What is a blockchain?

The purpose of this article is to explore the world of Blockchains such as what is a blockchain, what is the difference between public and private blockchains, how do mining nodes receive block rewards and smart contracts.

So, you want to know what is a blockchain? When you hear the word blockchain, the term bitcoin comes to mind. The blockchain is more than just Bitcoin. There is an entirely new world out there being funded by venture capitalists to create a new decentralized world and break the stranglehold that Google, Microsoft, and others have on the current Internet. 

But, it is also a fascinating technology that we briefly explore in this article. 

Introduction to Blockchain Technology

The blockchain is a decentralized ledger that allows transactions to be recorded without the need for a third party. It is the underlying technology behind Bitcoin, Ethereum, and other cryptocurrencies.

With the blockchain, transactions are time-stamped, permanent, and public. There are also no transaction fees or delays in this system. As a result, it is an attractive option for many different types of transactions.

Blockchain is a type of distributed ledger that stores and records transactions. It is a shared and immutable record of all transactions which cannot be changed after the fact.

Blockchain technology has been around for about a decade now, but it is only recently that it has been getting popular. It is important to note that blockchain technology has many use cases, spanning from reducing fraud to making digital currency more secure.

What Is BitCoin?

Bitcoin is a digital currency that is not tied to a country and is not backed by a central bank. It can be used to purchase goods and services from stores and online retailers.

Bitcoin transactions are verified by network nodes and recorded in a public distributed ledger called the blockchain. The blockchain prevents double-spending by recording transactions chronologically so that the most recent transaction takes precedence.

What is Ethereum?

Ethereum is a blockchain-based decentralized platform that runs smart contracts.

Ethereum was created in 2013 by Vitalik Buterin, a cryptocurrency researcher and programmer. It was built to be a platform for decentralized applications. Ethereum is the second-largest cryptocurrency by market capitalization, after Bitcoin.

Decentralized applications (also known as DApps) are a way to write software that runs on a decentralized network, more like a peer-to-peer network vs the traditional model of today a client-server network. Ethereum is the most popular platform for DApps but there are a lot of other third parties blockchains that support decentralized applications. 

What is the Difference Between Public and Private Blockchains?

Public blockchains are the ones that everyone can see and use, while private blockchains are only accessible to a select group of people.

Public blockchains are open to anyone who wants to use them. Anyone can read or write transactions, as well as view the whole blockchain history. In contrast, private blockchains restrict access to a select group of people. Private blockchains allow their members to share data with each other without the need for a central authority.

How Do Mining Nodes Receive Block Rewards?

Mining nodes are the backbone of the blockchain network. They are responsible for processing transactions and securing the network. The mining node reward is given to them in return for their work.

The mining node reward is not static, it depends on how much work a miner has done and how much computing power they have contributed to the network. There are different types of rewards that a miner can get: transaction fees, newly created currency, and mined currency.

What are Smart Contracts?

Smart contracts are computer protocols that facilitate, verify, or enforce the negotiation or performance of a contract.

The term “smart contract” was first introduced by Nick Szabo in 1994.

A smart contract is an agreement between two parties that is verified and enforced digitally.

Application of the blockchain – the decentralized Internet

The decentralized Internet is a peer-to-peer network that does not rely on centralized servers to store content. It also does not use domain names or other traditional internet identifiers to identify the location of the content.

Instead, the decentralized Internet relies on the blockchain for its structure and data storage. The blockchain is a public ledger of transactions that cannot be altered or hacked by anyone. This makes it possible for all computers connected to the decentralized internet to have their own copy of any given piece of information. It also allows the user to control their own data. 

Decentralized Applications (DApps)

DApp.com is a one-stop website dedicated to blockchain, exchanges, tokens, and blockchain apps. It provides a marketplace to showcase different popular Dapps that run on different blockchains such as Ethereum, EOS STEEM, NEO, and TRON. According to DApp.com, \”a decentralized application, also known as a dapp, is an application that runs on a computer P2P network (rather than a single computer or server).\” in 2018, DApps generated $6.5 Billion dollars in transactions. In 2021, the blockchain industry grew sevenfold from 2020.  In 2022, DappRadar states we are entering the year of the metaverse. 

The Metaverse

The metaverse is a virtual reality world that is built on top of the blockchain. It is a shared space where people from all over the world can come together and interact with each other. These interactions include socializing, entertainment, work, and education.

The metaverse is an open-source platform which means that it can be used by anyone who wants to create new worlds or modify existing ones. It also allows for the creation of decentralized applications (DApps) which are applications that have no single point of failure or control. All these features make it a perfect place to invest in as it will only grow in popularity as time progresses.


The blockchain industry has experienced tremendous growth and maturity over the last couple of years. The cryptocurrencies market has taken a hit but the blockchain industry continues to grow. In this article, we explored the Blockchain world and provide some definitions of what is blockchain and how it works. If you have any questions or comments, let me know below. 

Dr. M

Dr. M

2 thoughts on “What is a blockchain?

  1. Hi Dr M

    This article is very Interesting!

    I must confess that I get confused with how bitcoin works and I think this article has help me a bit. I got involved with bitcoin few years back and it did not really work for maybe because they use the term bitcoin to get you to invest but
    It turn out was to bid on shared so since then I’m a bit sceptical with this term. However will watch this closely to determine for myself if it is really the currency of the future

    1. Yes, it is a confusing world out right now because we have cryptocurrency and blockchain. Cryptocurrency requires the blockchain but there are other use cases besides cryptocurrency. The marketplace shifts by the day so companies that exist today don’t necessarily exist tomorrow. It is a fascinating technology and we will see what the future holds.

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