What Is Blockchain Technology?

Blockchain is a decentralized, unchangeable database that makes it easier to track assets and record transactions in a corporate network. These digital ledgers leverage consensus and ongoing record-keeping to improve the effectiveness, dependability, and security of such procedures for all parties involved.

It is a technique for storing data that makes it difficult or impossible for the system from altering, hacking, or abusage. It is a type of distributed ledger that distributes and copies transactions throughout the network of computers involved.

The asset holder’s digital signature authorizes each entry in this ledger, which authenticates the access and guards against fraud. The information on the digital ledger is, therefore, very secure.

Moreover, information is the lifeblood of a company, and hence blockchain technology is essential. However, it is better if it is accessible immediately and on time. Because it provides real-time, shareable, and completely transparent data stored on an immutable ledger and only available to users of a permissioned network, Blockchain is the greatest solution for delivering this type of information.

The History Of Blockchain

The idea of blockchains was initially presented in 2008 by Satoshi Nakamoto, whose true identity is still unknown to this day. Nakamoto used a technique that was similar to Hashcash as the design kept becoming better and changing. Over time, it evolved into a key element of bitcoin, a well-known cryptocurrency that acts as a public record for all network transactions. 

The sizes of the files that made up the Bitcoin blockchain, which included all of the network’s transactions and data, were increasing significantly. Twenty gigabytes were attained in August 2014; by early 2020, it would have topped 200 gigabytes.

How Does Blockchain Work

There are three cutting-edge technologies combined in the Blockchain:

  1. Encryption (Cryptographic) keys
  2. A peer-to-peer system with a shared ledger
  3. A computing technique allows storing the network’s transactions and other essential data.

Private and public keys are the two key components of cryptography. Public keys facilitate the interaction between various entities in a transaction or exchange, while private keys ensure that no third party can access an individual’s information for nefarious purposes. A distinguishing feature of blockchain technology is this identification system which ensures security through these digital signatures meant to approve transactions only from authorized sources, without coming in contact with sensitive personal data such as social security numbers or driver’s licenses.

Peer-to-peer networks combined with digital signatures and a sizable group of people who serve as authorities utilize the digital signature to agree on transactions and other matters. A successful secured transaction between the two network-connected parties happens when they approve an agreement validated by a mathematical verification.

In simple words, a digital blockchain database comprises encrypted data blocks that are “chained” together and protected by challenging math problems. Since the Blockchain keeps a very accurate and secure record of prior acts, the math issues requiring matching nonces and hashes are virtually difficult to alter afterward. It is equally dispersed across several decentralized nodes, preventing ownership or control by any one entity.

A blockchain network makes it possible to track orders, payments, accounts, production, and many other things. Since everyone has access to the same version of the truth, you can also watch a transaction from beginning to conclusion. It increases your self-assurance and opens up new possibilities.

The Transaction Process Of Blockchain


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One way in which blockchain technology confirms and approves transactions is by attaching the transaction information to the other party’s public key. So if two parties were completing a transaction through their respective private and public keys, this whole compilation would be included in a block. 

One block can include a timestamp, digital signature, or even more information. When it comes to blocks themselves, they don’t actually have identities – though sometimes there are exceptions (for example, bitcoin addresses). Once these blocks are sent out onto the network (which has access to those private keys), one who holds that specific set of credentials will look for its match within all the blocks- once found, then it will verify whether or not this is true.

Here is a use case that exemplifies how Blockchain functions:

Hash Encryptions

The SHA256 algorithm is primarily used in blockchain technology to safeguard data through hashing and encryption. The SHA256 method is used to convey the sender’s address (public key), the recipient’s address, the transaction, and the recipient’s private key information. After being verified, the hash-encrypted information is sent around the globe and added to the Blockchain. The sender and receiver’s authentication is made more accessible by the SHA256 algorithm’s almost impenetrable hash encryption.

Proof of Work

Each block in a blockchain is made up of 4 significant headers.

First, the preceding block’s hash address may be found using the previous hash. Second, details of each transaction that must take place are provided in the transaction details. Third, an arbitrary number used in cryptography to distinguish the block’s hash address is known as a once.

All of the aforementioned (transaction information, nonce, and previous hash) are communicated via a hashing technique. The final one produces an output that is the distinct “hash address,” which is a 256-bit, 64-character value, and the block hash is the name given to it as a result.


Adding transactional information to the current digital/public ledger is a process known as “mining” in the context of Blockchain technology. The phrase is often used to refer to different Blockchain technologies, even though it is often linked with Bitcoin. Without the need for a central infrastructure, mining includes creating a block transaction hash that is difficult to counterfeit and ensures the security of the whole Blockchain.

Blockchain Types

There are the following types of Blockchain:

Public Blockchain Networks

A public blockchain is one that anyone can freely join and participate in. But some drawbacks are high demand for processing power; a lack of privacy when carrying out transactions; insufficient security measures. For these reasons, it’s essential to weigh whether a business can successfully implement such features before they commit time or resources.

