Instant Client-Side Hashing

Create blockchain proof

Drop a file or browse

We fingerprint within the browser. Your file never leaves your device.

Verify a file

Paste the transaction ID, then upload the original file to confirm integrity.

Prove ownership instantly. Anchored on Solana.

Secure your intellectual property with immutable blockchain timestamps. Files never leave your browser. Zero-knowledge privacy by design.

Browser-side hashing (SHA-256)
Elliptic Curve Digital Signatures
Verifiable on any Solana Explorer

TRUSTED TECHNOLOGY

1. Drag & Drop

Drag your file into the browser. We calculate a cryptographic fingerprint (hash) instantly. Your file data is never uploaded to any server.

2. Sign & Anchor

Sign the fingerprint with your private key. We then anchor this signature and timestamp onto the Solana blockchain forever.

3. Share Proof

Share your transaction ID. Anyone can use our verifier to confirm you possessed that exact file at that exact time.

Common Questions

Everything you need to know about the technology

Never. We compute the file hash locally in your browser. Only the hash and signatures are recorded.

Your public key proves you created the user signature. The platform signature plus the Solana transaction anchor the proof immutably in time.

Yes. Verification is public: check the hash, user signature, platform signature, and Solana transaction timestamp.

We support standard asymmetric key pairs (ed25519/ECDSA). Keys are generated and stored in your browser's local storage, encrypted with your password.