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What will happen once a sufficiently powerful quantum computer is invented?

the same things that were going to happen anyway, but faster
also, some people (not you or me) will think hard about how certain problems become tractable on quantum computers, e.g. efficient factorization of large integers via Shor's algorithm, and the applications those things have to fields like cryptography 
^oi genius, he meant that breaking the code will become elementary and people with these computers can easily find every user's code and steal their bitcoins. But note that the same can be said about online banking. That being said, bitcoin codes are based on an extremely nonlinear hash (where there are zero hopes of even approximating it) and on an extremely cumbersome guess and verify algorithm that there would be no hope for a quantum computer to crack the codes faster than our current tech. Quantum computers will easily break through all these regular online encryption techs used for secure transactions but they stand no chance in breaking a one of these hash codes unless there is a secret mathematical formula behind the creation of the hash.

^oi genius, he meant that breaking the code will become elementary and people with these computers can easily find every user's code and steal their bitcoins. But note that the same can be said about online banking. That being said, bitcoin codes are based on an extremely nonlinear hash (where there are zero hopes of even approximating it) and on an extremely cumbersome guess and verify algorithm that there would be no hope for a quantum computer to crack the codes faster than our current tech. Quantum computers will easily break through all these regular online encryption techs used for secure transactions but they stand no chance in breaking a one of these hash codes unless there is a secret mathematical formula behind the creation of the hash.
No, quantum encryption is simply superior tech to blockchain and will make blockchain redundant.

Structural estimation of highly nonlinear equations with higher dimension integrals that are currently computationally infeasible and cannot be bootstrapped or simulated. Curse of dimensionality no longer a hurdle; forget about splines and just kernel estimate all nonparametric problems. Brute force search everything.

^oi genius, he meant that breaking the code will become elementary and people with these computers can easily find every user's code and steal their bitcoins. But note that the same can be said about online banking. That being said, bitcoin codes are based on an extremely nonlinear hash (where there are zero hopes of even approximating it) and on an extremely cumbersome guess and verify algorithm that there would be no hope for a quantum computer to crack the codes faster than our current tech. Quantum computers will easily break through all these regular online encryption techs used for secure transactions but they stand no chance in breaking a one of these hash codes unless there is a secret mathematical formula behind the creation of the hash.
No, quantum encryption is simply superior tech to blockchain and will make blockchain redundant.
lol, you don't even know the difference between encryption and blockchain...

^oi genius, he meant that breaking the code will become elementary and people with these computers can easily find every user's code and steal their bitcoins. But note that the same can be said about online banking. That being said, bitcoin codes are based on an extremely nonlinear hash (where there are zero hopes of even approximating it) and on an extremely cumbersome guess and verify algorithm that there would be no hope for a quantum computer to crack the codes faster than our current tech. Quantum computers will easily break through all these regular online encryption techs used for secure transactions but they stand no chance in breaking a one of these hash codes unless there is a secret mathematical formula behind the creation of the hash.
No, quantum encryption is simply superior tech to blockchain and will make blockchain redundant.
lol, you don't even know the difference between encryption and blockchain...
and you don't even understand the comment.