This study explores the transformative potential of blockchain technology in revolutionizing marketing practices. With the rise of digital marketing and concerns about privacy, transparency, and efficiency, blockchain offers solutions to these challenges. By leveraging the decentralized and immutable nature of distributed ledgers, marketers can establish trust, enhance security, and foster transparency throughout the advertising supply chain. This research examines various applications of blockchain in marketing, such as verifying ad impressions, combating ad fraud, ensuring data integrity, and optimizing customer reward programs. Through these use cases, blockchain demonstrates its ability to reshape marketing, paving the way for a more accountable, secure, and efficient future.