What is blockchain technology and how does it work?

Have you ever heard the word “blockchain” in discussions about Bitcoin, cryptocurrency, or art and gaming? Does that word and its connection with the rest of the terms confuse you? Most of the explanations take you directly to the jargon, which leaves people wondering what these terms mean. This article will break all these terms down into readable and easy words so that you understand What is Blockchain Technology and how it operates. 

By the end of this article, you will be able to understand blockchain technology completely, along with all the technical jargon. You will see and learn all the important points step-by-step and in detail.

What is Blockchain Technology?

The first question is, 'What is Blockchain Technology?’ Blockchain technology is a digital record, usually known as a ledger. It is shared among various computers instead of being stored in a single one. Every time there is new information added, it is by default organised into a "block", and that specific block is linked to the one before it. Connecting these blocks forms a chain. This is finally known as blockchain technology. 

A standard database is controlled by a single company or person, whereas a blockchain is spread among a cluster of networks of computers, which are generally known as nodes. Each node creates and keeps a copy of the ledger. All of those copies are checked against each other to ensure that everyone knows and agrees on the accurate information. This practice makes all the difference between blockchain technology and traditional record-keeping systems. 

Blockchain technology was introduced to the world in 2008 with a paper written by Satoshi Nakamoto. He created the design for Bitcoin. Since then, the technology has evolved a lot beyond cryptocurrency. In the current times, it is used in fields like supply chain tracking, digital identity, and decentralised finance. 

This will also help you compare the idea of blockchain technology to something similar to it. Imagine there is a document shared online, and lots of people can see it at the same time. Except for the company that is hosting the document on its servers, all other computers have a similar copy. If someone ever tries to secretly edit something in their copy, the rest of the network will instantly spot the movement and reject the changes made. This difference illustrates the core spirit of blockchain technology, even though the actual system includes a lot more modified cryptography behind the scenes. 

What is the history behind blockchain technology?

Before blockchain came onto the scene, most digital records were controlled by a single trusted authority, like the banks keeping track of your bank account balance. This works fine most of the time, but it also means you will trust that one host company to maintain the records precisely and fairly. 

Blockchain technology was created and introduced to bring a solution to this problem by eliminating the requirement for one central authority. Instead of trusting one company blindly, the network depends upon many independent computers that are working together to decide what the truth is. This idea or practice is known as "decentralisation", and it is the basis behind the operation of blockchain technology. 

To understand What is Blockchain technology, you will also have to understand the problem that it was originally built to resolve. Satoshi Nakamoto initially wanted to create online money that is not dependent on banks or the government to operate properly. This is why the first blockchain was introduced to specifically support Bitcoin. 

What are the core building blocks of blockchain technology?

If you really want to understand the depth of blockchain technology, you will need to break it down into its core building blocks. 

The following are the major parts that have made blockchain technology operative: 

• Blocks – Blocks are groups of transactional data, along with a timestamp and a different code known as a hash.
• Nodes – Nodes are referred to as the computers that store and help organise copies of the blockchain.
• Consensus Mechanisms – Consensus Mechanisms are the rules that support the network to agree on the valid and accurate transactions.

• Cryptographic Keys – The cryptographic keys are the digital codes that are used to prove ownership and sign the transactions with safety.

• Smart Contracts – Smart contracts are small computer programs that automatically carry out an agreement once the specific conditions are met accurately.

Each of these blocks has a certain role to play, and when they are combined, they tell you how blockchain technology keeps its process and operations safe and truthful without any central authority in charge.

How does blockchain technology operate? 

You have seen all the basic factors of blockchain technology; now you must look at the process and understand how blockchain technology operates. The following is the step-by-step process of how blockchain technology works:

Step 1: A Transaction request is sent 

The process of blockchain technology starts with someone wanting to record a transaction, like sending cryptocurrency to another person or logging a certain change in a supply chain record. This request is sent to the network of computers, or nodes, that are responsible for maintaining the blockchain. 

Step 2: Verification of the transaction is done.

