What is a blockchain?

They are more than a chain of blocks - we explore the basics of blockchains.

What is a blockchain?

If you’ve been following the world of cryptocurrencies, then you’ve probably heard about blockchains. But what exactly are they, and how do they work?

In this article, we’ll explore the basics of blockchains, their applications in DeFi, and their potential for mass adoption.

What is a Blockchain?

At its core, a blockchain is simply a decentralized ledger of transactions. Unlike traditional ledgers, which are typically controlled by a single entity (like a bank), a blockchain is distributed across a network of computers. This makes it more secure since there’s no single point of failure.

The first and most well-known application of blockchain technology is Bitcoin. Bitcoin was created in 2008 by an anonymous person using the pseudonym Satoshi Nakamoto. The goal of Bitcoin was to create a decentralized digital currency that could be used for online transactions without the need for intermediaries like banks.

How Does a Blockchain Work?

A blockchain is made up of blocks of data, each of which contains a number of transactions. When a transaction is made, it’s added to a block. Once the block is full, it’s added to the chain of previous blocks, creating a permanent record of all the transactions that have ever taken place on the network.

Each block in the chain contains a unique code (called a hash) that’s based on the contents of the block. This hash is used to link the block to the previous block in the chain, creating a chain of blocks that’s impossible to alter without changing the entire chain.

The decentralized nature of a blockchain means that no single entity has control over the network. Instead, the network is maintained by a group of users (called nodes) who are incentivized to keep the network running by being rewarded with cryptocurrency.

Applications of Blockchain in DeFi

DeFi (short for decentralized finance) is a term used to describe a growing ecosystem of financial applications built on blockchain technology. These applications aim to provide traditional financial services (like lending and borrowing) in a decentralized, trustless way.

One of the most popular applications of blockchain in DeFi is the creation of stablecoins. Stablecoins are cryptocurrencies that are pegged to the value of a stable asset (like the US dollar), providing a stable store of value that can be used for transactions.

Another popular DeFi application is decentralized exchanges (DEXs). DEXs allow users to trade cryptocurrencies without needing a centralized exchange, reducing the risk of hacking and other security breaches.


Blockchain technology can potentially revolutionise how we think about money and financial transactions. By creating a decentralized, trustless system that’s resistant to censorship and fraud, blockchains could provide a more secure and transparent alternative to traditional financial systems.

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