Hard Fork
CryptoGlossary term
Definition
A permanent change to a blockchain's protocol that creates a completely separate chain, making previously invalid blocks and transactions valid or vice versa. Hard forks require all nodes and users to upgrade to the new software, and those who don't will remain on the old chain. Famous examples include Bitcoin Cash forking from Bitcoin and Ethereum Classic resulting from a hard fork of Ethereum.
Related terms
- Soft ForkA backward-compatible change to a blockchain's protocol where only previously valid transactions are made invalid, allowing non-upgraded nodes to still function on the network. Unlike a hard fork, a soft fork does not create a separate blockchain and typically requires only a majority of miners or validators to upgrade. Soft forks are generally considered less disruptive and are used for smaller protocol improvements.
- BlockchainA distributed digital ledger that records transactions across a network of computers in a way that makes the data nearly impossible to alter retroactively. Each block contains a set of transactions and is cryptographically linked to the previous block, forming a chain. This technology provides transparency, security, and decentralization without requiring a central authority.
- EthereumA decentralized blockchain platform that enables developers to build and deploy smart contracts and decentralized applications (dApps). Unlike Bitcoin, which primarily serves as a digital currency, Ethereum provides a programmable platform powered by its native cryptocurrency, Ether (ETH). It transitioned from Proof of Work to Proof of Stake in 2022 to improve energy efficiency and scalability.
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