IFC Markets
Questrade - Empowering you to take control of your financial future. Join the journey!

What is a fork in Cryptocurrency?​

Understanding Crypto Forks: A Comprehensive Guide to Blockchain Evolutions

In the world of traditional finance, if a bank wants to update its software, it happens behind the scenes. You might notice a slightly different interface on your mobile app the next morning, but the underlying system remains the same.

In the decentralized world of Cryptocurrency, things work differently. Because there is no central authority to dictate changes, updates and disagreements are handled through a process called a fork.

Whether you’re a seasoned trader or a curious newcomer, understanding forks is essential to navigating the crypto landscape. Here is everything you need to know about what a fork is, why it happens, and how it impacts the market.

What is a Fork?

At its simplest level, a fork occurs when a blockchain’s software is updated or modified.

Think of a blockchain as a digital "rulebook" that every computer (node) in the network must follow to agree on which transactions are valid. A fork happens when those rules change. Depending on how the rules are changed, the network either stays together or splits into two separate paths.

The term "fork" comes from the idea of a "fork in the road." One path continues on the original route, while another path diverges toward a new destination.

The Two Main Types: Soft Forks vs. Hard Forks

Not all forks are created equal. They generally fall into two categories: Soft Forks and Hard Forks.

1. Soft Forks (The "Backward Compatible" Update)

A soft fork is a software update that is backward compatible. This means that nodes that haven't updated to the new software can still communicate with nodes that have.

  • The Analogy: Imagine you are writing a document in Microsoft Word 2023, but your friend is using Word 2018. If you save the file in a way that your friend can still open and read it, that’s essentially a soft fork.
  • How it works: The new rules are usually more restrictive than the old ones. Because the new blocks are still recognized by the old software, the network doesn't split.

2. Hard Forks (The "Great Divide")

A hard fork is a permanent divergence from the previous version of the blockchain. It is not backward compatible. After a hard fork, the old version and the new version are completely separate.

  • The Analogy: This is like upgrading from a Playstation 3 to a Playstation 5. You can’t play PS5 discs on a PS3 console. The systems are fundamentally different.
  • How it works: If a group of developers decides to change the core protocol (like increasing the block size), the nodes that don't upgrade will no longer recognize the new transactions. This results in the blockchain splitting into two: the original chain and the new chain.

Why Do Forks Happen?

Forks are rarely accidental; they are usually the result of a conscious choice by developers or the community. There are three primary reasons a fork occurs:

1. Feature Upgrades and Scalability
As technology evolves, blockchains need to get faster and more efficient. For example, Bitcoin’s SegWit update was a soft fork designed to help the network handle more transactions per second.

2. Correcting Security Breaches
If a major hack occurs, the community may decide to "roll back" the blockchain to a point before the theft happened. This is a controversial move because it goes against the "immutability" of crypto, but it has happened in extreme cases.

3. Philosophical Disagreements
Because crypto is decentralized, the community doesn't always agree on the future of the project. If a group of developers feels the current path is wrong, they may initiate a hard fork to create their own version of the coin that reflects their vision.

Famous Examples of Crypto Forks

You have likely seen the results of forks without even realizing it. Some of the biggest names in crypto were born from these splits:
​
  • Bitcoin vs. Bitcoin Cash (2017): This was a hard fork born from a disagreement over "block size." One group wanted larger blocks to make transactions faster and cheaper. When the community couldn't agree, Bitcoin Cash (BCH) was created as a separate entity from Bitcoin (BTC).
  • Ethereum vs. Ethereum Classic (2016): After a major hack of "The DAO" (a decentralized investment fund), the Ethereum community split. One group wanted to reverse the hack (the current Ethereum), while the other argued that "code is law" and the blockchain should never be altered (Ethereum Classic).
  • The Ethereum Merge (2022): This was a massive technical upgrade that moved Ethereum from Proof of Work to Proof of Stake. While it was a highly coordinated "upgrade," it technically functioned as a hard fork to transition the entire network to a new consensus mechanism.

What Do Forks Mean for Investors?

If you hold a cryptocurrency that undergoes a hard fork, one of two things usually happens:

  1. "Free" Coins: In many hard forks, if you hold the original coin, you are granted an equal amount of the new coin on the new chain. For example, when Bitcoin Cash launched, Bitcoin holders received an equal amount of BCH automatically.
  2. Volatility: Forks often lead to significant price swings as the market decides which version of the coin is more valuable.
  3. Confusion: For beginners, forks can be confusing. It’s important to ensure your coins are held in a wallet or on an exchange that supports the fork if you want to claim your "new" assets.

The Bottom Line

Forks are a natural part of the evolution of decentralized finance. They represent the "democracy" of the blockchain—where developers, miners, and users have the power to decide the future of the technology.

While they can be technically complex and sometimes politically charged, forks are ultimately the mechanism that allows cryptocurrency to grow, adapt, and survive in an ever-changing digital world.