A fork is a change or update to the rules of a blockchain protocol that can affect how the network operates. It occurs when the blockchain splits into two versions, either temporarily or permanently, due to differences in software or consensus rules. Forks are often used to improve the network, fix issues, or introduce new features.
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A fork changes the rules of a blockchain and can split the network into different versions.
A hard fork is a major change to the blockchain that is not backward compatible, meaning that nodes running the old version cannot validate blocks created under the new rules. This can result in a permanent split of the blockchain if not all participants upgrade, creating two separate networks with their own transaction history and rules. Hard forks are often used to introduce significant upgrades or to resolve disagreements within the community, but they can also create uncertainty and division among users and developers.
A soft fork is a backward compatible update to the blockchain, meaning that nodes running the old version can still recognize and accept blocks created by updated nodes. This allows the network to remain unified, as only a majority of participants need to adopt the new rules for them to be enforced. Soft forks are typically used for smaller upgrades or improvements and are generally less disruptive than hard forks, although they still require coordination within the network.
Short example:
Suppose a blockchain introduces an update to its network rules.
If this update is not compatible with the old version and not all users upgrade, the network splits into two separate blockchains, which is an example of a hard fork.
If instead the update remains compatible with the old rules, the network continues as one system even if some users do not upgrade, which is an example of a soft fork.
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