Hard and Soft Forks
If node operators fail to update to the newest version of the Bitcoin software, the blockchain can split or “hard fork”. This split leaves the original blockchain intact, while also creating an alternative version of the original Bitcoin blockchain under new consensus rules. This new blockchain is run by the node operators that updated their software to the newest version. This chain separation causes security issues for the network, as miners and node validators split due to not being able to come to consensus. One of the most controversial forks in Bitcoin’s history created the Bitcoin Cash cryptocurrency.
Alternatively, node software can be updated via soft forks. Soft forks are a way to add new functionality and features to a blockchain, without changing the fundamental consensus rules. The difference between hard forks and soft forks is comparable to a computer’s operating system being upgraded from Windows Vista to Windows 11, versus Windows 11 having a routine system update.
- Bitcoin Improvement Proposals (BIPs) – governance process for updating the Bitcoin codebase
- Cryptocurrency – any digital or virtual form of currency using cryptography to secure transactions
- Hard Fork – a dramatic change to the underlying consensus rules of Bitcoin’s blockchain that results in a blockchain split, one that follows the previous consensus rules and one that follows the new version
- Soft Fork – a method to add new functionality and features to the Bitcoin blockchain, without changing the fundamental consensus rules
Bitcoin/bips: Bitcoin improvement proposals. GitHub. (n.d.). Retrieved March 22, 2022, from https://github.com/bitcoin/bips
Cointelegraph. (2021, November 11). Soft Fork vs. hard fork: Differences explained. Cointelegraph. Retrieved March 22, 2022, from https://cointelegraph.com/blockchain-for-beginners/soft-fork-vs-hard-fork-differences-explained