Ethereum co-founder Vitalik Buterin revealed he earned $70,000 in 2025 through strategic trades on the prediction market Polymarket. Using a principal of $440,000, Buterin capitalized on market sentiment by betting against improbable events, such as Donald Trump winning the Nobel Peace Prize. His approach involves identifying overestimated probabilities and leveraging rationality to profit from sentiment-driven market fluctuations. Buterin's trading strategy, which he discussed in a recent interview, focuses on shorting sentiment-driven events. His account, believed to be under the name 'momom', primarily bets on events not occurring, avoiding cryptocurrency and sports-related predictions. This method, optimized through mathematical models like the Kelly criterion, has proven effective in navigating the unpredictable landscape of prediction markets.