Final answer:
Proof behind the CBM refers to the interconnectedness and continuity of the Marvel Cinematic Universe (MCU), highlighted by films like Iron Man and Black Panther, demonstrating a unified storyline across multiple character-centric movies.
Step-by-step explanation:
The phrase 'proof behind the CBM' likely refers to evidence or justification that supports the existence of the Marvel Cinematic Universe (MCU) and its continuity. One form of proof is the interconnected nature of the MCU films, where characters from one movie appear in others, creating a unified storyline. The MCU started with Iron Man in 2008 and has grown to include a wide range of character-specific films, including origin stories like Black Panther. These films build upon one another, with each installment contributing to a larger narrative and universe. Thus, the proof of the MCU's continuity and existence can be seen in the way these films reference each other and exist within a consistent world, with Black Panther being one part of the larger MCU tapestry.