Watch the Satohash explainer
Satohash hashes your file on the device, then anchors the fingerprint to Bitcoin via OpenTimestamps — independently verifiable proof that a file existed at a specific moment. Free, private, no account required.
- Zero-knowledge — your file never leaves your device, only a SHA-256 fingerprint.
- Free & private — no account, no middleman, no trust required.
- Independently verifiable — anyone can check your proof on Bitcoin.