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> 1.) As quantum computing advances, there will be at least one successful 51% attack on a major cryptocurrency.

Is there a quantum solution for one of the popular proof-of-work algorithms?

https://en.bitcoin.it/wiki/Quantum_computing_and_Bitcoin

No, but there is a quantum computer algorithm for classic asymmetric cryptography, which would affect some major proof-of-stake coins if quantum computers ever become practical.

but that wouldn't be a 51% attack, that would just be stealing a wallet

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