This document provides a year-end review and analysis of the cryptocurrency market in 2017. It finds that the total market capitalization grew exponentially over the year, with increased trading volumes and high volatility. Bitcoin's market dominance fell below 50% by the end of 2017, while Ripple surged in value and market share to become the second largest cryptocurrency. The review also examines price growth, market breakdowns, and rankings of the top 30 cryptocurrencies by market capitalization for the year.