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Is bitcoin really safe? I actually generated a private key that is the same as others.

Source: Internet
Author: User
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The length of the private key of Bitcoin is 256 bits. In theory, there is a 256 power case. This is a very large number. The number of atoms in the scientific research universe is about 80 power of 10, the second power of 2 is about 77 to the power of 10. Therefore, when a private key is randomly generated, the probability of repetition is quite small, which is also the guarantee of Bitcoin Security. Although the probability is small, it will still appear. Today I met it.

Today, the program generates a random private key to generate a bitcoin test link address for testing in the program. I obtained 0.0081 BTC from the test currency website and went to the blockchain browser to check it. The magic scene showed that this address had already recorded transactions in 2017.
The test url I generated is mt4nzc2zz6nnuly9ispjcyaywmlwox9jwt.
Blockchain browser link: https://testnet.blockchain.info/address/mt4Nzc2Zz6nnULY9iSPJcyAYwmLwoX9jwt

Images and truth

It indicates that someone generated the same address with me using the same private key in 2017. We know that the bitcoin in the address is owned with the private key, although this is only an address on the test chain, although we know that the probability of repetition is very small, but today it does happen, is bitcoin really safe?

Is bitcoin really safe? I actually generated a private key that is the same as others.

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