Abstract: In various embodiments, systems and methods for generating attested video image data are provided. In some embodiments, an ISP pipeline incorporates a secure cryptographic signing mechanism to digitally sign content-based outputs in a way that attests to the authenticity of the process by which the content was processed before output from the camera. The ISP pipeline may include a hardware security module that inputs video image data from an image sensor, and generates an attestation package that includes attestations about the video content, in combination with an attestation of how it was produced, and signs those attestations together using a key to produce an output comprising attested media data. The ISP pipeline may apply supplemental attestations to the attestation package representing facts associated with the video content that evidence the authenticity. The digital signature applied to the attestation package may use a zero-knowledge proof to describe the signing key.