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Crypto Terms:  Letter H

What is Hard Fork (Blockchain)?

Meaning:
Hard Fork (Blockchain) - a massive change to a protocol that happens when a blockchain splits into two blockchains.
medium
2 minutes

Let's find out Hard Fork (Blockchain) meaning, definition in crypto, what is Hard Fork (Blockchain), and all other detailed facts.

A hard fork is an extensive change to a protocol that happens when a blockchain splits into two blockchains and it usually results in the creation of new digital currencies. A hard fork causes permanent changes that are not backward compatible, which means that all nodes must be upgraded because the old version of the software will not operate with the new one.

Even if the transaction history and parameters are identical before the hard fork, the history of both networks separates after the event, and any activity beyond the fork has no impact on the other.

Hard forks can be done intentionally or occur due to bugs or errors in the blockchain. When hard forks are done intentionally, they are announced to the cryptocurrency community in advance. The crypto community widely debates hard forks trying to determine their benefits and drawbacks when changing particular project characteristics (usually rewards and hard cap, block size, or any other).

For example, in 2017, there was a proposal to hard fork Bitcoin to increase its block size from 1 MB to 8 MB. This would change the speed and the amount of the transactions. However, the vast majority of the community opposed this idea and that’s why a part of the community split and created Bitcoin Cash (BCH). 

After that, BCH had a few of its own hard forks that created Bitcoin Cash ABC (BTCA) and Bitcoin SV (BSV). Besides, the latest hard fork, which happened in 2020, created a new chain called Bitcoin Cash Node (BCHN).

Talking about Ethereum, it experienced an unplanned hard fork in 2020 as its developers failed to properly communicate unscheduled changes to their community and infrastructure providers, causing the infrastructure provider Infura to run old and conflicting software. Besides, in 2016, Ethereum suffered a huge hard fork in response to DAO's replay attack, which resulted in the original chain operating as Ethereum Classic.

