[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"glossary-term-en-hash":3,"glossary-related-en-hash":38},{"term":4},{"id":5,"locale":6,"slug":7,"term":8,"h1":8,"shortDefinition":9,"simpleExplanationHtml":10,"howItWorksHtml":11,"exampleHtml":12,"contentHtml":13,"aliases":14,"abbreviations":15,"algorithms":16,"faq":17,"seoTitle":33,"seoDescription":34,"status":35,"publishedAt":36,"updatedAt":37},"472268cf-ad8b-4f8e-bfd9-765eeab0c981","en","hash","Hash","A hash is a fixed-length string of characters generated by applying a cryptographic function to input data. Hashes uniquely represent transactions. Even a small change in the input produces a completely different hash, making it essential for security in Bitcoin mining and block validation.","\u003Cp>A hash is like a digital fingerprint for data. It takes any input - such as a transaction or a block - and converts it into a unique string of letters and numbers.\u003C\u002Fp>\u003Cp>No matter how large or small the input is, the output (the hash) always has the same length. If even one tiny detail changes in the input, the resulting hash will be completely different. This makes hashes extremely useful for detecting tampering.\u003C\u002Fp>\u003Cp>In Bitcoin, hashes are used everywhere. They secure transactions, connect blocks together, and help miners validate new blocks. Because hashes cannot be reversed to reveal the original data, they also provide a layer of privacy.\u003C\u002Fp>\u003Cp>Think of a hash as a seal. Once the data is sealed, any attempt to modify it will break the seal, making the change obvious to the network.\u003C\u002Fp>","\u003Cp>Hashing works through a cryptographic algorithm, such as SHA-256 in Bitcoin.\u003C\u002Fp>\u003Cp>When data is passed through this algorithm, it produces a hash. This process is one-way, meaning you cannot reconstruct the original data from the hash.\u003C\u002Fp>\u003Cp>In mining, hashes play a central role. Miners repeatedly generate hashes while trying to find one that meets the network’s difficulty target. This involves:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>Changing a value called a nonce\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Recalculating the hash\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Comparing it to the required target\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>This process is repeated billions of times per second by ASIC hardware.\u003C\u002Fp>\u003Cp>Hashes are also used to link blocks together. Each block contains the hash of the previous block, forming a secure chain. If any block is altered, its hash changes, breaking the connection and alerting the network.\u003C\u002Fp>\u003Cp>Key properties of hashes:\u003C\u002Fp>\u003Cul>\u003Cli>\u003Cp>Deterministic (same input = same output)\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Irreversible\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Collision-resistant\u003C\u002Fp>\u003C\u002Fli>\u003Cli>\u003Cp>Sensitive to input changes\u003C\u002Fp>\u003C\u002Fli>\u003C\u002Ful>\u003Cp>\u003C\u002Fp>","\u003Cp>Imagine a mining operation using ASIC machines to mine Bitcoin.\u003C\u002Fp>\u003Cp>Each machine continuously generates hashes in an attempt to find one that satisfies the network’s difficulty requirement. For example, a valid hash might need to start with a certain number of zeros.\u003C\u002Fp>\u003Cp>A miner may generate trillions of hashes before finding a valid one. When a correct hash is found, the block is accepted by the network, and the miner receives the block reward.\u003C\u002Fp>\u003Cp>In a mining pool, all participants contribute their hashrate (hashing power). The more hashes a miner can generate per second, the higher their chances of earning a share of the reward.\u003C\u002Fp>","\u003Cp>Hashing speed directly impacts mining profitability, as faster hardware increases the likelihood of solving blocks.\u003C\u002Fp>",[],[],[],[18,21,24,27,30],{"answer":19,"question":20},"A hash function is a mathematical algorithm that converts input data into a fixed-length string. In Bitcoin, SHA-256 is used to generate hashes that secure transactions and blocks.","What is a hash function?",{"answer":22,"question":23},"No, hashes are designed to be one-way. It is computationally infeasible to reverse a hash and recover the original input data.","Can a hash be reversed?",{"answer":25,"question":26},"Hashes ensure data integrity and security. They make it easy to detect any changes in transactions or blocks, protecting the blockchain from tampering.","Why are hashes important in blockchain?",{"answer":28,"question":29},"Hashrate is the number of hashes a miner can generate per second. It measures computational power and directly affects mining performance and rewards.","What is hashrate?",{"answer":31,"question":32},"Yes, the ability to generate hashes quickly (high hashrate) increases the chances of solving blocks and earning rewards, making it a key factor in mining profitability.","Do hashes affect mining profitability?","Hash: Definition, How It Works in Mining, Examples","What is a hash in blockchain? Learn how hashing secures Bitcoin, how hashes are used in mining, what affects hashrate, and why hashes are critical for blockchain integrity.","published","2026-04-28T08:13:59.459Z","2026-04-28T08:13:58.501Z",{"items":39},[40,46,52,58,64],{"id":41,"slug":42,"term":43,"shortDefinition":44,"firstLetter":45},"ce33927e-0a72-4330-9722-bd17936a5b44","electricity-cost-per-kwh","Electricity Cost per kWh","Electricity cost per kWh refers to the price a miner pays for each kilowatt-hour (kWh) of electricity consumed by mining equipment. Since Bitcoin mining requires significant computational power, electricity costs are one of the largest ongoing expenses for miners. This cost is typically measured in dollars per kWh and varies depending on the location, electricity provider, and local rates.","E",{"id":47,"slug":48,"term":49,"shortDefinition":50,"firstLetter":51},"2a93ff5a-66a8-406b-b1ac-abd546ddbbf4","power-consumption","Power Consumption (Wattage)","Power consumption (wattage) refers to the amount of electrical energy that a Bitcoin miner uses to operate. It is measured in watts (W) and is a critical factor in determining the efficiency and profitability of mining hardware. The higher the power consumption, the more electricity a miner uses.\n","P",{"id":53,"slug":54,"term":55,"shortDefinition":56,"firstLetter":57},"3d8ac13a-ef6c-49fd-a4be-8390619a982c","block-propagation","Block Propagation","Block propagation is the process by which a newly mined block is shared across the Bitcoin network. Once a miner successfully mines a block, it is broadcast to the network so that all other nodes can verify and add it to their copies of the blockchain. ","B",{"id":59,"slug":60,"term":61,"shortDefinition":62,"firstLetter":63},"6cca5247-f8ca-4a24-9c5e-781698eb7aab","avalonminer","AvalonMiner","AvalonMiner is a series of ASIC (Application Specific Integrated Circuit) mining devices designed and manufactured by Canaan Creative. Learn more about AvalonMiners what was to built specifically for Bitcoin mining and are known for their energy efficiency, performance, and reliability. ","A",{"id":65,"slug":66,"term":67,"shortDefinition":68,"firstLetter":69},"0eee694f-8e80-48e7-b2ed-6ee5c106bd92","rejected-share","Rejected Share","A rejected share is a share that a miner submits that does not meet the pool’s criteria for a valid partial solution. Rejected shares are discarded and do not count towards the miner's total contribution, meaning the miner will not receive a reward for them. ","R"]