The United States puts 215 million dollars on the table to accelerate the development of fault-tolerant quantum computers. The Department of Energy's goal is to demonstrate machines with hundreds of logical qubits by 2028. For Bitcoin, the news deserves attention. A sufficiently powerful quantum machine could one day attack the signatures that protect certain bitcoin. And this week, an Ethereum researcher added another concern: AI could accelerate the threat even before the arrival of the famous "Q-Day".