After Google announced the domination of quantum computers overtaking the computing power of supercomputers, the crypto-currency market fell sharply.... This would be due to the logic that quantum computers can penetrate the blockchain's security. If the extremely fast operating speed of the quantum computer is used, it is possible to manipulate the book through the blockchain consensus algorithm in an instant. However, there are many perspectives that the problem will have little impact on the market. This is an analysis that will take a long time to commercialize the quantum computer, which is the first step. In addition, there is an interpretation that the assumption that the encryption of the block chain is broken does not ignore all the financial cryptosystems on the planet. In addition, as quantum computers develop, block chain technology will continue to develop.

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