Cardano_(blockchain_platform)/" target=\"_blank\" rel=\"nofollow noindex noopener\"><strong>Cardano<\/strong><\/a>&nbsp;ecosystem to combine protocols after a <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-hard-fork-blockchain/">hard fork<\/strong><\/a> event.<\/p>\n<p>A hard fork splits one <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-blockchain/">blockchain into two distinguishable protocols which run parallel to each other. The new blockchain branch loses the history of the prior blockchain. A hard fork occurs when new upgrades are implemented into the blockchain. It can modify some of the protocol parameters.<\/p>\n<p>Hard forks may also occur <strong>on the live blockchain<\/strong>, which can compromise the integrity of the network. In 2017, a hard fork occurred on the <a href=https://www.bitdegree.org/"https:////www.bitdegree.org//crypto//buy-bitcoin-btc/">Bitcoin blockchain<\/strong><\/a>, leading to the <strong>chain split<\/strong>. The event had a significant impact on the interests of Bitcoin investors and caused the formation of Bitcoin Cash (BCH).<\/p>\n<p>Hard forks often cause downtime in the blockchain ecosystem which can negatively impact the user experience and disrupt any <strong>ongoing<\/strong> transactions. If a hard fork occurs, the <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-node/">network nodes<\/strong><\/a> are unable to update to the newly set parameters and <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-block-header/">block headers<\/strong><\/strong><\/a> simultaneously, without experiencing system interruptions. The blockchain then has to be taken into downtime.<\/p>\n<p>Although a hard fork may occur on any blockchain, <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-input-output-hong-kong-iohk/">IOHK developed the hard fork combinator as a solution specifically for the <strong>Cardano ecosystem<\/strong>. The hard fork combinator merges both the pre and post-upgrade protocols together to eliminate the possible interruption or restart issues.<\/p>\n<p>With the hard fork combinator, several protocols can appear as a single <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-ledger/">ledger. This <strong>prevents the network nodes from having to update<\/strong> to the new blockchain simultaneously.<\/p>\n<p>In July 2020, Cardano received upgrades, moving from the wallet-only Byron protocols to proof-of-stake-supported Shelley protocols. During the upgrade, the utility of the blockchain was altered by the hard fork.<\/p>\n<p>This was a <strong>risky procedure<\/strong>, as Cardano contained over 1 million <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-wallet/">wallets at the time. Any issues with the hard fork execution could have been detrimental to the Cardano ecosystem as a whole.<\/p>\n<p>The <strong>Byron-to-Shelley transition was successfully completed<\/strong> on 29 July 2020, at 21:45 UTC. Users received notice about the ongoing upgrade. However, the use of the Cardano function was not restricted and the hard fork processes were completed in the background. This allowed the network nodes to transition between protocols sequentially.<\/p>\n<p>Thanks to the <strong>hard fork combinator<\/strong>, the Cardano blockchain has been able to maintain both Byron and Shelley blocks. The tool will be implemented in future upgrades to support the transitional process.<\/p>","definition":"a tool used to combine protocols on the Cardano blockchain if a hard fork has occurred.","status":"published","meta_title":"What is Hard Fork Combinator? Definition & Meaning | Crypto Wiki","meta_description":"Hard Fork Combinator meaning: Hard Fork Combinator - a tool used to combine protocols on the Cardano blockchain if a hard fork has occurred.","meta_keywords":null}" :prev-section="{"id":382,"wikipedia_url":"https:\/\/en.wikipedia.org\/wiki\/Supply_(economics)","level":"easy","author_id":1,"created_at":"2023-06-19T06:58:59.000000Z","updated_at":"2023-12-08T05:19:13.000000Z","slug":"what-is-hard-cap","title":"What is Hard Cap?","section":"H","keyword":"Hard Cap","content":"<p>A hard cap is the absolute maximum supply limit of a particular <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-cryptocurrency/">cryptocurrency placed by the blockchain&rsquo;s code. A hard cap prevents<strong> the further circulation<\/strong> and creation of its units. This way it creates scarcity which drives up the value of each <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-token/">token. This limit can be <strong>bypassed<\/strong> by changing the parameters of a cryptocurrency which eventually results in the creation of a new cryptocurrency.