Skip to main content

What is Bitcoin Mining?

If you've ever wondered where Bitcoin comes from and how it goes into circulation, the answer is that it gets "mined" into existence. Bitcoin mining serves to both add transactions to the block chain and to release new Bitcoin. The mining process involves compiling recent transactions into blocks and trying to solve a computationally difficult puzzle. The first participant who solves the puzzle gets to place the next block on the block chain and claim the rewards. The rewards incentivize mining and include both the transaction fees (paid to the miner in the form of Bitcoin) as well as the newly released Bitcoin.

Security of the Bitcoin Network

Bitcoin mining is decentralized. Anyone with an internet connection and the proper hardware can participate. The security of the Bitcoin network depends on this decentralization since the Bitcoin network makes decisions based on consensus. If there is disagreement about whether a block should be included in the block chain, the decision is effectively made by a simple majority consensus, that is, if greater than half of the mining power agrees.
If an individual person or organization has control of greater than half of the Bitcoin network's mining power, then they have the power to corrupt the block chain. The concept of someone controlling more than half of the mining power and using it to corrupt the block chain is known as a "51% attack". How costly such an attack would be to carry out depends largely on how much mining power is involved in the Bitcoin network. Thus the security of the Bitcoin network depends in part on how much mining power is employed.
The amount of mining power that gets used in the network depends directly on the incentives miners have, that is, the block reward and transaction fees.

Block Reward

The amount of new bitcoin released with each mined block is called the block reward. The block reward is halved every 210,000 blocks, or roughly every four years. The block reward started at 50 bitcoin in 2009, and is now 25 bitcoin in 2014. This diminishing block reward will result in a total release of bitcoin that approaches 21 million. According to current Bitcoin protocol, 21 million is the cap and no more will be mined after that number has been attained.
As of today, block rewards provide the vast majority of the incentive for miners. At the time of writing, for the previous 24 hours, transaction fees represented 0.3% of mining revenue.

Transaction Fees

As the block reward diminishes over time, eventually approaching zero, the miners will be less incentivized to mine bitcoin for the block reward. This could be a major security problem for Bitcoin, unless the incentives provided by the block reward are replaced by transaction fees.
Transaction fees are some amount of Bitcoin that are included in a transaction as a reward for the miner who mines the block in which the transaction is included. Transaction fees are voluntary on the part of the person sending a transaction. Whether or not a transaction is included in a block by a miner is also voluntary. Thus, users sending transactions can use transaction fees to incentive miners to verify their transactions. The version of the Bitcoin client released by the core development team, which can be used to send transactions, has fee minimum rules by default.

Mining Difficulty

How hard is it to mine Bitcoins? Well, that depends on how much effort is being put into mining across the network. Following the protocol laid out in the software, the Bitcoin network automatically adjusts the difficulty of the mining every 2016 blocks, or roughly every two weeks. It adjusts itself with the aim of keeping the rate of block discovery constant. Thus if more computational power is employed in mining, then the difficulty will adjust upwards to make mining harder. And if computational power is taken off of the network, the opposite happens. The difficulty adjusts downward to make mining easier.
The higher the difficulty level, the less profitable mining is for miners. Thus, the more people mining, the less profitable mining is for each participant. The total payout depends on the price of Bitcoin, the block reward, and the size of the transaction fees, but the more people mining, the smaller the slice of that pie each person gets.

