Mining – Bitcoin Wiki

Mining - Bitcoin Wiki



Mining is the process of adding transaction records to Bitcoin’s public ledger of past transactions (and a “mining equipment” is a colloquial metaphor for a single pc system that performs the necessary computations for “mining”. This ledger of past transactions is called the block chain spil it is a chain of blocks. The blockchain serves to confirm transactions to the surplus of the network spil having taken place. Bitcoin knots use the blockchain to distinguish legitimate Bitcoin transactions from attempts to re-spend coins that have already bot spent elsewhere.

Mining is intentionally designed to be resource-intensive and difficult so that the number of blocks found each day by miners remains sustained. Individual blocks voorwaarde contain a proof of work to be considered valid. This proof of work is verified by other Bitcoin knots each time they receive a block. Bitcoin uses the hashcash proof-of-work function.

The primary purpose of mining is to set the history of transactions ter a way that is computationally impractical to modify by any one entity. By downloading and verifying the blockchain, bitcoin knots are able to reach overeenstemming about the ordering of events ter bitcoin.

Mining is also the mechanism used to introduce Bitcoins into the system: Miners are paid any transaction fees spil well spil a “subsidy” of freshly created coins. This both serves the purpose of disseminating fresh coins te a decentralized manner spil well spil motivating people to provide security for the system.

Bitcoin mining is so called because it resembles the mining of other commodities: it requires exertion and it leisurely makes fresh units available to anybody who wishes to take part. An significant difference is that the supply does not depend on the amount of mining. Te general switching total miner hashpower does not switch how many bitcoins are created overheen the long term.


The Computationally-Difficult Problem

Mining a block is difficult because the SHA-256 hash of a block’s header voorwaarde be lower than or equal to the target ter order for the block to be accepted by the network. This problem can be simplified for explanation purposes: The hash of a block voorwaarde begin with a certain number of zeros. The probability of calculating a hash that starts with many zeros is very low, therefore many attempts vereiste be made. Ter order to generate a fresh hash each round, a nonce is incremented. See Proof of work for more information.

The Difficulty Metric

The difficulty is the measure of how difficult it is to find a fresh block compared to the easiest it can everzwijn be. The rate is recalculated every Two,016 blocks to a value such that the previous Two,016 blocks would have bot generated te exactly one fortnight (two weeks) had everyone bot mining at this difficulty. This is expected yield, on average, one block every ten minutes.

Spil more miners join, the rate of block creation increases. Spil the rate of block generation increases, the difficulty rises to compensate, which has a balancing of effect due to reducing the rate of block-creation. Any blocks released by malicious miners that do not meet the required difficulty target will simply be rejected by the other participants te the network.


When a block is discovered, the discoverer may award themselves a certain number of bitcoins, which is agreed-upon by everyone te the network. Presently this bounty is 12.Five bitcoins, this value will halve every 210,000 blocks. See Managed Currency Supply.

Additionally, the miner is awarded the fees paid by users sending transactions. The toverfee is an incentive for the miner to include the transaction te their block. Ter the future, spil the number of fresh bitcoins miners are permitted to create ter each block dwindles, the fees will make up a much more significant percentage of mining income.

The mining ecosystem


Users have used various types of hardware overheen time to mine blocks. Hardware specifications and spectacle statistics are detailed on the Mining Hardware Comparison pagina.

CPU Mining

Early Bitcoin client versions permitted users to use their CPUs to mine. The advent of GPU mining made CPU mining financially unwise spil the hashrate of the network grew to such a degree that the amount of bitcoins produced by CPU mining became lower than the cost of power to operate a CPU. The option wasgoed therefore eliminated from the core Bitcoin client’s user interface.

GPU Mining

GPU Mining is drastically swifter and more efficient than CPU mining. See the main article: Why a GPU mines swifter than a CPU. A multiplicity of popular mining equipments have bot documented.

FPGA Mining

FPGA mining is a very efficient and swift way to mine, comparable to GPU mining and drastically outperforming CPU mining. FPGAs typically consume very petite amounts of power with relatively high hash ratings, making them more viable and efficient than GPU mining. See Mining Hardware Comparison for FPGA hardware specifications and statistics.

ASIC Mining

An application-specific integrated circuit, or ASIC, is a microchip designed and manufactured for a very specific purpose. ASICs designed for Bitcoin mining were very first released ter 2013. For the amount of power they consume, they are vastly swifter than all previous technologies and already have made GPU mining financially.

Mining services (Cloud mining)

Mining contractors provide mining services with spectacle specified by contract, often referred to spil a “Mining Contract.” They may, for example, rent out a specific level of mining capacity for a set price at a specific duration.


Spil more and more miners competed for the limited supply of blocks, individuals found that they were working for months without finding a block and receiving any prize for their mining efforts. This made mining something of a gamble. To address the variance ter their income miners began organizing themselves into pools so that they could share prizes more evenly. See Pooled mining and Comparison of mining pools.


Bitcoin’s public ledger (the “block chain”) wasgoed commenced on January 3rd, 2009 at Legitimate:15 UTC presumably by Satoshi Nakamoto. The very first block is known spil the genesis block. The very first transaction recorded te the very first block wasgoed a single transaction paying the prize of 50 fresh bitcoins to its creator.

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