Top 5 bitcoin mining companies

Top 5 bitcoin mining companies Die Erkenntnis, dass der Handel mit A pie chart showing the hashrate distribution between the major bitcoin mining pools - Blockchain. The graph below shows the market share of the most popular bitcoin mining pools. It should TOP : 11.1% SlushPool : 8.9% Unknown : 6.6% F2Pool : 4.9% BitClub Network : 2.9% BTCC Pool : 2.4% : 1.7% BW.Dec 18, 2017 On Oct. 12, the company introduced its Wanke coin mining cryptocurrency project, which is similar to that of bitcoin. While the company generated $681,105 in net profit through the first nine months of the year, the volume activity on the virtual currencies it has brought to market is minimal at best. What's  , is it a scam or paying? The following review will serve as a reference to help you make a decision whether to invest or not. Fflakmi. Ccg Mining Review – Mine different cryptocurrencies at your own scale. Potential long-term opportunity · Review · Latest Review · TOP Reviews · Trusted  how data mining works in healthcareBitcoin is the currency of the future & Genesis Mining is the largest cloud mining company on the market. Mine bitcoin through the cloud, get started today!Mar 14, 2017 5. HashPoke. A lot of bitcoin users were quite surprised to find out a bitcoin cloud mining company registered in Belgium was trying to make a name for itself. Considering Belgium is one of the most expensive countries in Europe for electricity, such claims were ludicrous at best. Despite launching in August 

10 Best and Biggest Bitcoin Mining Pools Comparison 2017 — Steemit

Until now, the most important manifestation of blockchain technologies has been Bitcoin. However, anything that requires trust or proof is a good candidate for the blockchain, as bitcoin miners will naively validate and confirm those transactions too – because those miners are always trying to solve the next block and earn  how to get bitcoins same day Jan 8, 2018 The company's mission is to accelerate the development of the global financial system, and it accomplishes this mission by building and supporting bitcoin and blockchain companies. The firm has invested in more than 75 bitcoin-related companies and is the world's leading firm for investing in Dec 23, 2017 Gone are the days when you could mine Bitcoin with a normal GPU rig. Currently, you need extremely powerful ASIC miners to mine Bitcoin. There are a few ASIC miner companies like BitMain, Avalon etc that I trust. Personally, I like BitMain's AntMiners as they have the lowest payback period than the rest. cloud mining btc Jun 13, 2017 Now that you have your Bitcoin mining hardware, your next step is to join the best Bitcoin mining pool. Mining pools are groups of cooperating As Bitcoin mining is somewhat centralized, 10–15 mining companies have claimed the vast majority of network hash power. With many of these companies in the 

Nov 1, 2017 5. BTCC. BTCC is a pool and also China's third largest Bitcoin exchange. Its mining pool currently mines about 7% of all blocks. As Bitcoin mining is somewhat centralized, 10-15 mining companies have claimed the vast majority of network hash power. With many of these companies in the same country,  become a bitcoin miner quests Aug 27, 2016 Unless you've been living under a rock for the past 5 years, you've likely at least heard the word “Bitcoin” before. Companies are investing millions of dollars to build out these ultra-secure facilities in countries like Iceland who is known for their discounted electricity rates, one of the largest expenses when Last but not least, the best advice anyone can give you when looking for Bitcoin cloud mining companies is doing your own research. Type in the company name in Google, and see if any reviews Affiliate Program : 1.5%​ - %0.7 + 5 ghs bonus for each referral. Accept: Perfect money, Payeer, Bitcoin, Litecoin and Dogeco  mining hardware comparison amd Jan 8, 2017 So far so good. 6. BIT-X. About BIT-X, Top 5 bitcoin mining company. BIT-X made an official announcement of their diverse exchange platform, including the ability to mine and trade GHS, in November 2014. Their initial launch was greeted with some skepticism amongst Bitcointalk members, as they Jan 4, 2018 3. However, Caixin's report, which did not identify its sources, indicates that top regulators in China are planning to withdraw preferential benefits such as tax deductions and cheap electricity supplies available to bitcoin mining companies. This means the government's current stance on bitcoin mining is to 

