Blockchains are decentralized, public, and peer-to-peer databases that store the history of digital transactions. They’re generally considered “immutable” ledgers since they cannot be altered without the approval of all parties involved in a given transaction.

However, there are a variety of ways a blockchain hack can be done. These include 51% attacks, replay attacks, DoS attacks, and smart contract exploits.

Is blockchain hack possible?

Debunking the Myth-Is blockchain hack possible

51 Percent Attacks

A crypto hacker has the ability to take control of more than half of the computing power of a blockchain, which is referred to as its “hashrate.” This number is used to validate transactions on the blockchain, which enables users to make changes that would not have been possible in the absence of these transactions.

This can lead to a variety of problems, including double spends, which occur when the same transaction is carried out multiple times, resulting in the expenditure of a greater number of tokens. Because of this, the value of coins might suddenly drop by a significant amount.
Hackers may cause disruption to the blockchain network by deleting or altering the data that is stored there, which may result in the network collapsing, which may result in significant damage.
Because of the smaller number of nodes in smaller cryptocurrency networks, these kinds of attacks are more common. This makes them more difficult to carry out, but they also have the potential to cause significant damage because they can rewrite the entire transaction history of the blockchain.

Replay Attacks

The addition of a new block to the blockchain without first verifying it is one of the most common ways that hackers can corrupt the blockchain. Because they have control over the majority of the network’s hash rate, they have the ability to rewrite transaction history to make it appear as though coins have been spent multiple times, which results in significant losses for those who use that coin.

This type of attack is most frequently seen on networks that use proof-of-work (PoW) algorithms, such as Bitcoin and Ethereum. But it could also be employed on blockchains with proof-of-stake (PoS) algorithms, like Monacoin.

The issue with this type of attack is that it requires an immense amount of computational power and resources to run a large number of nodes simultaneously. Thus, it’s likely not feasible for hackers to carry out such an operation.

Smart Contract Exploits

Hackers may try to target the blockchain by exploiting bugs in program programs running on a network. If programmers who created these programs haven’t taken sufficient measures to protect themselves, these vulnerabilities could be easily exploited by an intruder.

These issues have serious repercussions for a network’s security, leading to increased investment in cybersecurity. Companies recognize the importance of this problem and are taking steps to ensure their programs running on networks are robust and written with protection in mind against such bugs.