Tesla CEO Elon Musk is wading back into the cryptocurrency fray, while ARK Investment Management CEO Cathie Wood is sticking her bullish Bitcoin thesis.Using emojis, Musk tweets that Tesla has diamond hands, a term very popular among Reddit's (REDDIT) WallStreetBets community to refer to someone adamant in holding a position.The tweet could refer to Tesla's $1.5B in Bitcoin holdings.Musk roiled markets over the weekend with a Twitter war with crypto fans where one reply led people to believe that his company would liquidate its Bitcoin position. He later clarified that the company had not sold any.Meanwhile, at a Bloomberg Business Week event, Cathie Wood says she still thinks Bitcoin will go to $500K.“I think we are in a risk off period for all assets," Wood said. "The correlations of volatile asserts are going to 1 right now, including Bitcoin. We go through soul searching times like this but our conviction on