Fork (Hard Fork & Soft Fork)
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
A fork is a change to a blockchain's protocol rules. A soft fork is backward-compatible (old nodes still accept new blocks), while a hard fork creates a permanent chain split requiring all nodes to upgrade. Hard forks can create new cryptocurrencies.
A blockchain fork occurs when the network's rules are modified. The two types — soft fork and hard fork — differ in backward compatibility and have dramatically different consequences for users and miners.
A soft fork tightens existing rules in a backward-compatible way. Old nodes that haven't upgraded still accept the new blocks as valid, though they may not understand the new features. Bitcoin's SegWit upgrade in August 2017 was a soft fork: it changed how transaction data was stored but old nodes could still validate blocks. Soft forks require only a majority of miners to upgrade, making them less disruptive.
A hard fork loosens or fundamentally changes rules in a way that old nodes reject. Every node must upgrade or risk following the wrong chain. If a significant portion of the community refuses to upgrade, the chain permanently splits into two separate blockchains with shared history. The most famous hard fork was Ethereum Classic (ETC) splitting from Ethereum (ETH) in July 2016 after The DAO hack, when the community disagreed on whether to reverse $60 million in stolen funds. Bitcoin Cash (BCH) forked from Bitcoin in August 2017 over block size disagreements.
Hard forks can be contentious (community disagreement) or non-contentious (planned upgrades like Ethereum's Shanghai/Capella in April 2023). In contentious forks, holders of the original token receive equal amounts of both tokens — essentially a portfolio event that requires attention to maximize value.
Frequently Asked Questions
Do I get free coins when a hard fork happens?
If you hold the original token before the fork snapshot, you receive equal amounts on both chains. However, you must control your private keys (not on an exchange) to guarantee access. Exchanges may or may not support forks. After the fork, the two tokens are independent — you can sell either or hold both.
What is the difference between a hard fork and a soft fork?
A soft fork is backward-compatible: old nodes still accept new blocks. A hard fork is not backward-compatible: old nodes reject new blocks, potentially creating a permanent chain split. Soft forks are less disruptive; hard forks can create entirely new cryptocurrencies.
Related Terms
Blockchain
A blockchain is a distributed, append-only database where data is organized into linked blocks and secured by cryptography. Once recorded, transactions cannot be altered — making it a trustless, permanent public ledger.
Consensus Mechanism
A consensus mechanism is the method a blockchain uses to achieve agreement among distributed nodes on the valid state of the ledger. The two dominant mechanisms are Proof of Work (Bitcoin) and Proof of Stake (Ethereum, Solana).
Blockchain Node
A blockchain node is a computer that participates in a blockchain network by storing a copy of the ledger, validating transactions, and communicating with other nodes. Nodes collectively maintain the network's decentralization and trustlessness.
Bitcoin (BTC)
Bitcoin is the first and largest cryptocurrency by market cap, created in 2009 by the pseudonymous Satoshi Nakamoto. It functions as a decentralized digital currency and store of value secured by proof-of-work mining.
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