Blockchain prediction markets such as Augur and Polymarket are exploring ways to increase liquidity and attract more users. Augur was the first on-chain prediction market, but its product failed to deliver on its promise due to poor user experience and high gas fees. However, as block space has become cheaper and order book designs have become more efficient, we have made great progress. Polymarket is the leader in the emerging market with ~$900 million in trading volume. How prediction markets work, current bottlenecks that need to be addressed for further mass adoption, and some of the ways we think they can be addressed are the focus of current blockchain prediction market research.