This is the only public comment Satoshi ever made about quantum computing risk to Bitcoin Back in 2010 a user "llama" asked what would happen if signatures were compromised due to quantum computers and whether it would make BTC worthless "True, if it happened suddenly. If it happens gradually, we can still transition to something stronger. When you run the upgraded software for the first time, it would re-sign all your money with the new stronger algorithm." - satoshi(Luke Martin)