In this thesis I investigate the extent to which we can predict the market outcomes of cryptocurrencies. I focus on the two currently most prominent cryptocurrencies: Bitcoin and Ethereum. In the first part of the thesis I investigate whether the price levels of Bitcoin and Ethereum satisfy the weak form of the Eicient Market Hypothesis. I find evidence of weak-form eiciency in the market for cryptocurrencies. In the second part of the thesis I ask whether cryptocurrencies are viewed as an hedging vehicle against the mainstream economy. To answer this question I explore the association betweenmarket outcomes for Bitcoin and Ethereum and the Yield Curve. I find limited evidence of an association between the cryptocurrencies market and the Yield Curve. In the third part of the thesis I ask whether the market for cryptocurrencies is driven by noise traders. To answer that I explore the association between market outcomes for cryptocurrencies and qualitative information from Google searches. I find evidence of strong predictability of the price and transaction volume of Bitcoin by indexized Google searches, suggesting that the fashionability and popularity of Bitcoin go hand in hand.