Media authenticity

Real creators. Real content. Verified.

AI makes it easy to fake influencer content. Authena gives you a simple, cryptographic way to prove what’s real—without uploading files.

Sign contentVerify content

How Authena works

Four simple steps: Export → Sign → Share → Verify

How Authena works: export, sign, share link, verify

What Authena does

Authena proves two things brands need:
Provenance — a real creator signed this asset, with a tamper-evident manifest.
Integrity — the file you received is bit-for-bit identical to what the creator delivered.

Secure by design

  • No uploads: we only compute a fingerprint (SHA-256) in your browser.
  • Cryptographic signatures: Ed25519 signatures with timestamped manifests.
  • Transparent verification: link for provenance, file upload for integrity.
  • Future-proof: built to align with C2PA standards.
Your media never leaves your device. We store only a signed fingerprint and manifest.
Zero uploads
Privacy-first: we hash locally in your browser.
Cryptographic proof
Ed25519 signatures + timestamp. Downloadable manifest.
One-click verify
Share a link, or verify by file. Tamper detection by hash.
“We finally have a simple way to prove creator authenticity to clients.”
— Managing Director, Social Agency
“I send the link with every delivery. It speeds up approvals and protects my work.”
— UGC Creator
“The file check caught a re-encode we’d have missed. Instant trust.”
— Brand Creative Lead

Get early access

We’re onboarding creators and agencies. Join the waitlist:

FAQ

Do you upload or store my video?
No. We only compute a fingerprint (SHA-256) locally, then store a signed manifest.

What if the file is edited after signing?
Even tiny edits change the fingerprint. Verification by file will show “Not verified.”

Can an agency integrate this later?
Yes. We’ll offer an API and C2PA alignment. The PoC shows the core: provenance + integrity.

Start signingVerify a file