The next generation of mobile networks, i.e., sixth generation (6G), is expected by 2030, with already burgeoning research efforts toward this goal. Along with various other candidate technologies, blockchain is envisioned to enable and enhance numerous key functionalities of 6G. Thus, the main objective of this article is threefold: to categorize the different aspects of 6G into four emerging directions that anticipate significant advancements leveraging blockchain, to discuss the potential role of blockchainized 6G under each key emerging direction, and to expound on the technical challenges in blockchaining 6G along with possible solutions.