What is Blockchain?

Blockchain may be a system of recording information during a way that creates it difficult or impossible to vary, hack, or cheat the system.

A blockchain is a digital ledger of transactions that are duplicated and distributed across the whole network of computer systems on the chain. Each block within the chain contains a variety of transactions, and each time a replacement transaction occurs on the chain, a record of that transaction is added to each participant’s ledger. The decentralized database managed by multiple participants is understood as Distributed Ledger Technology (DLT).

Blockchain may be a sort of DLT during which transactions are recorded with an immutable cryptographic signature called a hash.


Blockchain, which began to emerge as a real-world tech option in 2016 and 2017, is controlled to vary IT in much an equivalent way open-source software did 1 / 4 century ago. And within the same way Linux took quite a decade to become a basis in up-to-the-minute application development, It will likely take years to become a lower cost, more efficient way to share information and data between open and personal business networks.

Based on a peer-to-peer (P2P) topology, It may be a distributed ledger technology (DLT) that permits data to be stored globally on thousands of servers – while authorizing anyone on the network sees each person else’s records in near real-time. That creates it difficult for one user to realize control of, or game, the network.

Types of Blockchain networks

There are a few ways to generate a blockchain network. They will be public, private, permissioned, or built by a consortium.

Public Blockchain networks

A public one that anyone can join and contribute in, like Bitcoin. Drawbacks might include significant computational power required, little or no privacy for transactions, and weak security.

Private Blockchain networks

A private blockchain network, almost like a public network, maybe a decentralized peer-to-peer network, with the many changes that one organization governs the network. That organization controls who is allowed to participate within the network, execute a consensus protocol, and continue the shared ledger. Counting on the utilization case, this will significantly boost trust and confidence between participants. A personal chain is often run behind a company firewall and even hosted on-premises.

Permissioned Blockchain networks

Businesses who found out about a personal blockchain, will generally find out a permissioned chain network. It’s important to notice that public chain networks also can be permissioned. This places restrictions on who is allowed to participate within the network, and only in certain transactions. Participants got to obtain a call for participation or permission to delay.

Consortium Blockchains

Many organizations can share the tasks of controlling a chain. These pre-selected organizations determine who may submit transactions or access the information. A consortium blockchain is right for business when all participants got to be permissioned and have a shared responsibility for the blockchain.

How Blockchain works:

Blockchain may be a chain of blocks that contains information. Each block consists of a variety of transactions and every transaction is recorded within the sort of Hash. Hash may be a unique address assigned to every block during its creation and any longer modification within the block will cause a change in its hash.

A block has mainly 3 parts:

  • Data/Information part- contain the knowledge of the transaction incurred
  • Hash- Unique ID of a block
  • Previous Hash- Hash of the previous block

Since during a chain, every block has the hash of its previous block, therefore if anyone tries to temper with the info in some block then the hash of the block is going to be changed. So he will need to change the ‘Previous hash’ of the next block. In doing so, this hash of subsequent blocks also will change. Eventually, the intruder will need to change the hashes of each block within the chain which isn’t easy in the least. Hence, the info within the chain is tamper proof and maintains its authenticity.

Pillars of Blockchain Technology

There are three main properties of Blockchain which have helped out it gain common acclaim are as follows:

  • Decentralization
  • Transparency
  • Immutability

Decentralized system hasn’t any core authority to dictate the reality to other participants within the network. Every participant on the network can access the history of transactions or confirm new transactions. During a decentralized system, the knowledge isn’t stored by one single entity. Everyone within the network owns the knowledge. If you want to interact together with your friend then you’ll do so directly without browsing a 3rd party.

One of the foremost interesting and misunderstood concepts in the chain is “Transparency.” Some people say that chain gives you privacy while some say that it’s transparent. 

An individual’s identity is secret via complex cryptography and characterized only by their public address. So, if you were to seem up a person’s transaction history, you’ll not see “Tom sent 1 BTC” instead you’ll see “1MF1bhsFLkBzzz9vpFYEmvwT2TbyCt7NZJ sent 1 BTC”.

Immutability, within the context of the chain, means once something has been entered into the chain, it can’t be tampered with.

Pros and Cons of Blockchain

For all its complexity, it’s possible as a decentralized sort of record-keeping is near without limit. To improve user privacy and finely tuned security to lower processing fees and fewer errors, blockchain technology may alright see applications beyond those outlined above.


  • Improved results by removing human involvement in verification
  • Cost-effective by eliminating third-party verification
  • Decentralization makes it harder to tamper
  • Transactions are secure, private and efficient
  • Transparent technology


  • Significant technology cost related to mining bitcoin
  • Low transactions per second
  • History of use in illegal activities
  • Susceptibility to being hacked


Blockchain could also be a comparatively new technology immediately with an extended journey ahead. So, it’s quite imminent that it will have cons and alongside pros also. Chain provides to form business and government procedures more accurate, efficient, and secure.

In today’s blockchains, each authenticating computer or node records all the info on the electronic ledger and is a component of the consensus process. In large blockchains like bitcoin, the bulk of joining nodes must validate new transactions and record that data if they’re to be added to the ledger; that creates completing each transaction slow and difficult. As we prepare to travel into the third decade of blockchain, it’s not a problem of “if” legacy companies will catch on to the technology it’s a problem of “when.”