Prooflens · FAQ

No. Photos are captured, watermarked, and hashed locally on your device. To create a timestamp, Prooflens transmits only the photo's SHA-256 hash — a one-way fingerprint from which the original image cannot be reconstructed.

Prooflens provides a cryptographic proof of existence — that a photo existed at a given time and hasn't been altered. It is technical evidence, not legal advice; whether it's admitted depends on the evidentiary rules of each jurisdiction.

Capture, watermarking, and hashing work fully offline. Obtaining an RFC 3161 timestamp and blockchain anchoring require a connection; when offline, proofs queue locally and complete automatically once you're back online.

OpenTimestamps is a free, open protocol. Many proofs are aggregated into a single Bitcoin transaction, so anchoring carries no per-proof cost to you.