PresenceProof · Cryptographic Proof of Presence
Who. Where. When.
Proven.
One tap on your Apple Watch generates a cryptographically signed, hardware-attested record of your exact location — sealed to the solar second.
Products
Recorder · Apple Watch + iPhone
ProveMeHere
One tap. Your location, the time, and the exact solar context sealed by two independent Secure Enclaves and Apple's hardware attestation.
Verifier · Web + App
VeriPlace
Scan the QR. See the proof. No app required. The verification page runs the full cryptographic check in your browser — nothing leaves your device.
Infrastructure · Backend
PresenceVault
RFC 3161 timestamping, sealed certificate escrow, and permanent verification URLs — with zero access to your location or identity data.
How It Works
Tap on your Watch
Choose your label — SHOT, ANCHORED, DEPARTED — and tap. The watch is already authenticated. No prompts, no delay.
Two devices sign
Watch and iPhone each sign the payload independently with their own Secure Enclave keys, both attested by Apple.
Solar context sealed
The exact solar position is computed on-device and baked in — morning civil twilight, +2 min 14 sec after begin.
QR displayed
A QR code fills the watch face. Show it. The warden scans with any camera — no app needed on their end.
Verified in browser
Full ECDSA signature checks run in the browser. No server call. No data transmitted. Works on Android.
Both parties keep records
Recorder's log and verifier's signed receipt stored independently on each device. No central database.
Who Uses PresenceProof
Hunters
Legal shooting hours · State DNR
Legal shooting hours are defined by civil twilight in most states. ProveMeHere proves you were in legal light at the moment of harvest — to the second, with your exact location.
Boaters
Navigation lights · COLREGS / USCG
Navigation lights are required from end of evening civil twilight to beginning of morning civil twilight. Log your departure and return. Show the Coast Guard exactly when you left the dock.
Pilots
Night logging · FAA 14 CFR 61.57
FAA night currency is defined relative to civil twilight. ProveMeHere generates a timestamped record of your location at block-out and block-in — solar context included.
Photographers
Blue hour · Civil twilight window
Document the exact solar conditions of your capture — civil twilight begin, sun elevation, offset from horizon crossing. Metadata no standard camera EXIF can provide.
Court-Ordered Compliance
Probation · Parole · Drug court
When you have to prove you showed up — a check-in, a class, a test — a paper sign-in is only as good as someone's word. A stamp is tamper-evident, sealed to the second and the spot, and verifiable by anyone.
Co-Parents
Custody exchanges · Family court
Prove you were on time for the exchange — or that the other party was a no-show. A neutral, time-stamped record for high-conflict handoffs that doesn't depend on either parent's word.
Delivery & Couriers
Proof of delivery · Attempts
Sealed proof of where and when a package was delivered, attempted, or left — beyond a GPS ping the recipient can dispute, and independent of the carrier's own system.
Caregivers & Home Health
Visit verification · EVV / Medicaid
Electronic Visit Verification is federally mandated for Medicaid home care. Clock in and out at the client's door with a hardware-rooted, location-sealed record — not an entry the agency can edit later.
Security & Patrol
Guard tours · Checkpoints
Prove every checkpoint on a patrol was actually walked — on foot or by car — with a sealed time and place. A guard-tour record a client can verify, and that an incident report can't be backfilled around.
Field & Inspection
Site visits · Inspections
Inspectors, surveyors, adjusters, and meter readers: prove you were physically on site at the time of the visit — sealed coordinates and timestamp, not a form filled in afterward.
Pricing — Try free, subscribe when ready
Free Trial
5 Stamps
$0
5 stamps within your first 60 days from first use. Civil twilight display always free, forever.
Basic · On-Device Signed
25 stamps/mo
$3.99 / mo
On-device ECDSA signed stamps. $39/yr annual option. Device-signed QR verifiable by any warden.
Basic · On-Device Signed
100 stamps/mo
$9.99 / mo
Higher volume. $99/yr annual option. Same on-device signing — more stamps per month.
Pro · CA Certified
25 stamps/mo
$9.99 / mo
RFC 3161 CA-signed + on-device signed. Court-admissible. $99/yr annual option.
Pro · CA Certified
100 stamps/mo
$29.99 / mo
Higher volume Pro. $299/yr annual. Full trust chain on every stamp.
Ad-Hoc + Pay Later
Single stamps
$4.99+
$4.99 Basic · $19.99 Pro upfront. Or upgrade any past Basic stamp to Pro for $24.99.
Full pricing details on ProveMeHere →
PresenceVault · Trust Infrastructure
Zero knowledge of your whereabouts
PresenceVault handles the cryptographic infrastructure that makes Pro-tier certificates legally admissible — without ever seeing your location, your identity, or your payload.
The RFC 3161 timestamp authority receives only a cryptographic hash — a fingerprint of your data that proves it existed at a moment in time, without revealing what the data contains.
Your payload lives in your own private iCloud container. JSC Biz LLC has no access to it. Not today, not ever.
Apple Secure Enclave ×2 — Watch + iPhone. Keys generated on-chip, never exported, never transmitted.
Apple App Attest ×2 — Apple certifies genuine hardware, genuine app binary. Jailbreaks and simulators excluded.
Dual ECDSA P-256 — Both devices sign independently. Any tampering breaks both signatures.
RFC 3161 Timestamp — Trusted CA co-signs a hash of the payload. Same standard as DocuSign and Adobe Sign.
Civil Twilight Context — Precise solar position at the moment of tap. Computed on-device from NOAA algorithms.