What is double-spending in crypto and how to solve it

Double spending is one of the biggest risks that pose a huge threat to cryptocurrency. People see it as a problem and a technical flaw that exposes all digital assets, making it prone to many possible intrusions, hacks and even more exploits in the long run.

Crypto double spending has been rampant in the industry for a while now, and many malicious users have taken advantage of the system’s flaw to get more out of the money they tried to get. Double spending of the same digital currency takes a toll on all crypto users with their fundings exposed.

How double spending works

Since digital currencies are also considered as files, users can create more than one copy of the same currency file. What’s worse is that they can use it in multiple places, and this can happen even if there is just a simple change in the copies of the currency within the network and not just the original one. This makes double spend crypto a huge problem for asset holders. 

There are also certain double spends that give way for hackers to reverse transactions so that they can push them to become two or three processed requests in total. The users affected by the hack will lose money twice or more for the fake block created by the hacker along with the original block. What’s worse about this is that the hacker even gets incentives even for the fake blocks that have been mined and confirmed by the blockchain. 

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Types of double spending attacks you should know about

Double spending never comes up in a physical manner. It happens in online transactions where there is no governing body or authority that can check all of the processes at a given time. With that kind of common-level security and no one to preside over the transactions, crypto is left unattended with no one to verify each of the processes for a duplicate.

There are many types of crypto double spend attacks to keep track of. Some of these attacks are pretty harmless but all of them can deal a lot of loss for your accounts if left unchecked. Here are three types of double spending attacks you should know of:

Finney attack

A Finney attack is one of the most common processes of double spending. A merchant may accept an unauthorised transaction, and the original block will then be shadowed by the hacker with an eclipse attack. The real block will later show up with the transaction already complete, however, it marks that the merchant has lost money twice.

It requires the participation of a miner once the block is mined. This risk cannot be eliminated unless users will take caution in their transactions. This is why users must consider the cost and benefit of accepting payment on just one confirmation at most since this means that there are a lot of risks in the said transaction.

Race attack

Another double spend attack crypto has is the race attack. This is mostly considered as a mistake since traders and merchants who quickly accept payment are exposed to having the transaction reversed. This sends a conflicting request for another payment and will likely lead to double transactions but will be mined into a block and accepted by nodes as genuine.

Merchants can prevent this by holding off all connections and ensuring that the nodes they connect are reliable enough. Since the risk cannot be eliminated, one can say that the best way to stave off race attacks is to always verify the other end of the transaction to make sure where their funds are headed.

51% attack

More known as the majority attack, this 51% attack is the most daring yet rewarding for hackers. The blockchain operates in hash rates, and the most dominant data will be the prevailing copy. This is why hackers target the blockchain itself as they replace each block and once they have control of more than half of the network, the attack now has a 100% chance to succeed.

This is not just a double spend attack, but more of a wide-range hack across the system. It supersedes any Bitcoin double spending incident since hackers can withdraw all of the funding in the blockchain. The only way to stop this is to freeze the whole network to prevent more intrusions and loss of data.

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How does crypto solve double spending

There are some electronic systems that prevent double spending by using a master authoritative source that sticks to the business rules in checking each transaction. Bitcoin does the same with a decentralised system. The consensus among nodes follows the same protocol, with the proof of work system in place for a central authority.

To combat double spending Bitcoin issues and in other currencies, employ various security measures to keep them safe at all times. There are no guarantees, but a reliable layer of defence is better than nothing at all. Here are three ways for crypto to solve double spending threats:

Validation and timestamps

Transactions are checked and validated by a set number of nodes in the network. As soon as a block is created, it is added to a long list of pending processes. Users may send a request to validate the block and once it is done, only then will the block be added to the rest of the blockchain network.

Timestamps are added as soon as transactions are received and completed. However, these ones are irreversible since it records a certain moment when the request was processed right away. For starters, if a transaction is made with a specific Bitcoin, it will only be accepted once and will be turned down the next time it turns up for checking.

Block confirmations

Block confirmations are a key element to stave off double spending. Merchants can get requests all the time but also have the option to just block them all. There will be notifications confirming that there is no case of double spending allowed. This is the first layer of defence for all crypto when it comes to double spending.

In Bitcoin, there are at least six confirmations to be done. The security system takes note of the user and Bitcoin used for the double spending attempt and will then discard it because of the same hash, making it safe for the whole blockchain network as a whole.

Preserving copies

When the crypto network goes down for any reason, the blockchain keeps a copy of each transaction in each node. This means that when the network is operational again, the copies altered will need to beat the stored copy prior to the shutdown as the prevailing block.

Hackers must replace each block with their new data included until they reach 51% of the blocks in the network. A slight variance in their blocks with the new data will be replaced by the stored copy and render the hack a failure. 

Double spending stands as a huge threat to crypto

While a lot of experts boast the fact that the blockchain is considered to be impenetrable, double spending is still a considerable threat to the crypto industry. It has exposed blockchain’s loopholes, which has led to a lot of doubt about the process when it comes to securing all crypto investments.

With the right prevention and cautious dealing, users can avoid certain hacks and unwanted transactions in the long run. This is why it is important to learn how double spending works and the best ways to prevent it from happening in the first place.

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Words: Paul Daniel Flores