The application of Blockchain technologies to real time communications networks has created many new challenges and opportunities. One of the objectives for 6G wireless is to create a real-time and massive Blockchain system as a foundational platform for the trustworthiness of network operations, hence, the 6G-Blockchain will be the basis for the traceable PoW (proof-of-work) mechanism to ensure the trust, such that every real-time data session, and every real-time signaling operation will be recorded on the public ledger, such as permission based hyper-ledger. In this talk, firstly we discuss the challenges of 6G-Blockchain to connect trillions of the IoT devices with good faith of security, integrity and privacy; secondly, we discuss the fundamental real-time challenges for the 6G-Blockchain with respect to the its latency, its throughput and its scalability; thirdly, we propose a comprehensive zero-knowledge verification system, a.k.a. zk-Faric system, for providing a real-time privacy preserving framework to improve the usability and scalability of the 6G-Blockchain; Lastly , we propose a computational trust-metric model as the consensus mechanism for the 6G-Blockchain.