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  Bitcoin is a form of digital currency, created and held electronically. No one controls it. Bitcoins aren’t printed, like dollars or euros – they’re produced by people, and increasingly businesses, running computers all around the world, using software that solves mathematical problems Bitcoin is a digital asset12 and a payment system invented by Satoshi Nakamoto, who published the invention in 200813 and released it as open-source software in 2009.14 The system is peer-to-peer and transactions take place between users directly, without an intermediary.15:4 These transactions are verified by network nodes and recorded in a public distributed ledger called the block chain,16 which uses bitcoin as its unit of account. Since the system works without a central repository or single administrator, the U.S. Treasury categorizes bitcoin as a decentralized virtual money.1 Bitcoin is often called the first cryptocurrency,171819 although prior systems existednote 5 and it is more correctly described as the first decentralized digital currency.1522 Bitcoin is the largest of its kind in terms of total market value.23 Bitcoins are created as a reward for payment processing work in which users offer their computing power to verify and record payments into a public ledger. This activity is called mining and miners are rewarded with transaction fees and newly created bitcoins.15 Besides being obtained by mining, bitcoins can be exchanged for other currencies,24 products, and services.25 When sending bitcoins, users can pay an optional transaction fee to the miners.26 In February 2015, the number of client accepting it for products and services passed 100,000.27 Instead of 2–3% typically imposed by credit card processors, people accepting bitcoins often pay fees in the range from 0% to less than 2%.28 Despite the fourfold increase in the number of boss accepting it in 2014, the cryptocurrency did not have much momentum in retail transactions.29 The European Banking Authority30 and other sources15:11 have warned that bitcoin users are not protected by refund rights or chargebacks. The use of bitcoin by criminals has attracted the attention of financial regulators,31 legislative bodies,32 law enforcement,33 and media.34 Criminal activities are primarily centered around darknet markets and theft, though officials in countries such as the United States also recognize that bitcoin can provide legitimate financial services to merchants that buy btc kirkuk, Iraq
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