In April 2026, a video began circulating across Indian social media showing Finance Minister Nirmala Sitharaman personally endorsing an investment scheme that promised turning an initial ₹22,000 into ₹5.5 lakh within a week. She never said any of it. India's Press Information Bureau fact-checking unit debunked the clip within days, and an independent analysis from Hive Moderation put the odds it was AI-generated at 99.9% — but the claim had already reached however many people saw it and believed it before anyone ran a single check. Video is the modality where a convincing fake now costs almost nothing to produce and, unlike a still photo, carries a voice too, which is exactly why it deserves the same real-systems-first discipline our guide to checking whether an image is AI-generated already applies to pictures — extended to what actually works, and doesn't yet, for something that moves.
Two systems built for video — and the generator that just lost its provenance argument
Two of the mechanisms already covering images now reach video too, though neither is finished rolling out. C2PA Content Credentials — the signed manifest naming which tool made a file — reads MP4 and MOV files directly at verify.contentauthenticity.org, and Google says Pixel 8, 9 and 10 phones are gaining video credentials of their own. SynthID, Google's pixel-level watermark, already covers video inside the Gemini app; Google's own May 19, 2026 announcement said the wider Chrome and Search rollout for video specifically was still "coming months" out, so a browser right-click check that works instantly on a photo may not yet on a clip. The generator landscape shifted underneath all of this at the same time: OpenAI discontinued the Sora app in April 2026 and is retiring the Sora API on September 24, 2026 — after independent testing by researcher Ethan Le Sage in November 2025 found Sora's own C2PA metadata missing on downloads that kept their visible watermark, present only once a paid account removed it, the reverse of what a provenance system is supposed to guarantee. Most of what circulates today instead comes out of Google's Veo, Kuaishou's Kling, or MiniMax's Hailuo — three systems with three different track records on actually labeling their own output.
Check a video in this order
- Download the actual video file rather than working from a screen recording, a social-media repost, or a clip forwarded through a messaging app. Both C2PA metadata and, to a lesser extent, SynthID's watermark can be stripped or damaged by re-encoding.
- Open verify.contentauthenticity.org and drop the file in — it reads MP4 and MOV directly in your browser. If a manifest exists, it names the generating tool and shows what's been done to the file since.
- Upload the file to the Gemini app and ask whether it was created or altered by Google AI — SynthID verification there covers video as well as images and audio.
- Run the clip through a free tool like InVID-WeVerify (weverify.eu/verification-plugin), a browser extension built for journalists that pulls the strongest keyframes and reverse-searches each one across Google, Bing, TinEye and Yandex at once.
- "A signed manifest names Google's Veo" is a fact. "No watermark, so it's probably real" is a guess dressed as a finding.
Which of those five steps to start on depends on what you're actually holding — a link, a download, or a clip someone forwarded you.
Start where the evidence still exists
The three checks, side by side
C2PA, SynthID, and reverse-frame search answer different questions
| C2PA / Content Credentials signed file metadata | SynthID pixel-level watermark | Reverse-frame search prior-publication check | |
|---|---|---|---|
| What it actually checks | A manifest embedded in the file, naming the tool and edit history | A statistical pattern embedded in the video's pixels at creation | Whether keyframes from this exact clip have a prior, dated appearance online |
| Survives a repost or re-encode | No — most social platforms strip it on upload | Often, by design — built to survive cropping and recompression | Not applicable — works from the pixels, not a file's history |
| Where to check it | verify.contentauthenticity.org | The Gemini app | InVID-WeVerify (weverify.eu) |
| What a clean result actually proves | That specific tool was involved, if the manifest is present and unaltered | That Google's Veo was involved, if a match is found | That this footage, or a close match, existed before now |
None of these three replace judgment — they narrow it, and video is the modality where judgment alone fails the most. A 2025 industry-commissioned study of 2,000 UK and US consumers, run by the identity-verification firm iProov, found just 0.1% of participants correctly identified every synthetic clip and image they were shown — even though they'd been told going in that some of it was fake. That's the actual argument for running the real checks in order instead of trusting a gut read on blinking, hands, or lip-sync, all of which today's better generators have already been trained against.
Where this check breaks
Five ways this check gets called done when it isn't
None of this makes spotting an AI video effortless — it makes it checkable, which is the more honest goal. This is the fourth of a kind, after our guide to checking whether an image is AI-generated, our guide to checking whether text was written by AI, and our guide to checking whether a phone call is AI-cloned — and it's also the one where the underlying industry moved fastest while this series was being written: Sora is gone, and whatever comes next from OpenAI will have to earn back the provenance trust its predecessor didn't keep. For claims rather than authorship, our guide to catching an AI assistant when it's making things up is the one to reach for, and the dictionary has short entries for the terms used here — manifest, watermark, provenance — if any of it needs unpacking further. The same underlying harm aimed at a different target is what forced San Francisco's order pulling nudify apps from Apple's and Google's app stores.
- Check for a signed C2PA Content Credentials manifest first — it now reads video files directly.
- Google's SynthID watermark covers Veo video too, and the Gemini app can check it.
- A repost or screen recording strips both signals before you ever see the file.
- No metadata left? Reverse-search the video's actual frames with a free tool like InVID-WeVerify.
- Caveat: no signal found doesn't mean a video is real — only that this check found nothing.