Which model made this video?
A free check for AI video. Every Seedance clip, as BytePlus delivers it, carries a signed C2PA record of the model that made it and who issued the signature. Images from ChatGPT and Seedream carry one too. Drop a file and we read that record right here in your browser — the file never leaves your device.
Nothing is uploaded. No sign-in. The check reads Content Credentials (C2PA), the open standard for media provenance.
Checking…
Technical details
The request id is the generation's id in the BytePlus account that made it: the owner of that key can find the take by it.
Make yours the same way — Longtake runs Seedance on your own BytePlus key.
What you get back
One plain answer, then the evidence. If the file can’t tell us, we say so instead of guessing — a missing signature is not proof of a fake.
Questions
- What are Content Credentials?
- Content Credentials (the C2PA standard) are a signed record inside a media file: who made it, with what tool, and when. BytePlus writes one into every Seedance video, naming the exact model, and signs it with its certificate.
- I paid for Seedance 2.5 on another site. Was it really 2.5?
- If you check the file exactly as it was downloaded, its signature names the model that rendered it. A re-encoded file has no signature left, so nothing can be confirmed either way.
- Why does my video say “No Content Credentials”?
- Editing apps, social networks and messengers re-encode video and drop the record. That doesn’t mean the video is fake — check the original download instead.
- Could someone just write “Seedance” into a file?
- They can write anything, but they can’t produce BytePlus’s signature. A changed file shows as changed after signing, and a signature from anyone else shows as not from the model’s maker.
- Does it check Veo, Sora or Firefly?
- Partly. Google signs Veo and Gemini videos with a certificate on the C2PA trust list, so the page confirms the signature is Google’s — but Google’s record doesn’t name the model. Pictures from ChatGPT and GPT Image carry OpenAI’s signature and are confirmed the same way. Other companies whose certificate comes from an authority on the C2PA or Content Authenticity Initiative trust lists are confirmed the same way. We haven’t tested Sora or Firefly files yet. A signature we can’t trace to those lists shows as not trusted.
- Do you see or keep my video?
- No. The page reads the file inside your browser and never sends it anywhere. If you allow analytics, we count how the check went — the outcome, the model a genuine signature names, the file type and a rough size bracket — never the file itself, its name or its exact size.
- How is this different from contentcredentials.org/verify?
- Both read the same standard. This page is made for AI video: it names the model in plain words, checks that the signature belongs to the company that runs that model, and tells a cut-short download apart from an edited file.
Every Seedance take in Longtake is signed by BytePlus. You pay their price, nothing on top.