Re: What are the biggestest threats to Bitcoin?

Quantum computers? Bugs in the code? Centralized mining?

IIRC, quantum computing can only bring 256-bit bitcoin private key to be "as safe as" 128-bit.

There are many different wallet clients out there, and people are using different versions. Bugs in the code may affect some people, but probably not for the majority.

I think centralized mining could be a big problem, especially if we have some "bad" big miners trying to double-spend their own transactions.

Can anyone confirm or share info on the quantum computing part?

I can't but I can say that if quantum computing became a credible threat to Bitcoin it would also be a threat to all online commerce. The quantum computing argument is a bit like saying "a global nuclear war would bring down every node!" It's true, but misses the point that we would no longer care.