Besides Bitcoin and Ethereum, other cryptocurrencies by market capitalization include Bitcoin Cash, IOTA, Ripple and Litecoin. Until 2017, Bitcoin was dominating the cryptocurrencies market with a huge advantage, usually reaching over 90% of the total market capitalization of all cryptocurrencies. However, since the start of the year, many other cryptocoins have been growing in valuation dramatically. The most significant spikes happened in May and June 2017, when Bitcoin's total valuation went below the valuation of a total of all other cryptocurrencies for the first time in history, and more recently, when the total market cap of all cryptocurrencies reached its peak of $605 billion on 18th December 2017 [2].