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DEFINITION of 'Dogecoin' Dogecoin is a peer-to-peer open source cryptocurrency and falls under the category of altcoins. Launched in December 2013 with a Shibu Inus (Japanese dog) as its logo, Dogecoin looked casual in its approach but is gaining wide acceptance for online transactions.A cryptocurrency (or crypto currency ) is a controversial  digital asset designed to work as a medium of exchange that uses
strong cryptography to secure financial transactions, control the creation of additional units, and verify the transfer of assets.  Cryptocurrency is a kind of digital currency ,
virtual currency or alternative currency . Cryptocurrencies use decentralized control as opposed to centralized electronic money and central banking systems.  The decentralized control of each cryptocurrency works through distributed ledger technology, typically a blockchain , that serves as a public financial transaction database. 
Bitcoin , first released as open-source software in 2009, is generally considered the first
decentralized cryptocurrency.  Since then, over 4,000 altcoin ( alternative coin ) variants of bitcoin have been created. 
According to Jan Lansky, a cryptocurrency is a system that meets six conditions: 
1. The system does not require a central authority, distributed achieve consensus on its state [ sic ].
2. The system keeps an overview of cryptocurrency units and their ownership.
3. The system defines whether new cryptocurrency units can be created. If new cryptocurrency units can be created, the system defines the circumstances of their origin and how to determine the ownership of these new units.
4. Ownership of cryptocurrency units can be proved exclusively cryptographically .
5. The system allows transactions to be performed in which ownership of the cryptographic units is changed. A transaction statement can only be issued by an entity proving the current ownership of these units.
6. If two different instructions for changing the ownership of the same cryptographic units are simultaneously entered, the system performs at most one of them.
In March 2018, the word " cryptocurrency " was added to the Merriam-Webster Dictionary. 
Decentralized cryptocurrency is produced by the entire cryptocurrency system collectively, at a rate which is defined when the system is created and which is publicly known. In centralized banking and economic systems such as the Federal Reserve System , corporate boards or governments control the supply of currency by printing units of fiat money or demanding additions to digital banking ledgers. In case of decentralized cryptocurrency, companies or governments cannot produce new units, and have not so far provided backing for other firms, banks or corporate entities which hold asset value measured in it. The underlying technical system upon which decentralized cryptocurrencies are based was created by the group or individual known as
Satoshi Nakamoto. 
As of May 2018, over 1,800 cryptocurrency specifications existed.  Within a cryptocurrency system, the safety, integrity and balance of ledgers is maintained by a community of mutually distrustful parties referred to as miners : who use their computers to help validate and timestamp transactions, adding them to the ledger in accordance with a particular timestamping scheme. 
Most cryptocurrencies are designed to gradually decrease production of that currency, placing a cap on the total amount of that currency that will ever be in circulation.  Compared with ordinary currencies held by financial institutions or kept as cash on hand, cryptocurrencies can be more difficult for
seizure by law enforcement.  This difficulty is derived from leveraging cryptographic technologies.
Main article: Blockchain
The validity of each cryptocurrency's coins is provided by a blockchain . A blockchain is a continuously growing list of records , called
blocks, which are linked and secured using
cryptography .  Each block typically contains a hash pointer as a link to a previous block,  a timestamp and transaction data.  By design, blockchains are inherently resistant to modification of the data. It is "an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way".  For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks, which requires collusion of the network majority.
Blockchains are secure by design and are an example of a distributed computing system with high Byzantine fault tolerance .
Decentralized consensus has therefore been achieved with a blockchain.  It sol