Video files: temporary storage only
When you upload a video (or paste a URL, which we fetch server-side), the file is stored temporarily in Cloudflare R2. Access requires a random URL with a server-generated signature and fixed expiry. Copies fetched from pasted URLs expire after 20 minutes and are deleted after verification. Local uploads may remain for up to 24 hours so the result notification can include a signed preview link. Expired objects are removed on access, by scheduled cleanup, and by the R2 lifecycle policy. We never reuse your video for anything else.
Verification providers
The temporary URL is submitted to the official ModelArk artifact verification API at both Volcengine (cn-beijing) and BytePlus (ap-southeast-1). Per their official documentation, files fetched for verification are used only for that query, deleted on their side within 24 hours, and not used for model training. Their processing is additionally governed by their own terms and privacy policies.
What we keep after a check
We keep a SHA-256 fingerprint of the file (a hash, from which the video cannot be reconstructed), the verification outcome (detected / not detected / undetermined, plus the model name when returned), and the optional platform tag you choose to submit. Hashes let repeat checks of the same file return instantly without re-processing, and platform tags feed aggregated statistics. None of this includes permanently stored video content. Local upload bytes exist only during the temporary window above.
Identifiers and rate limiting
To keep the free service available we enforce daily limits using a random client ID stored in your browser's localStorage (you can clear it at any time) and a one-way hash of your IP address. When human verification is enabled, Cloudflare Turnstile processes connection data to distinguish people from bots. Operational result notifications sent to our private Feishu workspace may include your full IP address, full client ID, country code, referring-site origin, landing-page path, campaign parameters (URL query tags such as utm_* and gclid/fbclid), selected language, input method and a coarse browser/OS/device category. This notification context is removed from our task database after 24 hours. We run no advertising trackers and set no analytics cookies.
Your responsibility
Upload only videos you are authorized to process. Do not upload sensitive, illegal or private material without permission. Results are automated analysis for reference only.
Contact
Questions or removal requests (for example, deleting the stored hash record of a file you own): contact@checkseedance.com.