Vitalik Buterin has called for stricter data verification measures following a manipulation incident on Polymarket's Paris weather market. A man reportedly used a hairdryer to influence the market, earning approximately $34,000. Buterin emphasized the need for using the median of at least three independent sources for critical systems to prevent such manipulations. This incident follows a similar event involving Polymarket's prediction markets on the Ukraine conflict. An unauthorized edit to the Institute for the Study of War's map led to incorrect market settlements, resulting in significant payouts. Buterin's comments highlight the importance of robust data validation in prediction markets to ensure fair outcomes.