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Lets say one big company or country start a war against bitcoin and they have very powerful machines. What happens if they starts to create public key all the time? Is it possible to finish all the public keys?

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Yes, in theory but it would take so long that neither you, nor I will still be alive by a long shot.

At about 10,000 key pairs per second, with an address space of 2^160, it would take you 50 tredecillion years to finish.

Thats 50,000,000,000,000,000,000,000,000,000,000,000,000,000,000 years To put that into perspective, the age of the universe is about 13,000,000,000 years

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yes, it will just take more energy, than the sun can currently provide :-) Or otherwise: how to store 2^160 addresses... Here is a discussion on bitcoin forum:

https://bitcointalk.org/index.php?topic=1164265.0

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This is technically impossible and economically illogical. If you could check this many addresses, you could also mine bitcoins.

Here are a couple of fun vids:

Bitcoin 101 - Quindecillions & The Amazing Math Of Bitcoin's Private Keys

Ever wonder how Bitcoin (and other cryptocurrencies) actually work?

Both discuss the 'size' of the bitcoin address space.

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