Quantum computers aren’t being created for the sole purpose of cracking Bitcoin, it just makes a good headline to assume that might be on their to-do list. Some analysts believe that the most plausible scenario for a quantum attack is to harvest encrypted data now, essentially doing the groundwork ready when and if enough qubits are lined up. Their research worked on the assumption that the largest current quantum computer, IBM’s Eagle processor, currently contains 127 superconducting qubits. Th