Field-work proof
How to prove a vendor showed up to a property
Last updated July 9, 2026
How do you prove a vendor showed up to a property?
Send the vendor a text link at the scheduled time. The link opens a live camera (no gallery uploads) and attaches GPS and a server timestamp the moment the photo is taken. Each visit lands on your dashboard as a time-stamped, location-checked record you can search by site or date.
Why isn't a group-chat photo enough proof?
A photo texted into a group chat can be an old picture from the camera roll, taken anywhere, on any day. There is no trusted capture time, no location, and no way to show it was not reused or edited. In a dispute, "a photo we have somewhere" is not a dated, GPS-stamped record.
Can a vendor fake a live photo or the GPS?
The link opens the camera directly and blocks gallery uploads, so a worker cannot attach an older shot. Reminder timing is randomized, so nobody can pre-stage a photo for a predictable minute. GPS and a server timestamp are attached at capture, and each submission is sealed with a SHA-256 fingerprint so later changes are detectable.
What makes a visit record hold up when a client disputes it?
Four things travel with every visit: the live photo, GPS coordinates, a server timestamp the worker cannot set, and a chain of custody showing the record has not been altered since capture. When a client asks months later, you pull the exact visit and share a tamper-evident link instead of searching old chats.
How is this different from a GPS check-in app?
A GPS check-in proves a phone was near a location, not that the work happened. LockProof pairs location with a live photo of the actual task and a sealed timestamp, so you see what was done, where, and when. Workers need no app and no login: they tap the text link and shoot.
Group chat vs. GPS check-in vs. LockProof
Most property managers already collect something. The question is whether it survives a dispute. Here is what each approach actually gives you.
| What you get | Group chat / paper log | GPS check-in app | LockProof |
|---|---|---|---|
| Proof the work happened | A photo, maybe | Location only | Live photo of the task |
| Capture time you can trust | No | Sometimes | Server timestamp |
| Location on the record | No | Yes | GPS at capture |
| Tamper-evident record | No | No | SHA-256 chain of custody |
| Worker app required | No | Usually | No — just a link |
| Findable months later | No | Rarely | Searchable Evidence Vault |
Want to see what one finished record looks like? Open a sample verified record — the photo, GPS, timestamp, and event history in one packet.