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How to Prevent Double-Spending Cryptocurrency

There are some electronic errors that may occur when you use a digital system. Double spending is a common issue when it comes to cryptocurrencies and this occurs where the same funds are transferred to two different people simultaneously. This is a challenge with decentralized systems as users may receive funds that have been sent elsewhere. It is important for crypto exchanges to ensure that double spending does not happen. This is the only way that digital currencies would function efficiently.

With so many users to the world of cryptocurrency, it is imperative to become aware of some of the malicious activities in the industry. Many merchants are starting to accept Bitcoin and other cryptocurrencies as a payment option. This is where the greatest risk of double-spending attacks is witnessed. Let us look at this issue in more detail to help you understand it better.

Double-spending in Cryptocurrency

BTC is one of the largest cryptocurrencies on the market in so many ways. The Bitcoin blockchain has put so many measures and checks in place so as to prevent double-spending. When there is a transaction on the blockchain, the recipients have to confirm that the transactions are successful. Once this happens, there is no way for the sender to reverse a transaction that has been confirmed in a blockchain. While reversals may be possible, there will be so much hashing power required, which is almost unrealistic.

Unfortunately, even with these stringent measures in place, there have been a few instances of double-spending attacks. The main intention of these attacks is meant to force parties to accept unconfirmed transactions. Crypto traders on the Yuan Pay Group feel safer as there are additional measures that have been put in place to prevent such attacks. There are several ways through which double-spending attacks are executed and the main ones are:

51% Attacks

Such attacks are possible when there is an entity that has the capacity to control over a 50% hash rate. As such, they are able to modify or exclude the ordering of transactions on a network. Bitcoin seems to have overcome this challenge but there have been several attacks on other networks.

Race Attacks

In this case, there are two competing transactions that are being broadcasted on the network in close succession. The transactions use the same funds and only one of them wins the race and gets confirmed on the block. In this case, the intention of the attacker is to invalidate one transaction and confirm it to his benefit. For instance, a user can buy goods and pay with crypto and then send the same funds to an address that he controls. As such, the merchant will accept the unconfirmed transaction as a successful payment.

Finney Attacks

Lastly, this is an attack where the attacker will pre-mine a transaction and have it on the blockchain while delaying broadcasting it on the network. He will then spend the same crypto on other transactions and then quickly broadcast the mined block. As such, the payment will be invalidated. Merchants who are not keen may end up accepting the unconfirmed transactions, to their loss.

As you can see there are so many ways through which double-spending attacks are initiated. As you are a merchant and want to reduce any chances of double-spending attacks, make it a habit to wait for block confirmations before accepting a payment.

Conclusion Thoughts

Most of the prominent networks like Bitcoin strive to tame double-spending attacks. However, it is important to be vigilant and only accept transactions that are confirmed on the block. There are other measures like Proof of Work mechanisms that are also being put in place to curb such risks. 


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