What is Blockchain?

Blockchain is a data structure with transactional records and it’s impossible to change or hack the data. It is a chain of records stored in the form of blocks. A blockchain is duplicated and distributed across the entire network of computer systems on the blockchain.

Each block in the chain has a number of transactions, and every time a new transaction occurs on the blockchain, a record of that transaction is added to every participant’s ledger. Distributed Ledger Technology (DLT) is a decentralized database managed by multiple participants.

Blockchain Technology

Blockchain technology is one of the trends in web development and many best web development companies in Chennai are using this technology. Understanding blockchain technology is similar to learning how to use Google Docs.

When we generate a document and share it with a group of individuals, it is disseminated rather than replicated or moved. This creates a decentralized distribution chain in which everyone has access to the document at the same time. No one is locked out while someone else makes modifications to the document, and all changes are tracked in real-time, making them completely transparent.

Of course, blockchain is more complicated than a Google Doc, but the analogy is instructive because it underlines three crucial concepts:

  • Blocks
  • Miners
  • Nodes

Every chain is made up of a number of blocks, each of which has three basic components:

The information is contained in the block.

A 32bit whole number is referred to as a nonce. When a block is built, a random nonce is created, which is then used to generate a block header hash.

The nonce is coupled with a hash, which is a 256bit value. It needs to start with a lot of zeros (i.e., be extremely small).

When the initial block of a chain is produced, a nonce generates the cryptographic hash. The data in the block is considered signed and irreversibly connected to the nonce and hash unless it is mined.


The technique through which miners add new blocks to the chain is known as mining. Each block in a blockchain has its own nonce and hash, but it also refers to the hash of the preceding block, making block mining difficult, especially on big chains.

Miners solve the mathematical difficulty of creating an acceptable hash using a nonce with specialized software. Because the nonce is only 32 bits long and the hash is 256 bits long, there are around four billion nonce-hash possibilities to look through before deciding on the best one.

Miners are considered to have discovered the “golden nonce” when this happens, and their block is added to the chain. Any modification to a block earlier in the chain necessitates re-mining not only the damaged block but all subsequent blocks as well. This is why manipulating blockchain technology is so tough.

Consider it “safety in math” because finding golden nonces takes a long time and a lot of computer resources. When a block is successfully mined, the change is acknowledged by all nodes in the network, and the miner is rewarded financially.


Decentralization is one of the most significant characteristics of blockchain technology. The chain cannot be owned by a single machine or entity. Instead, the nodes that link to the chain form a distributed ledger. Any type of technological device that retains copies of the blockchain and keeps the network running is referred to as a node.

Every node has its own copy of the blockchain, and in order for the chain to be updated, trusted, and validated, any newly mined block must be accepted algorithmically by the network. Due to the transparency of blockchains, any action on the ledger can be easily reviewed and probed.

Each member is assigned a one-of-a-kind alphanumeric identification number, which is used to track their transactions. The blockchain preserves the integrity and builds confidence among users by combining public data with a system of checks and balances. In a nutshell, blockchains are a technology that can scale trust.

The rise of blockchain technology begins with cryptocurrencies. The most well-known (and possibly most contentious) application of blockchain is cryptocurrency. Bitcoin, Ethereum, and Litecoin are examples of digital currencies (or tokens) that can be used to purchase goods and services.

Here are some of the main reasons why everyone is suddenly taking notice of cryptocurrencies:

Because each cryptocurrency has its own irrefutable identification number that is linked to one owner, the security of blockchain makes theft considerably more difficult. Crypto eliminates the need for personalized currencies and central banks.

With blockchain, crypto may be transmitted to anybody, anywhere in the world, without the requirement for currency conversion or central bank intervention. Cryptocurrencies have the potential to make some people wealthy. Speculators have helped some early adopters become billionaires by driving up the price of crypto, particularly Bitcoin.

Whether this is beneficial or not has to be seen, as some critics argue that speculators aren’t thinking about the long-term benefits of crypto. The idea of a blockchain-based digital currency for payments is gaining traction among huge organizations. Tesla notably declared in February 2021 that it will invest $1.5 billion in Bitcoin and use it as payment for its cars.

Of course, there is a slew of reasonable arguments against blockchain-based digital currencies. To begin with, the bitcoin market is not well-regulated. Many countries have embraced cryptocurrencies, but few have put in place legal rules to handle them.

Furthermore, cryptocurrency is particularly volatile as a result of the aforementioned speculators. In 2016, Bitcoin was worth around $450 per token. It soared to nearly $16,000 per token in 2018, dipped to around $3,100 in 2019, and has lately risen to over $60,000.

Some people have gotten immensely wealthy as a result of the lack of stability, while others have lost tens of thousands of dollars.

Whether digital currencies are the way of the future remains to be seen. For the time being, it looks that blockchain’s meteoric rise is based on fact rather than rumor. Despite the fact that it is still gaining traction in this brand-new, high-risk market, blockchain is showing promise outside of Bitcoin.


The technology’s transparency and security have seen rapid adoption across a variety of areas, much of which can be traced directly to the development of the Ethereum blockchain. Programmers can use the Ethereum blockchain to build complicated programs that can communicate with one another.