Mining Hardware

Anyone with access to the internet and suitable hardware can participate in mining. In the earliest days of Bitcoin, mining was done with CPUs from normal desktop computers. Graphics cards, or graphics processing units (GPUs), are more effective at mining than CPUs and as Bitcoin gained popularity, GPUs became dominant. Eventually, hardware known as an ASIC (which stands for Application-Specific Integrated Circuit) was designed specifically for mining Bitcoin. The first ones were released in 2013 and have been improved upon since, with more efficient designs coming to market. Today, mining is so competitive, it can only be done profitably with the latest ASICs. When using CPUs, GPUs, or even the older ASICs, the cost of energy consumption is greater than the revenue generated.
As ASICs are advanced and more participants enter the mining space, the difficulty has shot up exponentially. A lot of this activity has been incentivized by the large price increase Bitcoin experienced in 2013 and speculation that the price may rise further. There is also political power within the Bitcoin ecosystem that comes with controlling mining power, since that mining power essentially gives you a vote in whether to accept changes to the protocol.
There are many companies which make mining hardware. Some of the more prominent ones are BitfuryHashFastKnCMiner and Butterfly Labs. Companies such as MegaBigPowerCloudHashing, and CEX.io also allow customers to lease hosted mining hardware.
Mining Pools
Mining rewards are paid to the miner who discovers a solution to the puzzle first, and the probability that a participant will be the one to discover the solution is equal to the portion of the total mining power on the network. Participants with a small percentage of the mining power stand a very small chance of discovering the next block on their own. For instance, a mining card that one could purchase for a couple thousand dollars would represent less than 0.001% of the network's mining power. With such a small chance at finding the next block, it could be a long time before that miner finds a block, and the difficulty going up makes things even worse. The miner may never recoup their investment. The answer to this problem is mining pools. Mining pools are operated by third parties and coordinate groups of miners. By working together in a pool and sharing the payouts amongst participants, miners can get a steady flow of bitcoin starting the day they activate their miner. Statistics on some of the mining pools can be seen on Blockchain.info.
Electricity Costs
The main operational costs for miners are the hardware and the electricity cost, both for running the miners but also for providing adequate cooling and ventilation. Some major mining operations have been purposely located near cheap electricity. The largest mining operation in North America, run by MegaBigPower, is located on by the Columbia River in Washington State, where hydroelectric power is plentiful and electricity prices are the lowest in the nation. And CloudHashing runs a large mining operation in Iceland, where electricity generated from hydroelectric and geothermal power sources is also renewable and cheap, and where the cold northern climate helps provide cooling.
Regulation
Earlier this year, the IRS issued tax guidance regarding Bitcoin and said that income from mining could constitute self-employment income and be subjected to tax. FinCEN, the Financial Crimes Enforcement Network, is a bureau of the U.S. Treasury that collects and analyzes data on financial transactions with the aim of fighting financial crimes, especially money laundering and terrorist financing. FinCEN has issued guidance saying that bitcoin miners are not considered Money Transmitters under the Bank Secrecy Act and recently clarified that providers of cloud mining services are also not considered Money Transmitters.

The Bottom Line
Bitcoin mining is the means by which new Bitcoin is brought into circulation, the total of which is to be capped at 21 million BTC. Miners are in an arms race to deploy the latest bitcoin mining chips and often choose to locate near cheap electricity. As more computing power is used in mining, the difficulty of the puzzles increases, keeping profitability in check.

Link:
http://www.investopedia.com/articles/investing/043014/what-bitcoin-mining.asp

Comments

Popular posts from this blog

How Blockchain Could Help Tech Giant Cisco Reboot

Cisco is changing. The technology firm best known as the supplier of enterprise computer hardware has seen a slow, steady decline in revenue from some of its core products. As a result of an increasing number technological services being virtualized, and the storage of information moving to the cloud, the $158bn firm has been  restructuring  and exploring new ways to capitalize on connected devices. But amidst this change in identity, it's in identity itself where some of the California-based company's most interesting new experiments are taking place. With a series of early stage blockchain  projects , Cisco is now pushing even deeper into what could end up being much more than a way for employees to prove who they are across subsidiaries. In conversation with CoinDesk, Robert Greenfield IV, Cisco software engineer and executive team lead of the firm's Connected Black Professionals resource group, explained how several blockchain projects have evolv...

Bitcoin in Africa: Insights from the Continent’s Biggest Bitcoin Exchange

Isn’t it absurd that nearly 326 million people representing 80% of the adult population in Africa do not have access to bank accounts? This wretched situation denies countless of people financial freedom in the so-called dark continent. Bureaucratic tenors and economic exclusion inter alia have paved the way for the current phenomenon. Last year a study of 10 African nations with unusual inflationary ratio had South Sudan registering an unimaginable inflation rate of 295 percent. Egypt had the slightest with 12.30 percent. African governments continue to plunder the riches of the African people through Inflation. This makes it considerably insurmountable for individuals to conserve their resources. Moreover, public sector borrowing has crowded out the efficient private sector that can put credit to good use. The IMF estimates that averagely credit to the private sector is estimated at 30 percent of GDP in Sub-Sahara Africa. CCN spoke to Werner van Rooyen, Head of Business Develo...

WANT TO BUY BITCOIN IN SOUTH AFRICA , KENYA, UGANDA, NIGERIA, GHANA OR OTHER COUNTRIES IN AFRICA? SIMPLE.

With the growing awareness around Africa of bitcoin as a crypto-currency, a means of remittance and a creator of  wealth, more and more people in more and more countries are looking to buy it, and asking how and where they can buy it. Purchasing bitcoin is simple. Simply go online and do a search for “Buying and selling bitcoin in South Africa ““Buying and selling bitcoin in Kenya “Buying and selling bitcoin in Uganda ““Buying and selling bitcoin in Nigeria “ or  “Buying and selling bitcoin in Ghana“ – you get the idea.   To help you though:   In South Africa, three of the most common (and trusted) platforms are: www.localbitcoins.com www.luno.com www.bitx.co In Kenya, the most common (and trusted) platforms) are: www.localbitcoins.com www.bitpesa.co whilst other platforms include: www.altcoins.io www.99bitcoins.com In Uganda, the most common (and trusted) platforms) are: www.localbitcoins.com www.bitpesa.co whilst other platforms incl...