Bitcoin mining companies face shutdown in southwest China

I'm newbie here,Are there any legit bitcoin mining company or basically most of them are just scam. Base on my analysis and experience most of the mining site are good at first but in the long run they will run and take all the investment by many users that is why if you will enter in the mining site and want to  Or just mine with your computer and join a pool with one of the other profitable coins found here: -- bitcoin mining is a losing battle for the soloist. I have written a post about four good cloud mining sites called How to Safely Profit from Ethereum and Bitcoin Cloud Mining. Feel free  litecoin mining distroThe Securities and Exchange Commission today charged two Bitcoin mining companies and their founder with conducting a Ponzi scheme that used the lure of quick to content. 10-09-2017. These are the Top 5 companies leading the bitcoin mining Industry. Here is a list of the biggest names accepting bitcoins Become the best Bitcoin miner and learn how to mine Bitcoins with the best Bitcoin mining hardware, software, pools and cloud mining. 700 digital Gold in them bits: Inside the world*s most mysterious Bitcoin mining company .. The best 5 bitcoin mining equipment of today | best asic miner | bitcoin mining hardware. Dec 19, 2017 Bitcoin miners can switch mining pools easily by routing their hash power to a different pool, top 5 bitcoin mining companies farms the market share of pools is constantly changing. To make the list of top 10 miners, we looked at blocks found over the past 6 months using data from BlockTrail. The size of 

Top 5 bitcoin mining companies

Is a cloud mining subscription worth it? - Bitcoin Stack Exchange

Top 5 bitcoin mining companies If you wish to rent a Bitcoin Mining rig and mine for 5 months, you sign a 'contract' for 5 months where you don't have to pay for the cost of the entire mining As good as it sounds, cloud mining is often a double edged sword. It is best to look up for reviews of a particular mining company before going for their services.Sep 16, 2017 Cloud mining pool companies provide mining services through the cloud where, instead of buying and setting up your own expensive miners at home, you access the company's miners online via cloud using only a computer at your home. This way, you not only avoid buying expensive hardware and  myCoinCloudt: 3 TH/s from 3 months $72 or ETH, ZEC, BCC, ETC, XMR mining: Click Here! Click Here! 3 Months Contract. 15. BtcSweet - Bitcoin Cloud Mining. BtcSweet: 1.12 TH/s $200 + FREE 5 GH/s SignUp Bonus: Click Here! 16. EasyMiners - Bitcoin Cloud Mining. EasyMiners: 4.73 TH/s 0.4 BTC: Click Here! bitcoin mining for charityBest bitcoin cloud mining company, best cryptocurrency mining contract, best bitcoin contracts, companies like genesis mining, similiar to hashflare.Dec 18, 2017 Exchanges, chip makers and blockchain companies are safer investments, says Nigam Arora. The chart shows how The Arora Report took profits at the top on bitcoin euphoria. For example, there were rumors that changes to mining algorithms would make existing bitcoin-mining computers obsolete. crypto mining taxesNov 3, 2017 This is my favorite cloud mining company in China. A world's TOP Bitcoin, Litecoin and Dashcoin mining pool who provides professional & stable mining services with very low fees. User friendly interface with high security, stability and transparency. The CEO of ViaBTC is a former developer at Tencent 

Bitcoin, Bitcoin Mining, Bitcoin Cloud Mining. Bitcoin Cloud Mining – CryptoMiningFarm. CryptoMiningFarm – Bitcoin Cloud Mining. The Top 10 Best Bitcoin Cloud Mining Deals available Online: 1. 5. eobot: 1 TH/s 4.0 $1830 + Daily Faucet, win FREE BTC, ETH & more: Click Here! 6. MyCoinCloud: 3 TH/s from 3 months  - Unlimited Free Bitcoins to Everyone! Aug 31, 2017 Hi. Anyone uses cloud mining services ? Yeah I know. The money-eaters and possibly a scam. But personally this is what I had started with all that Bitcoin thing in february 2017 before I have changed the strategy to jus…Dec 29, 2017 As Bitcoin mining becomes more challenging, it's also becoming more centralized around a few larger companies that have sufficient capital, the latest equipment and access to reliable energy sources. An estimated 70 percent of hash power produced on the network today is produced by Bitmain for their 

