If we cannot predict something, that doesn't mean that it is random. Randomness will only occur if there are absolutely no external factors that can influence something, which, is almost impossible. There are factors that influence the decay of atoms, we are just not aware of them (I believe). Albert Einstein also did not believe in randomness. Some physicists believe that there is such a thing as randomness, however, not everyone believes it. Even those that believe there is randomness state that it is not the randomness as we know it.

This is from an article on randomness: "On the BBC Radio broadcast, professor Colva Roney-Dougal of the University of St. Andrews says, “I can never prove that a sequence is random, I can only prove that it looks random and smells random.” Only if something is proven to be random, it will be random to me.

As for the relevance of this to this post, there are many factors that determine the crypto market. Economies, merges, forks, tax, countries compliance etc. These factors are far from random. If you had eyes and ears to know what is going on everywhere, then you can predict what is going to happen with the crypto market. Unfortunately we can't, however, we have a pretty good idea of what has happened, using mathematics we can make educated guesses. To us it is random, however, the crypto market is not random. The market does not just go up or down just because.

Here are some links on the subject.

https://www.physicsforums.com/threads/does-random-exist.246043/
http://www.askamathematician.com/2009/12/q-do-physicists-really-believe-in-true-randomness/
https://philosophy.stackexchange.com/questions/29364/does-true-randomness-actually-exist