cryptocurrency

1.  WHAT IS CRYPTOCURRENCY ?

Cryptocurrency is a currency which is not exist in physical form. It is only available in virtual form.and it is available in all the country and it is very valuable.

And it is encrypted form of money and it is very secure.

And the value of the cryptocurruency were change according to the demand and supply .

History

 After seeing all the centralized attempts fail, Satoshi tried to build a digital cash system without a central entity. Like a Peer-to-Peer network for file sharing.

This decision became the birth of cryptocurrency. They are the missing piece Satoshi found to realize digital cash. The reason why is a bit technical and complex, but if you get it, you‘ll know more about cryptocurrencies than most people do. So, let‘s try to make it as easy as possible:

To realize digital cash you need a payment network with accounts, balances, and transaction. That‘s easy to understand. One major problem every payment network has to solve is to prevent the so-called double spending: to prevent that one entity spends the same amount twice. Usually, this is done by a central server who keeps record about the balances.

In a decentralized network, you don‘t have this server. So you need every single entity of the network to do this job. Every peer in the network needs to have a list with all transactions to check if future transactions are valid or an attempt to double spend.

The trend of cryptocurrency was start in the 21century and now the most valuable currency in the world .

Block chains

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.[13][16] Each block typically contains a hash pointer as a link to a previous block,[16] a timestamp and transaction data.[17] 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".[18] 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.[19] It solves the double spending problem without the need of a trusted authority or central server.

The block time is the average time it takes for the network to generate one extra block in the blockchain.[20] Some blockchains create a new block as frequently as every five seconds.[21] By the time of block completion, the included data becomes verifiable. This is practically when the money transaction takes place, so a shorter block time means faster transactions.[citation needed]
here is the link of websites 
https://bitcoin.org/en/

Types of cryptocurrencyes

1.  Bitcoin

2.  Litecoin

3.  Ethereum

4.  Z cash

5.  Dash

6.  Ripple

7.  Monero

All the currency have their own price of sell and buy.

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