Top 5 bitcoin mining companies

Aug 8, 2017 There are several risks you must be aware of before you invest in bitcoin cloud mining: Mining Competition, Ponzi Schemes, Bad business, Bitcoin The good cloud mining companies will still be there and offer contracts tomorrow as well. Miner Gate · MinerGate review, 9.0, Paying, August 5, 2017. Dec 20, 2017 Listed below is a consolidated list of Top Ethereum mining companies It gradually joined the bitcoin trading community and has evolved into one of the most consistent and renowned Ethereum mining company. The company This is a China-based company and mines about 5% of the blocks available. j make bitcoins bitcoin miner win82 days ago For the purposes of introducing some of the prevailing concepts behind the growing population of cryptocurrencies, we'll take a closer look at the technologies behind Litecoin and Ethereum, how they compare to bitcoin and what they each bring to the table for prospective investors, miners and traders. The Mar 30, 2016 Pay Per Last N Shares (PPLNS) approach adds an element of 'luck', which fluctuates between 5-30% on top of the payout you would have received had you Cloud mining is a relatively new concept and miners have far more choices in 2016 than ever before from among various cloud mining companies.

offers cryptocurrency cloud mining services on modern, high-efficiency equipment. Dec 21, 2017USI Tech is one of the top cryptocurrency mining companies worldwide. Know for it's bitcoin mining bitcoins time Today's modern and best bitcoin mining hardware. Application-specific integrated circuit (ASIC) miners have taken over completely. These ASIC machines mine at unprecedented speeds while consuming much less power than FPGA or GPU mining rigs. Several reputable companies have established themselves with  Nov 7, 2017 At Bitcoin Cloud Mining you can find a detailed list and reviews of as many cloud mining providers as we can find. GENESIS MINING INTRODUCTION GENESIS MINING is the world's leading and most transparent hosted hashpower provider for Bitcoin and . TOP 10 CLOUD MINING COMPANIES.HashRev claims to be the best and fastest Bitcoin cloud mining company. Find out how HashRev's mining system works today in our review. What Is HashRev? HashRev is a cloud-based mining software that lets you earn bitcoins without any special hardware or software. The company claims to be the first to introduce this 

If you you had a machine that could literally print money (like a bitcoin ASIC miner) wouldn't you just use it yourself to [–]Bitcoiniswin 17 points18 points19 points 5 months ago (4 children) .. In my honest opinion this is the best cloud mining company out there and i sincerely advise people to jump in. However, by some reason, the 721 manages to output some nice hashrate and one year later it is still considered a solid miner. Canaan interactive is a China-based company that is focused strictly on manufacturing Bitcoin ASICs. The Avalon 721 is based on 16nm chips, which  mining bitcoin adalah youtube Jan 5, 2018 With its price dropping, sky-high transaction fees, growing traction among competitors, and regulatory agencies taking action in several countries, Bitcoin is starved for good news. Today marked another blow against dominant cryptocurrency: China is working to rid itself of bitcoin mining companies. Learn which Bitcoin mining pools are best for making money for Bitcoin miners. A "share" is awarded to members of the Bitcoin mining pool who present a valid proof of work that their Bitcoin miner solved. Bitcoin mining in Slush Pool: Slush Pool is run by Satoshi Labs, a Bitcoin company based in the Czech Republic.1 day ago A man who spent more than £3000 on a bitcoin-mining product listed on Amazon instead received a DVD copy of children's film The Boss Baby. Ichim Bogdan “At Amazon, we are committed to providing our customers with the best possible shopping experience,” a spokesperson for the company said.

Genesis Mining is great for cloud miners who want to mine without having to go through the stress of choosing a bitcoin mining pool, hardware, software or setting up a .. BE AN EARLY BIRD!!! or user can fid top 10 bitcoin mining farm, top 5 bitcoin mining farm, top 5 bitcoin mining company, top 10 bitcoin mining company,  Aug 1, 2017 5 min read. Bitcoin mining is a process that both adds transactions to the cryptocurrency blockchain ledger but also unlocks new Bitcoins into the system. Further to this, in each country, the top handful of mining companies have harnessed a large amount of network hash power in their mining efforts  bitcoin mining farm profit Dec 20, 2017 While the vast majority of investors are buying Bitcoin via exchanges, it's still possible to get the cryptocurrency for dramatically less than the current exchange rate. Bitcoin mining isn't glamorous, but for the people willing to put in the work (dedicating a computer's power to run a transaction validating  Sep 2, 2017 The race is on. But arguably more important cmpany the miners minimg individuals and organisations who form the core backbone of bitcoin, ensuring the digital currency's integrity. Bitcoin runs on a blockchain, a decentralised and public ledger of every transaction made on the network. By offering Micro- Mining is Bitcoin cloud mining platform Start bitcoin mining free earn profit daily without hardware.

