This whole thing is very interesting. The underlying blockchain technology isn't going away, so investing in that is still very speculative at this point, but at least there is some type of underlying fundamental as a basis. Many of the larger financial companies are looking at how to adapt blockchain, and from what I understand the technology isn't going away, so a spec investment if you have a few grand lying around isn't a bad idea. The cryptocurrency itself has no fundamentals to rely on, or maybe you can say its tied to the blockchain and move together, so that is its fundamental? Invest in that if your swimming in cash, bored, and losing won't break the bank.