Who had it first?

Register any file you have: a script, a song, a design, a photo you already took. Your browser works out the file's fingerprint and sends only that. KolTheia records that these exact bytes were registered by you, at this moment, before anyone else, in its public log, with an outside time-stamp. The file itself never leaves your device.

Choose a file or drag it here

Any kind of file, up to 2 GB. Only its fingerprint is sent.

What a registration proves, and what it does not. It proves these exact bytes existed by then and that your account registered them before anyone else. Change one byte (re-save, crop, convert) and it is a different file with a different fingerprint. It does not prove the file is real, how it was made, or that you made it. To prove a photo or video is real, take it with the KolTheia camera instead: that is a capture, with its own certificate.