Blockchain Fork

A blockchain fork is a divergence in the chain's history that occurs when the network cannot agree on a single state. This can happen due to protocol updates, bugs, or intentional adversarial attempts to create competing chains.

When a fork occurs, nodes may end up following different versions of the ledger, leading to potential confusion and fragmentation of the network. While some forks are planned upgrades, others are unplanned and can cause significant instability.

Managing forks requires clear communication and coordination among developers, validators, and users. The ability of a protocol to handle forks gracefully is a measure of its governance and technical maturity.

It is a fundamental feature of the open and permissionless nature of blockchain technology.