[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"mining-farm-info":3,"glossary-related-en-chain-reorganization":7,"glossary-term-en-chain-reorganization":38},{"data":4},{"fpps":5,"btc_rate":6},4.3e-7,94967.34,{"items":8},[9,15,21,27,33],{"id":10,"slug":11,"term":12,"shortDefinition":13,"firstLetter":14},"cadf5b39-cdc4-49d3-8a1c-d6a71d11ea48","pool-centralization","Pool Centralization","Pool centralization refers to the concentration of mining power in a few large mining pools, leading to reduced decentralization in the Bitcoin network. When a small number of pools control a significant portion of the network’s hashrate, they can potentially exert influence over block production, transaction validation, and other aspects of the network. High pool centralization can undermine the principles of decentralization.","P",{"id":16,"slug":17,"term":18,"shortDefinition":19,"firstLetter":20},"34e79dd2-af51-443e-8ea8-643611a81033","block","Block","A block is a unit of data in a blockchain that contains a group of verified transactions, along with a timestamp and a reference to the previous block. Blocks are added to the blockchain through mining and are secured using cryptographic hashing and tamper-resistant chain of records.\n","B",{"id":22,"slug":23,"term":24,"shortDefinition":25,"firstLetter":26},"324ebea0-0043-4d80-b2ce-9f153c4cee39","mining-variance","Mining Variance","Mining variance refers to the statistical fluctuations in the number of blocks a miner is likely to find over a period of time. Because mining is a probabilistic process, there is always a level of uncertainty in how often a miner will find a block. ","M",{"id":28,"slug":29,"term":30,"shortDefinition":31,"firstLetter":32},"b629f53f-5dba-4dc0-b655-16f1f17682bd","firmware","Firmware","Firmware is a type of software that is embedded into hardware devices like Bitcoin miners to control their operations. In the context of mining hardware (such as ASIC miners), firmware manages the device’s basic functions, including the mining algorithm, power management. ","F",{"id":34,"slug":35,"term":36,"shortDefinition":37,"firstLetter":14},"339c4eda-a8de-4aaa-9a21-1c5687a85fb5","pool-server","Pool Server","A pool server in Bitcoin mining is a server that manages communication between miners and mining pools. It distributes mining tasks to connected miners, collects the results (shares) submitted by miners, and communicates the pool’s mining work. The pool server also handles reward distribution, ensuring that miners receive their share of the pool’s earnings once a block is successfully mined.",{"term":39},{"id":40,"locale":41,"slug":42,"term":43,"h1":43,"shortDefinition":44,"simpleExplanationHtml":45,"howItWorksHtml":46,"exampleHtml":47,"contentHtml":48,"aliases":49,"abbreviations":50,"algorithms":51,"faq":52,"seoTitle":71,"seoDescription":72,"status":73,"publishedAt":74,"updatedAt":75},"c95715ba-286d-4543-9c7b-161f82d440f4","en","chain-reorganization","Chain Reorganization","A chain reorganization is a situation where a blockchain network replaces part of its current blockchain history with a different valid chain that has more accumulated work or stronger consensus support. In Bitcoin, chain reorganizations usually happen when two miners produce blocks at nearly the same time, temporarily creating competing versions of the blockchain.","\u003Ch2>\u003Cstrong>Chain Reorganization Explained in Simple Terms\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>A chain reorganization happens when the blockchain briefly splits into two possible versions and the network later decides which version becomes the official chain.\u003C\u002Fp>\u003Cp>In Bitcoin:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>miners may sometimes find blocks simultaneously\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>different nodes may temporarily see different chains\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>eventually one chain becomes longer\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>the network switches to the longer valid chain\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Blocks removed from the rejected chain become orphaned or stale blocks.\u003C\u002Fp>","\u003Ch2>\u003Cstrong>How Chain Reorganization Works\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Chain reorganizations are part of normal blockchain behavior in Proof of Work systems.\u003C\u002Fp>\u003Cp>Here’s how it works:\u003C\u002Fp>\u003Col>\u003Cli>\u003Cp>\u003Cstrong>Two Blocks Are Found\u003Cbr \u002F>\u003C\u002Fstrong> Two miners discover valid blocks at almost the same time.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>Temporary Blockchain Split\u003Cbr \u002F>\u003C\u002Fstrong> Some nodes accept Block A first, while others accept Block B first.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>Competing Chains Exist\u003Cbr \u002F>\u003C\u002Fstrong> Two versions of the blockchain temporarily exist.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>Next Block Is Mined\u003Cbr \u002F>\u003C\u002Fstrong> One chain receives another valid block before the other.\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>\u003Cstrong>Longest Chain Wins\u003Cbr \u002F>\u003C\u002Fstrong> Nodes switch to the chain with the most accumulated Proof of Work.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Fol>\u003Cp>Bitcoin follows this rule:\u003C\u002Fp>\u003Cp>Valid Chain=Chain With Most Accumulated \u003C\u002Fp>\u003Col>\u003Cli>\u003Cp>\u003Cstrong>Old Chain Is Replaced\u003Cbr \u002F>\u003C\u002Fstrong> Transactions from removed blocks return to the mempool if not included elsewhere.\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Fol>\u003Ch2>\u003Cstrong>Why Chain Reorganizations Happen\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Chain reorganizations occur because blockchain networks are decentralized and block propagation takes time.