<\/p>\n<p>A hard cap is strictly supervised by crypto analytics websites and the communities of specific projects. However, it can be changed when <strong>an error occurs in the code<\/strong>, a malicious action happens or when the developers need to change it for some specific situations. One of the bigger hard cap breaches occurred in <a href=https://www.bitdegree.org/"https:////www.bitdegree.org//crypto//buy-bitcoin-btc/">Bitcoin when the <strong>184M inflation bug<\/strong> appeared in code and broke the 21M limit.<\/p>\n<p>As mentioned before, hard caps help to raise the value of tokens. A great example of that would be when the MEME token (created as a satire in <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-defi/">DeFi and <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-non-fungible-token-nft/">NFT industry) exploded in value thanks to its small hard cap of only 28,000 tokens. Also, in 2020, the <strong>YFI governance token<\/strong> raised its value to over $40,000 mostly thanks to its small hard cap of 30,000 tokens.<\/p>","definition":"the absolute maximum supply limit of a particular cryptocurrency.","status":"published","meta_title":"What is Hard Cap? Definition & Meaning | Crypto Wiki","meta_description":"Hard Cap meaning: Hard Cap - the absolute maximum supply limit of a particular cryptocurrency.","meta_keywords":null}" :model="{"id":384,"wikipedia_url":"https:\/\/en.wikipedia.org\/wiki\/Fork_(blockchain)#Hard_fork","level":"medium","author_id":1,"created_at":"2023-06-19T06:58:59.000000Z","updated_at":"2023-12-08T07:15:25.000000Z","slug":"what-is-hard-fork-blockchain","title":"What is Hard Fork (Blockchain)?","section":"H","keyword":"Hard Fork (Blockchain)","content":"<p><strong>A hard fork<\/strong> is an extensive change to a protocol that happens when a <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-blockchain/">blockchain splits into two blockchains and it usually results in the creation of new <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-digital-currency/">digital currencies<\/strong><\/a>. A hard fork causes <strong>permanent changes<\/strong> that are not backward compatible, which means that all <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-is-node/">nodes must be upgraded because the old version of the software will not operate with the new one.<\/p>\n<p>Even if the transaction history and parameters are identical before the hard fork, the history of both networks separates after the event, and <strong>any activity beyond the fork has no impact on the other.<\/strong><\/p>\n<p>Hard forks can be done intentionally or occur due to bugs or errors in the blockchain. When <strong>hard forks<\/strong> are done intentionally, they are announced to the cryptocurrency community in advance. The crypto <strong>community<\/strong> widely debates hard forks trying to determine their benefits and drawbacks when changing particular project characteristics (usually rewards and hard cap, block size, or any other).<\/p>\n<p>For example, in 2017, there was a proposal to hard fork <a href=https://www.bitdegree.org/"https:////www.bitdegree.org//crypto//buy-bitcoin-btc/">Bitcoin to <strong>increase its block size from 1 MB to 8 MB<\/strong>. This would change the speed and the amount of the transactions. However, the vast majority of the community opposed this idea and that&rsquo;s why a part of the community split and created Bitcoin Cash (BCH).&nbsp;<\/p>\n<p>After that, <strong>BCH<\/strong> had a few of its own hard forks that created Bitcoin Cash ABC (BTCA) and Bitcoin SV (BSV). Besides, the latest hard fork, which happened in 2020, created a new chain called <strong>Bitcoin Cash Node (BCHN).<\/strong><\/p>\n<p>Talking about <a href=https://www.bitdegree.org/"https:////www.bitdegree.org//crypto//buy-ethereum-eth/">Ethereum, it experienced an unplanned hard fork in 2020 as its developers <strong>failed to properly communicate unscheduled changes<\/strong> to their community and infrastructure providers, causing the infrastructure provider <strong>Infura<\/strong> to run old and conflicting software. Besides, in 2016, Ethereum suffered a huge hard fork in response to <a href=https://www.bitdegree.org/"//crypto//learn//crypto-terms//what-are-decentralized-autonomous-organizations-dao/">DAO's replay attack, which resulted in the original chain operating as <strong>Ethereum Classic.