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What is Hashing in Blockchain?

In this blog, we will cover important topics like hashing and its applications, blockchain, why is hashing used in blockchain, and its importance and uses.

Table Of Contents

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What is Hashing?

Typical hash functions accept variable length inputs and generate fixed length outputs. A cryptographic hash function combines hash function message-passing capabilities with security features. The original data cannot be recovered through decryption after conversion since the algorithm is a one-way cryptographic function.

It’s crucial to first know the data structure in order to completely appreciate what hashing is all about. A data structure is a specific kind of data storage that mostly consists of linked lists and pointers.

Pointers act as markers that guide users to the intended location since they are variables that relate to other variables. Additionally, it also provides the address of the chain’s subsequent block. Linked lists are collections of nodes that are connected by pointers.

Hash functions are extensively used data structures in computing systems for activities such as message integrity verification and information authentication. Even though they are not easily decipherable, they are deemed cryptographically weak since they can be solved in polynomial time.

Where is Hashing applied?

Applications Of Hashing

The creation of hash tables is the most common application of hashing. Key and value pairs are kept in a list that can be accessed using a hash table’s index. All value pairs will be kept in the hash table’s list, which may be retrieved quickly using its index.

The end result is a means for efficiently obtaining key values in a database table as well as a way to increase a database’s security through encryption.


Cyberspace makes extensive use of hashing. The use of hashing in encryption is one that, in today’s environment where cybersecurity is crucial, gets the most prominence.

For security reasons, a good hash function is always a unidirectional procedure that employs a one-way hashing method. This way, the encryption would not be useless when hackers quickly reverse-engineer the hash to get the original data.

A hash function’s input might be supplemented with random data to further boost the uniqueness of encrypted outputs. This process, called “salting,” ensures distinct output even when the inputs are identical. For instance, a rainbow table or a dictionary attack might be used by hackers to retrieve user credentials stored in a database. Salting prevents the tempering of data during such attacks.

Data Retrieval

Hashing is widely used for Data Retrieval. With the use of algorithms and/or functions, hashing encodes object data into a useful integer value. The search for these objects on that object data map may then be honed using a hash.

For instance, developers store data in the form of key and value pairs in hash tables, which may include customer records. The hash code or the integer is then mapped to a predetermined size, while the key aids in data identification and serves as an input to the hashing method.

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After a deep understanding of Hashing and its applications, let us understand Blockchain.

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What is Blockchain?

In its most basic form, a blockchain is a continuously updated and reviewed distributed ledger of transactions. It may be configured to record and monitor anything of value across a network dispersed around many locations and entities. This is also often referred to as distributed ledger technology.

The block and the chain are the two halves of a blockchain, respectively. A block is a group of data that is connected to other blocks in a virtual chain chronologically. A blockchain may be compared to a railway with several cars connected in a line, each carrying a certain quantity of data. Blocks can only hold a specific amount of data until they are full, just like people in a real train carriage.

Additionally, each block has a timestamp, which makes it apparent when the data was captured and saved. This is crucial for things like transaction or supply chain data, where knowing the precise moment that a payment or item was handled is critical.

The blockchain is the foundation of a cryptocurrency. The blockchain keeps track of verified transactions, preventing double spending and fraudulent transactions. The resultant encrypted value is known as a hash and is composed of a string of numbers and letters that have no relation to the original material. Working with this hash is a part of cryptocurrency mining.

Hashing gives an output of a set length after putting the information from a block through a mathematical algorithm. Because someone attempting to decrypt the hash won’t be able to determine the length of the input by looking at the length of the output, using a fixed-length output boosts security.

Despite being frequently linked to cryptocurrencies, blockchain technology is not just used in the market for digital assets. It can do a wide variety of various tasks across several sectors because of its remarkable capacity to add and store data.

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Why is Hashing used in Blockchain?

It refers to the technique of having an input item of any length mirror an output item of a defined length. In the case of blockchain applications in cryptocurrencies, transactions of variable duration are processed by a certain hashing algorithm, and all produce an output of a set length. This is true regardless of how long the input transaction is.

Bitcoin’s SHA-256 is one such example. Hashing using SHA-256 always yields an output result of a defined length, which is 256 bits (the output is 32 bytes). This is true whether the transaction is as simple as a single word or as complicated as a transaction involving massive quantities of data.

This implies that keeping track of a transaction becomes easier when the hash can be recalled/traced. The size of the hash will vary depending on the hash function used, however, the output from a specified hashing technique will be of a set size.

Why is Hashing used in Blockchain? Hashing gives each block in the blockchain a distinct identity, therefore changing the blockchain will have inescapable effects. Information that acts as the block’s identification is found in the block’s header.

A lot of components are required to construct the block. As a result, when a blockchain hash happens, the data is turned into a unique string inside a block.

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How is Hashing in Blockchain useful?

Importance and Uses of Hashing in Blockchain

Hash functions are frequently employed to ensure the integrity of data. Given a trustworthy hash of the data, the hash of the data is calculated and the two values are compared. If they match, the data has most likely not been changed since the hash was formed.

As a result, hash functions and the integrity protection that they provide have a variety of applications on the blockchain. Among the most popular applications of the hash function in blockchain are:

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Bottom Line

Blockchain has the ability to significantly alter global business operations. It provides solutions to the issues that many organizations are experiencing.

Hashing is also groundbreaking in a similar way. Hashing provides a more adaptable and secure method of retrieving data when compared to alternative data formats. It is quicker than searching for arrays and lists.

Together, these two have the power to fundamentally alter how firms function and therefore will be highly regarded in the IT world in the ensuing decades.

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