If you decide to invest in cryptocurrencies, Bitcoin is obviously still the dominant one. However, in 2017 its share in the crypto-market has quite dramatically fallen from 90 percent to just 40 percent. There are many options currently available, with some coins being privacy-focused, others being less open and decentralized than Bitcoin and some just outright copying it.
Founded in 2011, Kraken is the largest Bitcoin exchange in euro volume and liquidity and is a partner in the first cryptocurrency bank. Kraken lets you buy and sell bitcoins and trade between bitcoins and euros, US Dollars, Canadian Dollars, British Pounds and Japanese Yen. It’s also possible to trade digital currencies other than Bitcoin like Ethereum, Monero, Ethereum Classic, Augur REP tokens, ICONOMI, Zcash, Litecoin, Dogecoin, Ripple and Stellar/Lumens. For more experienced users, Kraken offers margin trading and a host of other trading features. Kraken is a great choice for more experienced traders. Check out the Kraken FAQ

Among the Asian countries, Japan is more forthcoming and regulations mandate the need for a special license from the Financial Services Authority to operate a cryptocurrency exchange.[24][25] China and Korea remain hostile, with China banning bitcoin miners and freezing bank accounts.[26][27] While Australia is yet to announce its conclusive regulations on cryptocurrency, it does require its citizens to disclose their digital assets for capitals gains tax.[28]
They’re committed to safe and secure trades, because at the end of the day, you’re trusting your money with them. They understand that, and they take that very seriously. Their system is 100% proprietary, has been stress tested and DDoS tested, and they have never lost a single coin. They also maintain a ledger themselves in the interest of ensuring that they know where every coin – whether Canadian or ethereum – is at all times.
If your focus is to conduct crypto-to-crypto trading, Binance is one of the best options. Ranked as one of the most popular cryptocurrency exchanges worldwide, they provide you with impressive offerings along with an extremely low trading fee. Although the Binance platform is a young entrant into the market, it is rapidly growing, and holds a huge selection of altcoins with Bitcoin, Ethereum, and Tether pairings.
Unlike ordinary money, cryptocurrency prices are highly volatile, so the rate may fluctuate. It may happen that the altcoin exchange rate which you see before the transaction is different (high or low) after transaction gets completed. In that case, the exchanged digital currency quantity which you receive may differ from what you see during the comparison.
In 1998, Wei Dai published a description of "b-money", characterized as an anonymous, distributed electronic cash system.[12] Shortly thereafter, Nick Szabo described bit gold.[13] Like bitcoin and other cryptocurrencies that would follow it, bit gold (not to be confused with the later gold-based exchange, BitGold) was described as an electronic currency system which required users to complete a proof of work function with solutions being cryptographically put together and published. A currency system based on a reusable proof of work was later created by Hal Finney who followed the work of Dai and Szabo.[citation needed]