Cryptocurrency are a digital asset class created (in most cases) by a decentralized blockchain. Invented by the pseudonomous Satoshi Nakamoto, the first Blockchain, Bitcoin, reached an early peak late 2013, when it rose from a market capitization of 2bn USD to 15bn USD in less than 3 months. Followed by a rapid crash to 10bn (2/3) and a slow decline the following 2 years.

Since 2016 a new boom is emerging steadily, while the "Bitcoin dominance" went down with accelerating spead in favor of a more diverse currency portfolio. 

While one could argue this diversification leads to more stability, the application of cryptocurrency is still an open question. Are they more than a speculative asset? Or will the current boom eventually burst because there is simply no buyer left?