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Top 5 bitcoin mining companies

Nov 20, 2017 Today, however, a more specialized chipset known as ASIC handles most bitcoin mining. Nonetheless, NVIDIA's graphic cards remain a staple for mining a number of burgeoning cryptocurrencies. But herein lies the dilemma for NVIDIA's shareholders: The company doesn't break out what percentage of its 

Robert Levine, “Data Mining the Digital Gold Rush: Four Companies That Get It,” Billboard 127(10) (2015): 14–15. 17. Zoe Keating,” Forbes, June 5, 2015; -and-the-arts-and-interview-with-artist-and-composer-Zoe-keating/, accessed August 14, 2015. 25. Ibid. 26.Aug 20, 2017 He had already designed custom chips for the company he co-founded, Bitmain, that had made it into the world's leading bitcoin miner, allowing it. Zhan, the Sophon chip designer and the technical brains behind Bitmain, was running a startup called DivaIP in 2010 that made a set-top box that allowed a  genesis mining google auth code invalid This is a list of Wikipedia articles on for-profit companies with notable commercial activities related to bitcoins and Cryptocurrency. Common services are wallet providers, bitcoin exchanges, payment service providers and venture capital. Other services include mining pools, cloud mining, peer-to-peer lending,  cloud mining provider. They are the largest Bitcoin cloud mining provider and furthermore are now offering Ethereum/X11 mining contracts as well. Eobot easiest, cheapest, and best cloud mining solution. Start with as little as That happened right after signing of the agreement with BitFury Company. [Read More] Visit 

China's Crackdown on Crypto-Mining Threatens Bitcoin's Future

Top 5 bitcoin mining companies

mining companies london Sep 28, 2017 We trawl the web and if we have any doubts about the Company offering the Bitcoin cloud mining contract it does not appear on our list. They show a Bitcoin address that they make payouts from that is verifiable. One day the address stops paying. 5. They use promotion over substance with, for example,  bitcoin-qt earn Bitcoin Mining pools, TOP 10 BITCOIN MINING POOLS FOR 2018 , Bitcoin Pool, BitMinter, Discus Fish, BWPool, Kano CK Pool, AntPool. bitcoin mining free, bitcoin Discus Fish is a China-based mining pool that mines about five percent (5%) of Bitcoins in the Bitcoin network. This is unarguably a gold mining company.

Aug 8, 2017 In an extensive conversation with Moneycontrol, Marco Streng, CEO of Genesis Mining, the largest cloud mining company in the world, sheds light upon the Currently, we have a highly motivated team spread across 5 continents, comprised of mathematicians, investment bankers, engineers, security  bitcoin cloud mining login Jul 12, 2016 However, for you to invest in this area it requires dependence on Bitcoin cloud mining companies but very few are actually legit. Here is how It is true that the bitcoin cloud miner market sector has very sharp thin profits and as a result it gets harder for companies to pay 5% let alone 10% referrals. As such  cryptocurrency mining guide Nov 20, 2017 Top 5 bitcoin mining companies that mine News Business Jun 15, Users need use.

The Cloud Mining Directory writes detailed, unbiased reviews for all major cloud mining companies. If you plan to mine Bitcoin in the cloud, make an informed decision based on our reviews. mining hardware websites cryptocurrency mining comparison 10 hours ago In mid-October, the company announced an update on its cryptocurrency operations, highlighting that its bitcoin mining operations are projected to generate over $2 million in monthly revenue. On December 5, MGT Capital provided an update on its cryptocurrency operations, stating it had executed a 

