What is a Hard Fork? A Beginner's Guide to Blockchain Upgrades

A hard fork is a significant change to the protocol of a blockchain network that makes previously invalid blocks or transactions valid, or vice versa. This often results in the creationa of two separate versions of a blockchain. In this article, we'll explain what a hard fork is, how it works, and why it happens. We'll also look at famous examples, such as the Bitcoin Cash fork, and discuss the implications for blockchain networks, investors, and the broader cryptocurrency ecosystem