Quantum Computers are 1M x too small to hack Bitcoin/SHA-256

  • So that's notionally 40 years under Moore's law. There are a lot of unknowns obviously, bit that's still a lot more concerning than the naive calculatikn that says there isn't enough energy in the universe to try enough inputs to find a collision. It will be interesting to see if / how this gets revised down in the future

  • Bitcoin relies on the security of ECC too. Doesn't that take way fewer qubits to break?