Today, (Thursday, 15 June) prices for Bitcoin, Ethereum and the majority of Cryptocurrencies are nosediving. It started yesterday, actually. I tried searching for what the reason could be. So far here are potential contributors:
1. There is an announcement that some mining company is going to fork Bitcoin.
So what? They split Bitcoin, then you just choose which version you like right? It is no reason to panic now.
2. Some politicians in Europe and America want to regulate Bitcoin and Cryptocurrencies.