Proof creates tamper-evident, timestamped records of anything you need to document — sealed with a cryptographic hash.
No account. No cloud. No subscription. Legally binding acknowledgements. Free to download.
Features
Built for people who need credible, shareable evidence — not complexity.
Every proof record is sealed with a SHA-256 fingerprint computed from your photos, timestamp, location, and notes. Any tampering after the fact breaks the seal.
Immediately after sealing, your hash is submitted to Apple's Timestamp Authority — an independent, trusted third party that certifies your record existed at that exact moment. No one can dispute the time.
Your hash is anchored to the Bitcoin blockchain via OpenTimestamps — providing a permanent, decentralised timestamp that no single party controls or can alter.
Records are stamped with precise GPS coordinates and a human-readable address, verified at the moment of capture — not editable afterward.
Capture photos and video right from the app, scan multi-page documents with automatic edge detection, or import from your library. All files are included in the hash.
Request a legally binding e-signature from any recipient. They verify their identity with a one-time code sent to their email — creating a tamper-evident record of who acknowledged, when, and from where.
Once acknowledged, generate a formal Certificate of Evidence PDF combining the proof record, acknowledger identity, verified email, timestamps, and TSA verification status — ready for legal use.
Share a single-page PDF containing photos, metadata, GPS coordinates, the full SHA-256 hash, and — if you've requested acknowledgement — a scannable QR code linking to the acknowledgement form.
Back up your vault to your personal iCloud account. Restore automatically on a new device. Your data — not ours.
Export one or more proof records as a single .proofvault file and share it directly with another Proof user via AirDrop, Files, or any share sheet. Received records are stored locally and display their full history — including any acknowledgement — in read-only form.
How It Works
No account setup. No learning curve. Just document and share.
Take a photo, scan a document, or record a video. Add notes, tags, and select a category. GPS location and timestamp are locked in automatically.
Tap "Seal It." Proof computes a SHA-256 hash of all your data, then immediately requests an RFC 3161 trusted timestamp from Apple's TSA and anchors the hash to the Bitcoin blockchain.
Share a secure link. Your recipient reviews the proof, enters their name and email, verifies a one-time code, and taps Acknowledge — creating a legally binding electronic signature under the E-SIGN Act.
Once acknowledged, generate a formal Certificate of Evidence PDF. Share it via AirDrop, email, or save it for legal proceedings. Every detail is independently verifiable.
Pricing
Core features are always free. Plus and Pro unlock advanced capabilities with a one-time purchase — no subscription, ever.
Everything you need for everyday documentation.
One-time purchase. For when things get serious.
One-time purchase. Unlimited everything for professionals.
Privacy First
Proof was built with a simple rule: your data never leaves your device unless you share it.
No sign-up, no email, no password. Open the app and start documenting.
Zero third-party SDKs. We have no idea who you are or how you use the app.
All data lives on your iPhone. iCloud Backup goes to your iCloud — not ours.
Free to download. Optional one-time purchases unlock more features. No recurring fees. Ever.
Available on iPhone and iPad. Free to download — no account required.
Free · iOS 17+ · iPhone & iPad · No account required