How does a Hash help Secure Blockchain Technology?


How does a Hash help Secure Blockchain Technology? A hash helps in securing blockchain technology. Blockchain is one of the best computing innovations. In blockchain, a hash refers to the process of taking an input or we can say a message of any length, and then converting it into a fixed-size string of characters. This fixed-sized output is represented as a sequence of letters and numbers and is called a Hash. hash functions are created by using strong Mathematical formulas.

As we know blockchain technology has different approaches for securing and storing data but Hasing is one of the most popular and widespread.

Now let’s understand how exactly a hash helps in securing blockchain technology. 

How are hash and Blockchain Linked?

To understand the Blockchain and Hashing let’s consider that blockchain is a digital ledger book where we can store all our transactions. Each page in this book is like a block and multiple computers called nodes have copies of this book.

How does a Hash help Secure Blockchain Technology?
How a hash and Blockchain are linked

Once a page is filled its content is sealed and it is added to the book. But the exciting thing is that the sealed page has a special code. This special code is our hash function. This hash is generated by the contents on that page so no one can guess the code by random. In this way a Hash help in securing the blockchain technology. 

Two Most Used Hash Functions in Securing Blockchain 

Hash functions in blockchain have many types but are mostly used in SHA-256 and Scrypt.

Two Most Used Hash Functions in Securing Blockchain

SHA-256 (Secure Hash Algorithm 256)

SHA-256 is the hashing algorithm used in Bitcoin and many other cryptocurrencies. It is primarily used for generating digital signatures and confirming the integrity of data stored in the blockchain.

SHA-256 produces a fixed-size output of 256 bits (32 bytes) regardless of the input size. It is designed to be fast and efficient for performing mathematical operations.

SHA-256 is widely considered secure against cryptographic attacks due to its one-way nature. It is resistant to collision attacks, where two different inputs produce the same hash value.


Scrypt is an alternative hashing algorithm used in cryptocurrencies like Litecoin and Dogecoin. It was designed to provide a more memory-intensive alternative to SHA-256. It aims to make mining less susceptible to ASICs and promote decentralization.

Unlike SHA-256, Scrypt is memory-hard, requiring a significant amount of memory to compute. 

Scrypt offers similar security properties to SHA-256, providing cryptographic hash functions that are resistant to collision attacks and other cryptographic vulnerabilities.

How Does Hashing Help in Securing Blockchain?

Technology is completely changing the society we live in by providing us with much more security than ever before. Hashing in the blockchain helps to secure the information in multiple ways. 

Ways to Secure Blockchain Technology with Hash

Data Integrity

Blockchain uses cryptographic hash functions to create unique digital fingerprints of each block of data. These hashes ensure that the data within each block cannot be altered without changing the hash value. If someone tries to alter the data in a block, the hash value will change, alerting the network to the tampering attempt.


A block added to the blockchain cannot be altered once it has been added. The hash of each block is calculated by comparing it with the hash of the previous block. For this reason, any modification to one block would require recalculating the hash of all subsequent blocks. The immutability of the blockchain is assured by making it computationally impossible to alter past transactions.

Tamper Resistance

Unique hashes are created for each block of data in the blockchain which ensures tamper resistance. The contents of the block including transaction data, timestamp, and the previous block’s hash are used to compute these hashes. A completely different hash value would be used if any attempt is made to modify the data within a block. Thus, by comparing the hash of a block with its previously recorded value, the network can easily detect and reject any unauthorized alterations, preserving the integrity of the blockchain.

Consensus Protocols

Hash functions are also used in various consensus mechanisms, such as Proof of Work (PoW) and Proof of Stake (PoS), to achieve agreement among network participants on the validity of adding transactions to the blockchain in a particular order. In PoW, miners compete to find a hash value that meets certain criteria, while in PoS, validators are chosen based on the amount of cryptocurrency they hold and their likelihood of creating a valid block. 

Address Generation

The hash functions generate the public and private key pairs used in blockchain transactions. A cryptographic hash function can take a public key as input and generate a unique address for receiving transactions. Similarly, a hash function can be used to create a digital signature for verifying the authenticity of transactions.


How does a Hash help Secure Blockchain Technology? Overall we can say hashing plays a crucial role in the security of blockchain technology. There are many ways of hashing but two important are SHA-256 and Scrypt. These both have their limitations and advantages. Choosing any of them depends upon the resources available and the type of security we want.

Hash Functions are an active part of Digital Signatures too, which are used in cryptography. So we can say a hash helps to secure blockchain technology effectively. 

The SHA-256 (Secure Hash Algorithm) is used as a hash function in Blockchain technology.

A hash chain is known as a sequence of hashes of blocks. Whereas, a blockchain is a chain of blocks that are linked together and verified continually using hash values.

One hash converted in US dollars has a worth of 0.000573 USD.

In blockchain technology, a hash token is a unique identifier which is generated when a hash function is applied to a block of data.

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