Certify & Verify Workspace

Two boxes, one device. Left: add a document to certify it — images receive a visible GreenQubyte logo plus an invisible watermark, and every file gets an Ed25519-signed receipt. Right: drop any file to authenticate it against the ledger and scan it for the watermark. Files are hashed and processed entirely in your browser — nothing is uploaded.

Account preview

Password

Accounts, API keys & billing arrive with the registry service — this is a non-functional preview.

Certify & watermark

Establish proof of existence. The fingerprint is anchored to RFC 3161 + OpenTimestamps and bound into a signed receipt; images also carry the dual GreenQubyte watermark.

Publisher / Creator (optional)

Drop a file to certify

sha256(file) computed client-side · 0 bytes of content transmitted

Verify & authenticate

Drop a file to re-hash it, check the ledger, and scan images for the visible + invisible GreenQubyte watermark. The SHA-256 ledger match is the authoritative proof.