<\/strong><\/p>","definition":"a massive change to a protocol that happens when a blockchain splits into two blockchains.","status":"published","meta_title":"What is Hard Fork (Blockchain)? Definition & Meaning | Crypto Wiki","meta_description":"Hard Fork (Blockchain) meaning: Hard Fork (Blockchain) - Hard Fork \u2013 a massive change to a protocol that happens when a blockchain splits into two blockchains.","meta_keywords":null,"author":{"id":1,"user_id":1,"created_at":"2023-05-03T14:30:55.000000Z","updated_at":"2023-05-11T07:18:20.000000Z","title":"Editor-In-Chief","slug":"aaron-s-editor-in-chief","description":"<p>Having completed a Master&rsquo;s degree on Economics, Politics &amp; Culture for the East Asia region, Aaron has written scientific papers with a comparative analysis of the differences between US&rsquo; Western and Japan&rsquo;s Collective forms of capitalism, 1945-2020.<\/p>\n<p>With close to a decade of experience in the FinTech industry, Aaron understands all of the biggest issues and struggles that crypto enthusiasts face. He&rsquo;s a passionate analyst who is concerned with data-driven and fact-based content, as well as that which speaks to both Web3 natives and industry newcomers.<\/p>\n<p>Aaron is the go-to person for everything and anything related to digital currencies. With a huge passion for blockchain &amp; Web3 education, Aaron strives to transform the space as we know it, and make it more approachable to complete beginners.<\/p>\n<p>Aaron has been quoted by multiple established outlets, and is a published author himself. Even during his free time, he enjoys researching the market trends, and looking for the next supernova.<\/p>","user":{"id":1,"first_name":"Aaron","last_name":"S.","email":"aaron@bitdegree.org","email_sanitized":"aaron@bitdegree.org","email_verified_at":"2023-12-01T09:40:20.000000Z","must_verify_email":false,"is_registered_with_wallet":false,"status":"active","country":"LT","last_connected_ip":"88.119.132.125","image_id":2641,"referral_token":"05TMu2NysXOCn525","referred_by":null,"created_at":"2023-05-03T14:30:55.000000Z","updated_at":"2024-01-09T15:22:21.000000Z","full_name":"Aaron S."}}}" :chapter-list="[{"id":1,"title":"Blockchain","slug":"blockchain","updated":null,"chapter":"crypto\/assets\/crypto-book\/chapters\/learn-blockchain.jpg","chapter_simple":"crypto\/assets\/crypto-book\/chapters-simple\/blockchain-101.jpg","rating":100,"sections":[{"chapter_id":1,"order":1,"slug":"what-is-blockchain","title":"What is the Blockchain?","status":"published","modified_content":null},{"chapter_id":1,"order":2,"slug":"decentralized-blockchain","title":"Anonymous & Decentralized Blockchains: The Cornerstone of Crypto","status":"published","modified_content":null},{"chapter_id":1,"order":3,"slug":"blockchain-transaction","title":"What is a Blockchain Transaction in Crypto?","status":"published","modified_content":null},{"chapter_id":1,"order":4,"slug":"crypto-fees","title":"The Different Types of Crypto Fees Explained","status":"published","modified_content":null},{"chapter_id":1,"order":5,"slug":"what-is-bridging-in-crypto","title":"The Key Notion Behind the Concept of Bridging in Crypto","status":"published","modified_content":null},{"chapter_id":1,"order":6,"slug":"types-of-blockchains","title":"Different Types of Blockchains: What to Look Out For?","status":"published","modified_content":null}]},{"id":2,"title":"Cryptocurrencies","slug":"cryptocurrencies","updated":null,"chapter":"crypto\/assets\/crypto-book\/chapters\/learn-cryptocurrencies.jpg","chapter_simple":"crypto\/assets\/crypto-book\/chapters-simple\/cryptocurrencies-101.jpg","rating":100,"sections":[{"chapter_id":2,"order":1,"slug":"what-is-a-cryptocurrency","title":"What is a Cryptocurrency?","status":"published","modified_content":null},{"chapter_id":2,"order":2,"slug":"how-does-cryptocurrency-work","title":"How Does Cryptocurrency Work?","status":"published","modified_content":null},{"chapter_id":2,"order":3,"slug":"is-cryptocurrency-a-good-investment","title":"Is Cryptocurrency a Good Investment? 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Cryptocurrencies?","status":"published","modified_content":null},{"chapter_id":7,"order":2,"slug":"how-to-invest-in-crypto","title":"Investing in Crypto: What Investing Options Do You Have?","status":"published","modified_content":null},{"chapter_id":7,"order":3,"slug":"ico-vs-ido","title":"ICO vs IDO vs IEO: Which One is the One?","status":"published","modified_content":null},{"chapter_id":7,"order":4,"slug":"what-is-an-airdrop","title":"What are Crypto Airdrops and How to Get Them?","status":"published","modified_content":null},{"chapter_id":7,"order":5,"slug":"how-to-get-free-crypto","title":"How to Get Free Crypto Assets?","status":"published","modified_content":null},{"chapter_id":7,"order":6,"slug":"how-to-arbitrage-crypto","title":"What is Crypto Arbitrage: The Main Principles","status":"published","modified_content":null},{"chapter_id":7,"order":7,"slug":"what-is-a-perpetual-contract","title":"Perpetual Contracts: Futures Contracts Without an Expiration 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