A fork in cryptocurrency occurs when a blockchain’s protocol undergoes a significant change, creating a divergence in the transaction history or rules of the network. Forks happen when developers, miners, or the community disagree on protocol changes and a portion of the network adopts new rules while others continue on the original chain. Understanding forks is important as they can create new assets, change network dynamics, and affect the value of existing holdings.
There are two types: Soft Fork — a backward-compatible upgrade where new rules are a subset of old rules. Nodes that haven’t upgraded can still participate but may not access new features. Bitcoin’s SegWit upgrade (2017) was a soft fork; Hard Fork — a non-backward-compatible change creating a permanent split. Nodes must upgrade or remain on the old chain. If the community is divided, this creates two separate blockchains and two separate coins. Famous hard forks include: Bitcoin Cash (BCH) — forked from Bitcoin in 2017 over block size disputes; Ethereum Classic (ETC) — created when Ethereum hard-forked to reverse the 2016 DAO hack; and Bitcoin SV — forked from Bitcoin Cash in 2018.
When a hard fork creates a new coin, existing holders typically receive equivalent amounts of the new coin — effectively a “free” dividend on their holdings at the fork snapshot date.
Example: In August 2017, Bitcoin hard-forked to create Bitcoin Cash. Every Bitcoin holder at block 478,558 received 1 BCH for every 1 BTC held. At peak BCH price of $4,300 in December 2017, this represented significant value for BTC holders who kept their coins on eligible wallets.
Learn more: Investopedia — Hard Fork vs Soft Fork Explained
