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The Bitcoin Blockchain and Quantum Computing



The Bitcoin Blockchain and Quantum Computing

The ability of quantum computers to overcome the mathematical complexity that underlies the majority of currently employed encryption is one of its most well-known uses.

This article seeks to provide a fair assessment of the risks that quantum computers bring to Bitcoin.

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Cryptography and Quantum Computing

A private-public key pair is created in asymmetric cryptography such that the two keys are mathematically related to one another.

The private key is kept private, as the name implies, although the public key is released publicly to the whole public.

This enables someone to create a digital signature using their private key, which anybody with the associated public key may then verify.

In the financial sector, this approach is usually used to demonstrate the legitimacy as well as reliability of transactions.

A mathematical concept known as a “one-way function” serves as the foundation for asymmetric cryptography’s security.

According to this rule, the private key can be simply converted into the public key, instead of the other way.

It would take an excessively long time to complete all existing algorithms to generate the private key out from the public key, making them all impractical.


Let us first quickly recap how Bitcoin transactions function in order to better appreciate the implications of quantum computers for cryptocurrency. In order to transfer money, Bitcoin uses a decentralized system.

A Bitcoin user is in charge of creating his own random address, however unlike the banking system where banks are responsible for giving users bank accounts.

The user’s computer uses a straightforward process to determine a random Bitcoin address which is associated with the public key and the secret key which is known as the private key is needed to execute transactions.

A transaction occurs when Bitcoins are transferred from one address to another. A similar transaction would be making a transfer of funds between accounts.

In order to complete a Bitcoin transaction, the sender is required to sign it with a digital signature proving they are the owner of the address where the money is kept.

The so-called “miners” in the Bitcoin network are ultimately responsible for choosing which transactions to allow into the network.

The next group of transactions, known as a block, is processed in a race among miners.

The person who finishes first in the race can build the following block, earning fresh coins in the process. Using a sequential connection, bitcoin blocks are connected to one another.

They combine to create the “blockchain,” which is a chain of blocks.

Any transaction may be included in the next block that is successfully mined by the winning miner.

By placing more blocks on top of those already there, other miners can show their support.

They will construct on the most recent block that has been agreed upon if there is a disagreement.

To put it another way, if a malicious miner makes an effort to create an inaccurate block, honest miners will disregard the attempt and continue to mine the most recent legitimate block.

How One Can Protect Bitcoin From Being Stolen By An Adversary?

Since their public keys have not yet been made public, p2pkh addresses which have not previously been exploited to transfer Bitcoins are secure.

This indicates that your Bitcoins should not be susceptible to a quantum attack if you move them to a new p2pkh address.


The safety of the Bitcoin network is under threat from quantum computers. Approximately 25% of the Bitcoins now in circulation, as previously mentioned, are susceptible to a quantum attack.

You should probably move your Bitcoins to a new p2p address if you have them at a susceptible address and think quantum computing has advanced more than is generally acknowledged.

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