Fork

A fork in cryptocurrency occurs when there is a divergence in a blockchain's protocol, resulting in a split in the network. There are two types of forks: hard forks and soft forks. A hard fork happens when there is a permanent and incompatible split in the blockchain — nodes running the old software and nodes running the new software can no longer reach consensus, creating two separate chains with a shared history up to the point of the split. Bitcoin Cash is a well-known example of a hard fork from Bitcoin. A soft fork, by contrast, is a backward-compatible change where updated nodes can still communicate with older nodes, allowing the network to upgrade without splitting.

Forks can occur for a variety of reasons. Sometimes they are planned protocol upgrades — Ethereum's transition from Proof-of-Work to Proof-of-Stake involved a series of coordinated hard forks. Other times, forks arise from disagreements within a development community about the future direction of a project. Political disputes over block size, transaction fees, or governance structures have historically led to contentious forks that divide communities and create competing chains.

For traders, forks create interesting dynamics in the market. Leading up to a contentious hard fork, the original chain's price may become volatile as the market speculates on the outcome. If a fork results in a new coin being distributed to existing holders — as happened with Bitcoin Cash — there is often a period of selling pressure on the new asset. Understanding the nature and implications of a fork helps traders anticipate market reactions and position themselves appropriately before and after the event.