Determining authenticity of digital content

A computer-implemented method, comprising:

• obtaining video and a plurality of digital signatures, the video associated with a recording device, the video comprising a plurality of video frames, each video frame of the plurality of video frames associated with a respective digital signature, wherein the plurality of video frames form a chain of frames such that modification of an intermediate frame in the chain of frames is detectable based at least in part on an attempt to authenticate a digital signature of an adjacent frame to the intermediate frame, wherein:
• a previous video frame of the video includes an image;
• and
• the respective digital signature is based on:
• image content of the video frame;
• a hash value of an entirety of the image of the previous video frame;
• and
• a cryptographic key associated with the recording device;
• performing verifications of the plurality of video frames, using the plurality of digital signatures;
• indicating, based on the verifications, whether the digital signatures indicate authenticity of both content of the video and an ordering of individual frames of the video;
• obtaining metadata associated with the video frame, the metadata indicating one or more algorithms used to modify the content of the video frame;
• retrieving an unmodified version of the video frame;
• applying the one or more algorithms to the unmodified version;
• and
• determining authenticity of the image content of the video frame based at least in part by comparing the image content of the video frame and content of the unmodified version applied with the one or more algorithms.

A non-transitory computer-readable storage medium storing thereon executable instructions that, when executed by one or more processors of a computer system, cause the computer system to at least:

• obtain a video comprising a first frame and a second frame of a plurality of frames, the video being associated with a recording device, the first frame including an image, wherein the plurality of frames form a chain of frames such that modification of an intermediate frame in the chain of frames is detectable based at least in part on an attempt to authenticate a digital signature of an adjacent frame to the intermediate frame;
• calculate a hash of an entirety of the image;
• determine whether content of the second frame is authentic and whether the order of the second frame in the video is correct relative to the first frame using a digital signature associated with the second frame, the digital signature associated with the second frame based at least in part on:
• the hash of the entirety of the image;
• the content of the second frame;
• and
• a cryptographic key associated with the recording device;
• indicate whether the second frame is authentic and in order relative to the first frame;
• obtain metadata associated with the second frame, the metadata indicating one or more algorithms used to modify the content of the second frame;
• retrieve an unmodified version of the second frame;
• apply the one or more algorithms to the unmodified version;
• and
• determine authenticity of the content of the second frame based at least in part by comparing the content of the second frame and content of the unmodified version applied with the one or more algorithms.