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Priya Gupta

Updated on May 20, 2026•science-and-technology

What is Blockchain technology?

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13 Answers
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Rohan Chauhan
Updated on Dec 25, 2025

If you have heard of Bitcoin (which you probably have), you must have also heard of Blockchain Technology. Many people are calling this revolutionary and many top institutions are already employing this technology. But what it really is?

Blockchain is a digital decentralized public ledger where transactions are recorded. The individual transactions – also called blocks – are recorded and added to the ledger in chronological order. There isn’t any central institute that handles the bookkeeping. It is completely independent.

The block or recent transactions are recorded through cryptography. And once it is recorded, it goes to the blockchain as a permanent database, which can never be altered. Each block usually contains a cryptographic hash pointer as a link to previous block. It’s actually what its name says, a chain of blocks.

This whole database – that is continuously growing – is created by a technology known as blockchain technology.

The main reason why blockchain technology came into existence and became so popular is because of the transparency and meddle-proofing in recording transactions it brings. Also, transactions recorded on digital ledger are much cheaper and quicker. This is the biggest reason why many tech companies and organizations in financial sector are taking up this sector.

India’s largest bank SBI (State Bank of India) has already announced that it soon will be using blockchain for smart contracts and KYC. Expect more joining this bandwagon as this technology matures

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Prreeti Radhika Taneja
Answered on Jan 7, 2018
Agreed Rohan. In coming months, the blockchain technology won't only be limited to crypto-currencies, banks but also to government. Don't be astonished if EVM data collated in next elections, use blockchain technology to be more transparent and upright.
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Dazzling Dazzler
AI & Future Tech Enthusiast
Answered on Feb 25, 2019

The blockchain is a system in which records of transactions are made in bitcoin or another cryptocurrency. It is maintained among several computers that are linked together in a well-formed network. This technology is like an internet which has built-in robustness.

The blockchain technology cannot be controlled by a single entity and it has no single point of failure.

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Olivia Martin
Answered on Jun 13, 2019
By allowing digital information to be distributed but not copied, blockchain technology created the backbone of a new type of internet.
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Bharathi Grover
Answered on Jun 19, 2019
A blockchain is a growing list of records, called blocks, which are linked using cryptography. Each block contains a cryptographic hash of the previous block a timestamp, and transaction data (generally represented as a Merkle tree).
By design, a blockchain is resistant to modification of the data. It is “an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way
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Tim Josh
Answered on Jan 20, 2020
Blockchain is just one of the technology which supports all cryptocurrencies such as bitcoin but the experts can see that it have a large scope in the future then just meets the needs of bitcoin. On further analysis, we found that it can bring enormous changes in the internet networks itself. Consistently, technology has evolved more and a type of blockchain has grown a lot. So, from today, blockchain is widely being used as a distributed ledger technology. This technology has created a chain of blockchain where each of the blocks contains information as well as the data stored together and verified. These blocks are further validated and attached to the string of transactions and information in the previous blocks.

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eweb guru
Answered on May 13, 2020
Blockchain innovation is most basically characterized as a decentralized, conveyed record that records the provenance of a computerized resource. ... Blockchain is most just characterized as a decentralized, dispersed record innovation that records the provenance of an advanced resource.
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Severine Johnson
Answered on Sep 27, 2020
Blockchain technology is based on peer-to-peer (P2P) topology, and it is a DLT i.e. Distributed Ledger Technology (DLT) in which data is stored on thousands of servers located worldwide. Anyone on the network is able to see everyone else's entries.
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Gaatha Anand
Answered on Apr 23, 2022

Blockchain has been hailed by many as the next frontier of technology, creating a new form of digital currency that's not controlled by any country or government. It's very secure and transparent, making it a perfect tool for all kinds of transactions.

The people behind blockchain say it will change the world but an impactful one is yet to be seen. For now, companies like Apple and Microsoft are eyeing blockchain as an input into their own products and services. The technology will likely have widespread use in just a few years with widespread implications afterward if its uses continue to expand in the future.

Is Blockchain really a Path-Breaking technology

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Tantrija Enterprises
Updated on Mar 31, 2026

We offer end-to-end blockchain development for startups and enterprises, building secure and scalable solutions on platforms like Ethereum, Solana, Hyperledger Besu, and private networks, including dApps, DeFi protocols, and enterprise-grade ledgers.

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MOHD ADEEB
Youth & Social Media Researcher
Answered on Apr 20, 2026

Blockchain technology is a decentralized digital ledger that records transactions across many computers in a secure and transparent way. Instead of relying on a single central authority like a bank, the data is stored in blocks that are linked together in a chain. Once a transaction is recorded, it’s very difficult to change or delete, which helps make the system secure and trustworthy. This technology is widely used in cryptocurrencies like Bitcoin, but it’s also being explored for many other industries.

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Michael Jons
Answered on May 9, 2026
 

Blockchain technology is a digital system for storing and sharing information in a way that is secure, transparent, and very difficult to change or hack. It is the foundation behind cryptocurrencies like Bitcoin, but its use is much wider than just digital money.

In simple terms, a blockchain is a chain of digital “blocks,” where each block contains data. This data can be anything—financial transactions, records, contracts, or even supply chain information. Once a block is filled with data, it is linked to the previous block, forming a continuous chain. That is why it is called “blockchain.”

What makes blockchain special is that it is decentralized. In traditional systems, data is stored in one central server (like a bank database). But in blockchain, the data is stored across many computers (called nodes) around the world. This means no single person or organization fully controls it.

Every time a new transaction happens, it is verified by multiple computers in the network using complex algorithms. Once verified, the transaction is added to the blockchain and becomes almost impossible to change. This creates a very high level of security and trust.

Another important feature is transparency. In many blockchain systems, all transactions are visible to participants in the network. Even though personal identities may remain hidden, the transaction history can be publicly checked, which reduces fraud and corruption.

Blockchain technology is not only used in cryptocurrency. It is also used in many industries like banking, healthcare, supply chain, real estate, and even voting systems. For example, in supply chain management, blockchain can track products from manufacturing to delivery, ensuring authenticity and reducing scams.

One of the biggest advantages of blockchain is that it removes the need for middlemen. For example, in banking, transactions usually go through banks or payment processors. With blockchain, people can directly transfer value to each other securely.

However, blockchain also has challenges. It can be slow for large-scale transactions, uses a lot of energy in some systems, and is still complex for many people to understand.

In conclusion, blockchain technology is a revolutionary system that improves security, transparency, and trust in digital transactions. It is changing how data and value are stored and transferred, and it has the potential to transform many industries in the future.

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Priyaa Agrawal
Answered on May 12, 2026

Blockchain is a digital technology that stores data in connected blocks instead of keeping it in one central server. Every transaction added to the blockchain gets verified by a network of computers, making the system transparent and difficult to hack.

This technology became famous because of cryptocurrencies like Bitcoin, but now it is also being used in banking, healthcare, logistics, and even voting systems.

One major advantage of blockchain is security because records cannot be easily changed once stored. In recent years, companies and governments have started exploring blockchain for faster and safer digital services. Experts believe blockchain could transform industries in the same way the internet changed communication.

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