What is a Hard Fork in Crypto? Understanding Blockchain Splits

The world of cryptocurrency is filled with terms that might seem confusing for newcomers. Among them is the concept of a “hard fork.” If you’re new to crypto or just want to understand the term better, you’re in the right place. 

In short, a hard fork is an essential feature of how certain blockchain networks evolve and even create entirely new cryptocurrencies. But what does it mean for the blockchain to “fork,” and why does it happen? Let’s dive into the details.

What Is a Blockchain Fork?

At its core, a blockchain fork occurs when there is a divergence in the blockchain’s protocol, leading to two separate paths. Imagine a road splitting into two distinct routes, each with its own destination. This is how a fork works in crypto: a blockchain divides into two chains that both share the same history up to a certain point but then evolve independently. These two paths may carry on the same vision or take different approaches, creating opportunities (or challenges) for developers, users, and investors.

Hard forks are common in the world of cryptocurrency, especially with popular networks like Bitcoin. For instance, projects like bitcoinhyper.com, which aim to enhance Bitcoin’s scalability by offering cheaper and quicker transactions, are built on innovative concepts related to hard forking.

Hard Forks vs. Soft Forks: What’s the Difference?

A blockchain can fork in two ways: hard or soft. The key difference lies in how the blockchain diverges and how the community reacts.

A soft fork is more of a subtle change to the existing protocol, like an update or a tweak to the system. With soft forks, there’s no break in the chain, and all nodes (computers that maintain the blockchain) stay in sync under the new rules. The upgrade is accepted by most of the community, and everything continues smoothly.

In contrast, a hard fork is a more significant change. It creates a split, where the blockchain branches off into two separate chains. This happens when there’s a fundamental disagreement in the community or when a major update is needed. Nodes that don’t upgrade to the new protocol cannot recognise the new blocks added, making them incompatible with the rest of the network. As a result, two distinct versions of the blockchain (and often two different cryptocurrencies) come into existence.

Why Do Hard Forks Happen?

Hard forks happen for one of two basic reasons: a fundamental disagreement in the community or to solve a technical or security issue.

1. Community disagreement: A hard fork can be caused by a split in the community regarding the direction of a blockchain. For example, in Bitcoin’s history, there was a time when the community split regarding the ideal block size. Developers of Bitcoin XT, for example, wanted to increase the block size to complete transactions faster, while others were afraid that this move would compromise decentralisation. This eventually led to the hard fork called Bitcoin Cash (BCH), Bitcoin’s hard fork. 
2. Security or upgrades: A hard fork can also be performed to deal with a security exploit or serious vulnerability. For example, in 2016, when The DAO (Decentralised Autonomous Organisation) was hacked on the Ethereum network, the Ethereum community decided to hard fork to effectively reverse the hack and return around 3.6 million ETH to investors. This hard fork created two chains: Ethereum (ETH) and Ethereum Classic (ETC).

The Role of Hard Forks in Creating New Cryptocurrencies

The most significant result of a hard fork is the potential creation of a whole new cryptocurrency. It’s common in a forked blockchain that both chains will create their own native token. This is the reason why Bitcoin Cash is still a thing and operates separately from Bitcoin. 

A hard fork is often seen as an opportunity to create another version of a cryptocurrency that solves the same issues as its original, like transaction speed or scalability. However, a hard fork isn’t guaranteed to produce a new coin. In a lot of cases, newer coins launched in a hard fork fail to grow a decentralized community or gain wider adoption.

How Hard Forks Affect Crypto Holders

For cryptocurrency holders, such as Bitcoin, a hard fork could also mean that they just received a new token. For instance, if you held your Bitcoin when it was split, creating Bitcoin Cash, you would receive one BCH for every BTC. While on the surface this may seem appealing, this doesn’t guarantee that the new token will have lasting value. In fact, most hard forks only produce new coins that are worth a limited amount of time.

For investors, it is essential to remember that not all new coins produced by a hard fork will be worth anything just because they are produced by a hard fork. The market ultimately decides if the new cryptocurrency experiences growth or if it dies. Forks may lead to higher volatility and risk for crypto investors.

Hard Forks and the Future of Crypto

The maturity of the blockchain ecosystem is moving along, and hard forks will continue to play a large part in the evolution of their ecosystems. Hard forks offer developers and communities the chance to explore new ideas, fix problems, or mitigate security issues, but they can also create confusion for traders and investors.  Hard forks can create confusion, especially when multiple coins emerge from the same network or when they cause a divide in the community.

What we do know is that forks are not going to disappear; they will be a constant in the cryptocurrency ecosystem going forward and will bring opportunities and challenges. For crypto investors, understanding what a hard fork is and how a hard fork can affect the value of their virtual goods is important in navigating the changes in the digital assets ecosystem.