Bothhere

Taken by one.
Signed by
everyone there.

Bothhere is a GPS camera for iPhone with Shared Proof. The people standing at the same place co-sign each photo, each on their own iPhone. Anyone can check it later. No photo is ever uploaded.

Try it: check a photo Coming soon to the App Store
Said's iPhone Took it 14:02:10 Karim's iPhone Agreed 14:02:31 Photo 3 Same place ±6 m apart

Not one more stamp camera.

A stamp on a photo is one person's word. Bothhere adds the other people who were standing there, and records what each of them said about every photo.

A stamp camera Bothhere
Who signs The one phone that took the photo. Each person present, on their own iPhone.
The other side Sees the photos later, if at all. Marks "agree" or "disagree" on each photo, on the spot.
What you end with Photos in one camera roll. One sealed report for everyone: PDF plus a verify link.
Checking later You trust what the stamp says. Anyone scans the QR and sees if the photo was changed.

Three steps, a few minutes.

  1. Shoot

    Start a shared record and take the photos. Each one stays a normal JPEG, stamped with the place, the time, a map and a QR code.

  2. Co-sign

    The others scan a QR code on your screen, type their name and mark each photo "agree" or "disagree". Each answer is signed by a key locked in that person's iPhone.

  3. Seal

    Close the record. Everyone gets the same sealed report: a PDF with the photos, the signers and their answers, plus a verify link.

Made for the moment two sides look at the same thing.

  • Seller + buyerCar and property sales
  • Owner + tenantRentals, check-in and check-out
  • Driver + receiverDeliveries and handovers
  • Technician + clientInspections and repairs
  • Policyholder + other partyInsurance documentation

The photo stays. Only its fingerprint travels.

No photo is ever uploaded, not when you shoot and not when someone checks. The server keeps a fingerprint of each photo and the signed details. You share the photos and the PDF yourself.

Each co-sign is made with a key locked in that iPhone's Secure Enclave. Apple App Attest confirms it came from the genuine app.

A co-sign records what the signers stated at that place and time. It is a shared, verifiable record. It is not a legal ruling.

What the server holds for photo 3
fingerprint
9c1f 44b0 … e27a (SHA-256)
place
51.4545, -2.5879 ±6 m
time
10 Nov 2026, 14:02:10
signer 1
Said A. signed
signer 2
Karim B. agrees
signer 3
Lina M. disagrees
keys
each signer's public key
photo
not stored
Open the check page Drop or choose a photo there. It is checked in your browser. Nothing is uploaded.

Don't take our word. Check one.

Scan the QR code on a Bothhere photo, or drop the photo on the check page. You get one of two answers, with the place, the time and the signers.

Authentic, unchanged This photo was edited

Open a demo proof with two signers Check a photo at bothhere.app/check