The first cryptocurrency to capture the public imagination was Bitcoin, which was launched in 2009 by an individual or group known under the pseudonym, Satoshi Nakamoto. As of February 2019, there were over 17.53 million bitcoins in circulation with a total market value of around $63 billion (although the market price of bitcoin can fluctuate quite a bit). Bitcoin's success has spawned a number of competing cryptocurrencies, known as "altcoins" such as Litecoin, Namecoin and Peercoin, as well as Ethereum, EOS, and Cardano. Today, there are literally thousands of cryptocurrencies in existence, with an aggregate market value of over $120 billion (Bitcoin currently represents more than 50% of the total value).

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A lot of people have made fortunes by mining Bitcoins. Back in the days, you could make substantial profits from mining using just your computer, or even a powerful enough laptop. These days, Bitcoin mining can only become profitable if you’re willing to invest in an industrial-grade mining hardware. This, of course, incurs huge electricity bills on top of the price of all the necessary equipment.

Founded in 2014, Poloniex is one of the world’s leading cryptocurrency exchanges. The exchange offers a secure trading environment with more than 100 different Bitcoin cryptocurrency pairings and advanced tools and data analysis for advanced traders. As one of the most popular trading platforms with the highest trading volumes, users will always be able to close a trade position. Poloniex employs a volume-tiered, maker-taker fee schedule for all trades so fees are different depending on if you are the maker or the taker. For makers, fees range from 0 to 0.15%, depending on the amount traded.
While it’s very easy to buy Bitcoins - there are numerous exchanges in existence that trade in BTC - other cryptocurrencies aren’t as easy to acquire. Although, this situation is slowly improving with major exchanges like Kraken, BitFinex, BitStamp and many others starting to sell Litecoin, Ethereum, Monero, Ripple and so on. There are also a few other different ways of being coin, for instance, you can trade face-to-face with a seller or use a Bitcoin ATM.
As described in their whitepaper, Augur has set out to create the first decentralized, open-source platform for prediction markets. Based on the ideas of game theory and wisdom of the crowd, prediction markets achieve greater forecasting accuracy than any individual experts can. However, the problem with previously existing prediction markets is that they were all centralized.

Auch die Plattform Ohlala, auf der „private Dates“ vermittelt werden, setzt auf die alternative Crypto Trading Kapitalbeschaffung. Sie will mit ihrem ICO 100 Millionen Dollar einnehmen. Die Gründerin berichtet in einem Video, dass sie – wohl aufgrund des heiklen Themas, dem sie sich widmet – von einer wichtigen Konferenz ausgeladen wurde. Das zeige, wie schwer es sei, auf klassische Art und Weise mit Investoren ins Gespräch zu kommen.

When issuing a transaction in IOTA, you validate 2 previous transactions. This means you no longer outsource validation to miners which requires wasteful amounts of computing power and usually a large stake of coins. These required resources are, in effect, centralizing the currencies which many believe were created to be decentralized in the first place.  

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The first decentralized cryptocurrency, bitcoin, was created in 2009 by pseudonymous developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, as its proof-of-work scheme.[14][15] In April 2011, Namecoin was created as an attempt at forming a decentralized DNS, which would make internet censorship very difficult. Soon after, in October 2011, Litecoin was released. It was the first successful cryptocurrency to use scrypt as its hash function instead of SHA-256. Another notable cryptocurrency, Peercoin was the first to use a proof-of-work/proof-of-stake hybrid.[16]