if it hasn't already been used to steal ALL block chain material
No need to steal the block chain material.
Just become a node and you have access to all of it to download
Then you can have your magical quantum computer crack all the passwords and encryption and transfer all the amounts to addresses that only you control.
Just one more thing.
Now you just have to convince ten thousand+ other nodes that still have the original blockchain to all switch to your new blockchain with all your changes.
Like anything tied to the internet, crypto is dependent on the electric grid and one EMP or good hack and its all gone. Colour me skeptical.
Not that quantum computing will one day break ALL passwords / algorithms including Block chain in one day.
When quantum becomes ubiquitous everything will change. Not just crypto.
We already have Quantum Computing Resistant algorithms and cryptos with many more under active development.
Also if someday someone finally makes a working practical Quantum Computer It could be used to make a more secure crypto.
Chicken and the egg :
if it hasn't already been used to steal ALL block chain material
No need to steal the block chain material.
Just become a node and you have access to all of it to download
Then you can have your magical quantum computer crack all the passwords and encryption and transfer all the amounts to addresses that only you control.
Just one more thing.
Now you just have to convince ten thousand+ other nodes that still have the original blockchain to all switch to your new blockchain with all your changes.
Nukes will fly if quantum computing ever becomes a thing. Again, another ridiculous argument like the EMP.
yeah those darn conspiracy theories.....
That is, of course, a disconcerting possibility reliant on whether or not said encryption ever gets tangibly updated.
Who even knows where PC components will be in 40 years.
40 years....that's some serious hopium