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  What are bitcoins?

Bitcoin is the world's first decentralized digital monetary system, bitcoin is called cryptocurrency, where the creation and transfer of bitcoins is based on an open-source cryptographic protocol that is independent of any central authority.
Bitcoins can be transferred through a computer or smartphone without an intermediate financial institution.

The concept was introduced in a 2008 paper by a pseudonymous developer known only as 'Satoshi Nakamoto', who called it a peer-to-peer, electronic cash system.
  The processing of Bitcoin transactions is secured by servers called bitcoin miners.
These servers communicate over an internet-based network and confirm transactions by adding them to a ledger which is updated and archived periodically using peer-to-peer filesharing technology.
In addition to archiving transactions, each new ledger update creates some newly minted bitcoins.

The number of new bitcoins created in each update is halved every 4 years until the year 2140 when this number will round down to zero. At that time no more bitcoins will be added into circulation and the total number of bitcoins will have reached a maximum of 21 million bitcoins.

To accommodate this limit, each bitcoin is subdivided down to eight decimal places; forming 100 million smaller units called satoshis.
In August 2013 Germany's Finance Ministry subsumed Bitcoins under the term 'unit of account' a financial instrument, though not as e-money or a functional currency.

Although bitcoin is promoted as a digital currency, many commentators have criticized bitcoin's volatile exchange rate, relatively inflexible supply, high risk of loss, and minimal use in trade.
  A user can have one or more bitcoin addresses from which bitcoins are sent or received using either a website or downloaded software often called a 'wallet' like a digital wallet. Users can obtain new bitcoin addresses as needed.

Many bitcoin services provide addresses tied to a user's individual account to hold funds on the user's behalf.

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