After the transaction request is sent, it is instantly added to the blockchain. Before that, the network is supposed to confirm that it is valid. This is the place where the consensus mechanism enters. The following are the 2 most common ways to verify:

• Proof of Work – The proof of work, also known as the PoW method, is used by Bitcoin. This method needs computers, known as miners, to solve complicated mathematical puzzles. The first computer to solve the puzzle receives a chance to add another block along with a reward.
• Proof of Stake – The proof of stake, also known as the PoS method, is used by Ethereum and lots of other blockchains today. This method needs participants, known as validators, to “stake” or lock up a specific amount of cryptocurrency as a guarantee of truthful behaviour. Ethereum officially transferred from PoW to PoS in 2022, in an update known as “The Merge”.

These methods have an aim to achieve the same goal: ensuring that everyone on the network agrees on the transactions that are real and valid. They perform this without requiring any central authority to do it.

Step 3: The transactions are organised into a block

Once the request is verified, the transaction is grouped with the rest of the most recent transactions into a single block. Each block involves a timestamp and a unique code, known as a cryptographic hash, that is like an online fingerprint for that selected block’s data. 

Step 4: Adding the block into the chain

After all this process is done, the new block is linked to the previous block with the help of its hash. It forms a continuous chain of blocks. This created link matters, as it helps secure the data. If someone ever tries to make changes to the data in the previous block, the hash would change entirely, which would break the chain and instantly alert the network that there is something wrong. 

Step 5: The updating of the ledger across all the networks

Lastly, after the block is added, every node on the network modifies its own copy of the blockchain to include the new block. As hundreds of computers have identical copies, it turns out to be very difficult for a single person to alter historical records secretly. If someone wants to do so, they would have to make changes in most of the copies at the same time, which ultimately stops this practice or makes it difficult. 

What are the core features of blockchain technology?

Now you know the basics of blockchain technology, but to make things even easier to memorise, you should know the core features of this technology.

The following are the basic features of blockchain technology:

• Decentralisation – Blockchain technology was introduced to resolve the problem of trusting a single company with the complete network. Decentralisation says that a single company or person cannot control the complete network cluster.
• Transparency – Blockchain technology aims to maintain trust. Transparency means that there are transactions visible to everyone on the public blockchains, which allows everyone to verify any activity.  

• Immutability – Blockchain technology is known for its advanced system. It has immutability, which means that once the data is recorded and confirmed, it becomes very difficult to alter or delete it.
• Security – Imagine introducing a new technology that cannot even protect your data. There is no point to it, right? This is why blockchain technology has cryptography that protects the data and verifies the identity of participants without revealing secret information unwantedly. 
• Peer-to-peer Transactions – Peer-to-peer transactions mean that people can transact directly with each other without requiring a bank or middleman in between.

When these features are combined together, they explain the reason why so many industries are preferring to explore blockchain technology instead of just cryptocurrency. 

What is the difference between private blockchain and public blockchain?

There are different types of blockchains that work differently. The following are the 2 most popular and broad categories under blockchain technologies: 

• Public Blockchains: The public blockchains suggest their meaning from their name. They are public, which means they are open to everyone. It has no restrictions on who is allowed to join, view transactions, or participate in the consensus process. Some of the most common examples are Bitcoin and Ethereum. 
• Private Blockchains: A private blockchain, also known as a permissioned blockchain, has its access restricted to specific and approved participants, often used by businesses that want to enjoy the benefits of blockchain technology. For example, a company wants to use services like secure record-keeping without making all the data public. 

When you are supposed to choose between a public or private blockchain, your decision will usually depend on the specific goals of the organisation or project using it. For example, whether openness or controlled access is required more for their needs. This differentiation is an important part of understanding what is Blockchain Technology. The same underlying idea can be applied in lots of different ways depending upon who requires access to the data. 

Conclusion:

So what is blockchain technology anyway? It’s basically a shared, secure digital ledger that allows many computers to agree on and record information without needing to trust a single central authority. The idea of blocks, cryptographic hashing and consensus mechanisms such as Proof of Work and Proof of Stake make blockchain technology a transparent, hard-to-tamper-with and resistant-to-a-single-point-of-failure system.

Blockchain technology was developed as the technology behind Bitcoin. However, it has emerged as a tool with applications in many industries, from supply chains to digital identity systems. These fundamentals help to explain why the technology continues to resonate in the conversations about the future of finance, data and digital trust.

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