Your content never leaves your device. The browser computes SHA-256 locally and sends only the 32-byte hash through a server-side proxy. No upload, no account, no login.
ExistBefore creates cryptographic proof that your content existed at a specific time — before approval, before registration, before publication. You get an immediate ECDSA signature (T0), followed by a qualified eIDAS timestamp (T1) and a Bitcoin anchor (T2).
It does not prove authorship or ownership. It proves a fact: this specific sequence of bytes existed at this moment.
Works with any digital content
- Brand names
- Logo previews
- Creative mockups
- Fashion prototypes
- Campaign visuals
- Contracts & NDAs
- AI prompts
- Photographs
- Audio & video
- PDF documents
- Code & designs
- Any file