This blog post evaluates the effectiveness of C2PA's 'sidecar' system for metadata attribution and authenticity. It argues that despite initial intentions to allow for smaller file sizes while validating media, the sidecar method ultimately fails due to inherent weaknesses, such as enabling undetectable alterations and providing no assured associations between metadata and visual content. The post includes empirical tests demonstrating the limitations of sidecars in validating media signatures, raising concerns about potential misuse for false attribution and user tracking.