The world is experiencing a dramatic transformation as a result of the emergence of intellectual information technology among the main industries where high-end user engagement is anticipated to boost service qualities in all fields. Blockchain is one of the most brilliant technology enablers to overcome most of the current limitations and provide the functional needs of 6G. This chapter examines the importance of blockchain in tackling pressing 6G concerns as well as potential future applications and new research fields like artificial intelligence, data storage and analytics, and internet of everything. In addition to offering a solitary answer for application security and privacy, blockchain also has its own unique set of security and privacy flaws. This chapter examines the advantages, drawbacks, and possible routes for getting through the obstacles associated with using blockchain in 6G.