Private Blockchain Networks

Similar to a public blockchain network, a private blockchain network is a decentralized peer-to-peer network. The network is nevertheless governed by a single entity that manages the shared ledger, implements a consensus mechanism, and controls who is permitted to participate. Depending on the use case, it may significantly boost participant trust and confidence. Additional possibilities exist for hosting a private blockchain locally or running one behind a corporate firewall.

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Permissioned Blockchain Networks

Businesses that build private blockchains frequently build a permissioned blockchain network as well. However, it’s crucial to remember that public blockchain networks can have permissions as well. It sets limitations on transactions and which is permitted to use the network. To participate, participants must get an invitation or authorization.

Consortium Blockchains

The duties of keeping a blockchain up to date might be split among several groups. The individuals who are allowed to submit transactions or access the data are chosen beforehand by these organizations. The ideal Blockchain for a business is a consortium blockchain where each member has to be authorized and share ownership of the Blockchain.

Is Blockchain Safe

Decentralized security and trust are made possible by blockchain technology in a number of ways. To start, new blocks are always chronologically and linearly stored. In other words, they are constantly added to the Blockchain’s “end.” As a result, unless a majority of the network has approved doing so, it is very difficult to go back and modify the contents of a block once it has been added to the Blockchain.

This is due to the fact that each block contains a timestamp, its own hash, as well as the hash of the block that came before it. Hash codes are created when digital information is mathematically transformed into a string of numbers and characters. In the event that the data is modified in any way, the hash code also changes.

Consider a scenario where a hacker who also manages a node on a blockchain network wants to change a blockchain and steal bitcoin from other users. They couldn’t change their own copy without changing everyone else’s copy, so they couldn’t do that either. When everyone checks their copies of the chain against one another and recognizes how distinct this one copy is, the hacker’s version of the chain would be recognized as fake.

To be successful, the hacker would need to simultaneously possess and change at least 51% of the blockchain copies, making their new copy the majority copy and, thus, the chain that has been agreed upon. Furthermore, due to the fact that every block would need to be recreated because of the new timestamps and hash codes, such an assault would also necessitate a tremendous amount of resources and money.

Benefits And Drawbacks Of Blockchain

Blockchain technology has a wide range of benefits, but it also has a number of potential drawbacks due to its decentralized infrastructure. The following highlights the key benefits and drawbacks of Blockchain:

Blockchain Benefits

  • Your company process will be better safeguarded with the aid of this technology due to its high degree of security.
  • There will be a significant decrease in the hacking dangers to your company.
  • Since Blockchain provides a decentralized platform, there is no need to pay for the services of centralized organizations or middlemen.
  • Organizations may employ various levels of accessibility due to enterprise blockchain technology.
  • Blockchain enables businesses to complete transactions more quickly.
  • Automated account reconciliation is possible.
  • Transparent transactions make them simple to follow.

Blockchain Drawbacks

Image by Gerd Altmann from Pixabay
  • This technology promises minimal prices for customers but also comes with substantial implementation costs for businesses, delaying its widespread usage and deployment.
  • It is difficult and new to use. It indicates a lack of software developers who are prepared for blockchain technology.
  • Blockchain records are not permanent and cannot be changed. Thus mining does not provide network security.
  • Its open and anonymous character is a liability, and proof of work is an unnecessary burden.
  •  It also makes it possible for illicit activities and trade to take place.
  • Research indicates that Blockchain technology is vulnerable to a 51% assault. Hence it is not entirely safe.


A cutting-edge technology, Blockchain offers a high degree of confidentiality and transparency. Numerous businesses from various industries are using blockchain technology as its popularity grows. As a result, it is probable that this technology will continue to exist and find several new applications.

What Is Blockchain Used For?

Blockchain, which was first utilized for Bitcoin and other cryptocurrencies, is now used cases in a number of sectors, including banking, real estate, and insurance.

What Is Decentralized Finance (DeFi)?

Decentralized finance is the term used to describe the transition in the economy brought about by decentralized technology, primarily blockchain networks. DeFi marks the transition from a historically centralized and closed financial system to an economy that is open to everyone and built on open protocols that are programmable, interoperable, and configurable.

What Is Distributed Ledger Technology?

Blockchain technology is a subset of the larger field of distributed ledger technology. To improve incentive design, security, accountability, collaboration, and trust, blockchain technology augments a distributed ledger with cryptographic features and a consensus process.

How Does Blockchain Work?

A transaction is first started by the node using cryptography to sign it with a private key. The genesis block is the first block that contains the transaction once it has been verified. The newly added block will be added to the ledger, and the transaction will be reaffirmed each time a new block is created. In a network, a transaction must receive six confirmations before it is deemed complete.

Who Controls the Blockchain?

No one user has control in a blockchain network; instead, power is shared among all users. Numerous nodes with considerably less power are available there.

 Why is Blockchain Important?

Blockchain gives security, transparency, and trust between the user network. Additionally, it provides effective and economical techniques for exchanging and recording data.

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