypto for artificial intelligence stocks in search of higher returns, as many investors are now doing. Instead, Jim Cramer is selling his Bitcoin because he's worried about the "quantum threat." In short, he's concerned that super-powerful quantum computers will soon be able to crack Bitcoin's cryptography, potentially leading to hundreds of billions of dollars in losses for crypto investors. Missed Nvidia in 2009? This Rare Signal Is Flashing Again.In 2009, a "Double Down" signal flashed for a little-known chipmaker called Nvidia. For the first time in years, that same "Total Conviction" signal is flashing for a company 1/100th the size of Nvidia. Continue » How real is the "quantum threat"? Cryptocurrencies are valuable for the cryptographic encryption they provide. If that encryption is ever put at risk, it could lead to a crisis of investor confidence. That's why the so-called "quantum threat" posed by quantum computers has been percolating around Bitcoin for nearly a decade now. The good news is that today's computers, no matter how powerful they are, have no realistic chances of breaking Bitcoin's encryption. But what about tomorrow's computers? That's what has Jim Cramer worried. Earlier this year, the quantum computing research unit at Alphabet (NASDAQ: GOOG)(NASDAQ: GOOGL) made headlines when it suggested that Bitcoin might be at much more risk than ever suspected. As much as one-third of all