HashFlare - Cloud Mining

[33] “Top 100 Blockchain Organisations: From CoinDeskto BitPay,These Arethe Most InfluentialOrganisationsin theDistributed Ledger Space”. Richtopia. [41] “These are the 5 Hottest Companies in Fintech”. Retrieved Ripple is the third-largest cryptocurrency by market capitalization,[10][11] after bitcoin and Ethereum. mining ventilation services Dec 9, 2017 Best 4 cloud mining companies in the world 1-Best Bitcoin Cloud Mining with Free 50 GHS Hashpower - Paying Since 2014 What is CryptominingFarm is a bitcoin mining company and investment opportunity that wants Last edited by best4545 on Wed Jan 10, 2018 3:47 pm, edited 5 times in total.Dec 15, 2016 In March, the Genesis team adjusted their strategy by launching Logos Fund, an investment fund catering to top-tier venture capitalists. To date, the fund has raised a reported $100 million in assets. Now, Genesis Mining is respected as one of the few companies within the Bitcoin industry that has created a  bitcoin mining pool south africa Jan 6, 2017 We write about best Bitcoin mining company and is best Bitcoin Mining Company, we were in market since 2011, we are best Bitcoin Mining, Bitcoin Mining farm, Bitcoin Mining Company, cloud bitcoin mining contract, Criptocurrency mining. 1. Genesis Mining. About Genesis Mining, Bitcoin 

May 23, 2016 Here is a list of the top bitcoin cloud mining companies. Earn bitcoins everyday from cloud mining. cloud mining btc gratis Sep 24, 2017 How To Invest in the Coming Bitcoin Boom Lithium Mining Companies The Lithium revolution has begun. There has never been a better time to invest in Lithium Mining Companies than now. We have compiled a list of the top Lithium Mining Companies for you and have also provided some more detailed Oct 4, 2017 In front of me are nine warehouses with bright blue roofs, each emblazoned with the logo for Bitmain, a Chinese firm headquartered in Beijing that is arguably the most important company in the Bitcoin industry. Bitmain sells Bitcoin mining rigs—the specialized computers that keep the cryptocurrency  b bitcoin mining blocks Dec 7, 2017 Bitcoin Stocks to Buy: Bitcoin Investment Trust (GBTC). Stocks to Buy: Bitcoin Investment Trust (GBTC). Source: Shutterstock. Barry Silbert has been behind many cryptocurrency trends over the last few years. He was previously best known for Second Market — a way to trade stock in private companies,  Dec 10, 2015 Leading bitcoin mining companies F2Pool, BTCC, and Slush's Pool are confident of a positive business environment with the price appreciation.

Jun 1, 2017 Bitcoin mining companies have been shut down or relocated in Mabian Yi Autonomous County, home to a prosperous mining industry in southwest China's Sichuan province, and the reason for the phenomenon is unclear. The shutdown is made more puzzling by the fact that the value of Bitcoins has  4 btc minerals The pricing range of cloud mining is very wide. The cheapest bitcoin cloud mining contract on the market costs 0.99 USD per GH/s at OxBTC. The average price of the contracts are around 5-15 USD per GH/s. Some provider offers better unit prices if more hashing power is purchased, others just price bigger contracts just Jan 25, 2017 The Bitcoin miners are the key to Bitcoin security and miners are responsible for the creation of new bitcoins. Here is the list of Top 10 Bitcoin miners. #5 BW Pool. BW mining company was established in 2014 and is another Chinese mining based company. It currently mines around 8% of all blocks. mining litecoin 2018 Genesis is the only genuine CLOUD mining company with a good reputation. However, your definition and my definition of CLOUD MINING may be two very different things. CLOUD MINING * You own your own equipment, then connect it to a Genesis, who then Top 6 Best Cloud Mining Platforms for Bitcoin | 2017 Ranking | Most Popular Bitcoin Cloud Mining Companies Making use of digital currency and allowing consumers to rent the technology necessary to uncover it, the best bitcoin cloud mining platforms are making bitcoins more accessible to the general population.

Mining for bitcoin is getting much costlier, and will only get more expensive as time goes on. Genesis Mining is one of a handful of cloud companies trying to make the process easier for people. Sameepa Shetty | @sameepa. Published 5:18 PM ET Fri, 15 Dec 2017 Updated 8:06 PM ET Fri, 15 Dec 2017  F2Pool has mined about 5-6% of all blocks over the past six months. ViaBTC ViaBTC is a somewhat new mining pool that has been around for about one year. It's targeted towards Chinese miners. BW Pool BW, established in 2014, is another mining company based in China. It currently mines about 5% of all blocks. Bitclub  v best bitcoin mining pools Nov 21, 2017 2- CCG Mining Best Bitcoin Cloud Mining companies. 3- Genesis Mining 100% recommended for bitcoin and ethereum Cloud mining. 4- CryptoMiningFarm 50GHS free for bitcoin cloud mining. 5- Nx-Mining 1 TH/s 0.0407 BTC + FREE 50 GH/s SignUp. Read related post: Best Cloud Mining 2018 Nov 4, 2017 Bitcoin mining could either be done solo i.e. an individual doing alone or in group i.e. joining pools. However, on a ranking of 1-20, some companies have proven to be the largest miners from data recovered between August 5 – August 12 from bitcoin network analysis company blocktrail. Unknown entity-  bitcoin mining minimum hardware BITCOIN MINING SERVICES – CLOUD MINING. Some Reasons to Consider Genesis Mining Are;. · Genesis mining has proven to be one of the transparent and trustworthy mining company. · It has repeat customers; these are customers who trust the company and always come back to use its service. · It has a good 

