Attendee Question: There is an unlimited amount of prime numbers, a quantum computer would be able to find the next number, making bitcoin analogous to striking gold (creating new money out of nothing).
Answer (Toufi Saliba & Adam Gravitis): Many cryptosystems today that protect trillions of dollars of property are, in theory, vulnerable to an attack made by a sufficiently large quantum computer. It remains unclear how practical quantum computers will be ready for this task, or when such an attack might become practical. Dismissing any technology on the basis that it might, in theory, have quantum-related vulnerabilities seems at this point rather premature. There are a lot of work being done for Quantum proofing for blockchains and other systems. however they are theoretical and can only be tested by simulations, so you never know with 100% certainty until then, but you could mitigate to a very high degree of certainty and that is being done. More work can certainly be appreciated.