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What makes a blockchain network Immutable?

One of the attributes that the blockchain is often associated with is its immutability. In its technical nature, Blockchain is an immutable database, and you cannot manipulate data that’s already in the blockchain. The hash value is unique, identifying one block. It depends on the block’s content, so each block has its unique hash value, and it’s identifying this block only. Therefore each block can reference or point to the block before, which means the four-block is taking a reference to the third one is taking a reference to the second, and so on. So that reference is made by the hash value.

The simplest way to explain the blockchain process can be: Let’s, for example, implement the blockchain in a simple yet flawed bank transaction. Suppose A wants to send money to B. The transaction is represented as a “block.” This block is broadcast to every party in the network. Those in the network approve whether the transaction taking place is valid. As iterations go on, a chain is formed, showing transparency in transactions. Lastly, the cash flows from A to B, and the transaction is complete.

Here, in the above example, blockchain’s immutable nature is visible, making it flawless. The combination of validations done with the blockchain hashing process and cryptography makes it immutable.


How is Immutability Achieved?

One of the key elements that make blockchain immutable is cryptographic hashes, which is why blockchain is immutable. The main advantage of a hash is that it cannot be reverse-engineered. That’s the reason why it is so popular. The most popular hash function is SHA-256, i.e., Secure Hash Algorithm 256.

There’s an input that goes into the hash function with a checksum as the end-product. In the below image, we can see how ‘Blockchain is Disruptive’ goes as an input, after which hashing occurs, resulting in an encrypted output as a checksum.

Advantages

The biggest advantage of blockchain is that the data cannot be altered, whereas, as seen in the traditional databases, the data can be modified and deleted easily. And if any instance occurs where the data is tampered with, the blockchain breaks. Making changes in both disconnected and live blockchain advancements is very troublesome.

When individuals allude to the blockchain as permanent, it implies that it is hard to make changes without conspiracy, not that the information can’t be changed. Hence, it answers the question of why blockchain is immutable. Furthermore, this innovation has both positive and negative ramifications for information security.

Ledgers that send blockchain innovation can ensure the full history and information trail of an application. When an exchange joins the blockchain, it remains there to portray the record up to that point in time. The respectability of the chain can be approved whenever by basically re-ascertaining the square hashes — if an inconsistency exists between block information and its comparing hash that implies the exchanges are not legitimate. This permits associations and industry controllers to identify information dabbling rapidly. This ensures complete data integrity.

This word ‘immutable’ is utilized to indicate something which can never be adjusted or changed. When a blockchain exchange has gotten an adequate degree of approval, some cryptography guarantees that it can never be supplanted or turned around. This imprints blockchains as unique in relation to standard records or data sets, in which data can be altered and erased freely.

We hope you have found this article informative and interesting. For more information or queries contact us to know more about this technology.

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