Top 5 bitcoin mining companies

Most miners only realize they might not get a return on their investment when it is too late, because in the beginning, the first 6 months or so, the profits look good. After the 6 month window, the declines in profit are far more noticeable. Most computer hardware has a lifespan of around 3 to 5 years, and bitcoin miners are 

F2Pool has mined about 5-6% of all blocks over the past six months. ViaBTC ViaBTC is a somewhat new mining pool that has been around for about one year. It's targeted towards Chinese miners. BW Pool BW, established in 2014, is another mining company based in China. It currently mines about 5% of all blocks. Bitclub  tegra 3 bitcoin mining Dec 20, 2017 Listed below is a consolidated list of Top Ethereum mining companies It gradually joined the bitcoin trading community and has evolved into one of the most consistent and renowned Ethereum mining company. The company This is a China-based company and mines about 5% of the blocks available. altcoin mining tools

Become the best Bitcoin miner and learn how to mine Bitcoins with the best Bitcoin mining hardware, software, pools and cloud mining. 700 digital Gold in them bits: Inside the world*s most mysterious Bitcoin mining company .. The best 5 bitcoin mining equipment of today | best asic miner | bitcoin mining hardware. Or just mine with your computer and join a pool with one of the other profitable coins found here: -- bitcoin mining is a losing battle for the soloist. I have written a post about four good cloud mining sites called How to Safely Profit from Ethereum and Bitcoin Cloud Mining. Feel free  hashflare hardware Robert Levine, “Data Mining the Digital Gold Rush: Four Companies That Get It,” Billboard 127(10) (2015): 14–15. 17. Zoe Keating,” Forbes, June 5, 2015; -and-the-arts-and-interview-with-artist-and-composer-Zoe-keating/, accessed August 14, 2015. 25. Ibid. 26. litecoin mining windows 7 myCoinCloudt: 3 TH/s from 3 months $72 or ETH, ZEC, BCC, ETC, XMR mining: Click Here! Click Here! 3 Months Contract. 15. BtcSweet - Bitcoin Cloud Mining. BtcSweet: 1.12 TH/s $200 + FREE 5 GH/s SignUp Bonus: Click Here! 16. EasyMiners - Bitcoin Cloud Mining. EasyMiners: 4.73 TH/s 0.4 BTC: Click Here!

Nov 20, 2017 Today, however, a more specialized chipset known as ASIC handles most bitcoin mining. Nonetheless, NVIDIA's graphic cards remain a staple for mining a number of burgeoning cryptocurrencies. But herein lies the dilemma for NVIDIA's shareholders: The company doesn't break out what percentage of its  Dec 15, 2016 In March, the Genesis team adjusted their strategy by launching Logos Fund, an investment fund catering to top-tier venture capitalists. To date, the fund has raised a reported $100 million in assets. Now, Genesis Mining is respected as one of the few companies within the Bitcoin industry that has created a Top 6 Best Cloud Mining Platforms for Bitcoin | 2017 Ranking | Most Popular Bitcoin Cloud Mining Companies Making use of digital currency and allowing consumers to rent the technology necessary to uncover it, the best bitcoin cloud mining platforms are making bitcoins more accessible to the general population. bitcoin mining at workplace bitcoin mining wikipedia year Most miners only realize they might not get a return on their investment when it is too late, because in the beginning, the first 6 months or so, the profits look good. After the 6 month window, the declines in profit are far more noticeable. Most computer hardware has a lifespan of around 3 to 5 years, and bitcoin miners are 

Top 5 bitcoin mining companies