Fake news has become a significant problem in today's online world. Misinformation is easily propagated through online social media platforms. It is essential to curb the spread of fake news. Blockchain has provided a framework for tamperproof and traceable data, and can therefore be used for developing a news platform. Applying blockchain technology to news tracing has formed the groundwork for supressing the spread of fake news. However, the scale of online platforms and the characteristics of blockchain add several new challenges that hinder the real world deployment of such solutions. This study reviews various blockchain based methods that combat the spread of fake news on online platforms and discusses the challenges faced in realizing such solutions.