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  1. Home
  2. /Glossary
  3. /Hard Fork
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blockchain

Hard Fork

A permanent, backward-incompatible change to a blockchain's rules that creates a split.

Definition

A permanent, backward-incompatible change to a blockchain's rules that creates a split. Nodes that don't upgrade end up on a separate chain. Ethereum Classic was born from a hard fork after the DAO hack, and Bitcoin Cash split from Bitcoin over a block size disagreement.

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Related Terms

Fork

A change to a blockchain's protocol that creates a new version.

Protocol

A set of rules governing how a network or application operates.

Consensus Mechanism

The method a blockchain uses to agree on which transactions are valid and in what order.

ABI

Application Binary Interface.

Account Abstraction

A way to make crypto wallets behave more like normal apps by turning every account into a smart contract.

ERC-4337

The Ethereum standard for account abstraction without changing the core protocol.

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