\u003C\u002Fp>\u003Cp>Common causes include:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>simultaneous block discovery\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>network latency\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>mining competition\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>temporary node desynchronization\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Small reorganizations of 1–2 blocks are relatively normal in Proof of Work networks.\u003C\u002Fp>","\u003Ch2>\u003Cstrong>Example of a Chain Reorganization\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Imagine:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>Miner A finds Block 800001\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Miner B also finds Block 800001 at nearly the same moment\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Some nodes receive Miner A’s block first.\u003Cbr \u002F> Other nodes receive Miner B’s block first.\u003C\u002Fp>\u003Cp>Now two chains temporarily exist.\u003C\u002Fp>\u003Cp>Later:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>another miner builds on Miner B’s chain\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Miner B’s chain becomes longer\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>The network reorganizes:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>nodes switch to Miner B’s chain\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Miner A’s block becomes stale\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Ch2>\u003Cstrong>Chain Reorganization and Confirmations\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Transaction confirmations help protect against reorganization risk.\u003C\u002Fp>\u003Cp>A transaction with:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>1 confirmation → small reorg risk\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>6 confirmations → much lower reorg risk\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>As additional blocks are added:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>reorganizing the chain becomes exponentially more difficult\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>\u003C\u002Fp>","\u003Ch2>\u003Cstrong>Deep Chain Reorganizations\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Most reorganizations are small.\u003C\u002Fp>\u003Cp>A deep reorganization affects many blocks and may indicate:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>network attacks\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>severe consensus failures\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>51% attacks\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>Deep reorganizations are rare in large networks like Bitcoin.\u003C\u002Fp>\u003Ch2>\u003Cstrong>Chain Reorganization vs Hard Fork\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cimg src=\"https:\u002F\u002Fs3.ecos.am\u002Fwp.files\u002Fglossary\u002Fuploads\u002F2026\u002F06\u002Fen\u002F14-25c9ef00.png\" alt=\"14\" title=\"14\" class=\"glossary-image glossary-image--center\" loading=\"lazy\" decoding=\"async\" \u002F>\u003Ch2>\u003Cstrong>How Chain Reorganizations Affect Miners\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>When a miner’s block becomes stale:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>the block reward is lost\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>mining work becomes wasted\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>This is why miners try to propagate new blocks quickly across the network.\u003C\u002Fp>\u003Ch2>\u003Cstrong>Chain Reorganization and Double Spending\u003C\u002Fstrong>\u003C\u002Fh2>\u003Cp>Attackers may attempt to exploit reorganizations for double-spending attacks.\u003C\u002Fp>\u003Cp>A malicious miner with significant hashrate could:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>spend coins on one chain\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>secretly mine another chain\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>release the alternative chain later\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>If the malicious chain becomes longer:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>the original transaction may disappear\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>This is one reason exchanges often wait for multiple confirmations.\u003C\u002Fp>",[],[],[],[53,56,59,62,65,68],{"answer":54,"question":55},"A chain reorganization happens when the blockchain replaces part of its history with a different valid chain that has more accumulated Proof of Work.","What is a chain reorganization?",{"answer":57,"question":58},"They usually happen when two miners find valid blocks at nearly the same time, temporarily creating competing chains.","Why do chain reorganizations happen?",{"answer":60,"question":61},"Yes. Small reorganizations of one or two blocks are a normal part of decentralized blockchain operation.","Are chain reorganizations normal in Bitcoin?",{"answer":63,"question":64},"Transactions from removed blocks may return to the mempool if they are not included in the winning chain.","What happens to transactions during a reorganization?",{"answer":66,"question":67},"Bitcoin nodes follow the chain with the most accumulated Proof of Work as the valid blockchain.","What is the longest chain rule?",{"answer":69,"question":70},"Yes. Large or malicious reorganizations can potentially reverse transactions and enable double-spending attacks.","Can chain reorganizations cause double spending?"," Chain Reorganization in Blockchain: Definition and How It Works","What is a chain reorganization in blockchain? Learn how temporary blockchain splits happen, why nodes switch to longer chains, and how chain reorganizations affect Bitcoin transactions and mining","published","2026-06-03T17:40:45.103Z","2026-06-03T17:40:41.608Z"]