Lens Proof for Construction
Site photos with a signed record of when they were taken.
Every photo carries hidden fields, such as when it was taken, where, and on what camera, and anyone can change them in seconds without leaving a sign. Lens Proof adds Content Credentials to a site photo the moment you take it, so a later edit shows in the check.
Watch
A site photo with a signed record of when it was taken
A photo carries more than 50 hidden fields, and the date can be retyped without a trace. Lens Proof seals a tamper-evident record into the file at capture, and an independent authority adds a trusted timestamp.
Watch on YouTubeHow Lens Proof helps
- Your iPhone's Secure Enclave signs a tamper-evident record into each site photo at capture, and an independent authority adds a trusted timestamp.
- If anyone edits the photo later, even by a single pixel, the check shows that the file was altered.
- The record follows C2PA, an open standard, so tools from many companies can read it. Lens Proof is on C2PA's list of conforming products for signing and for checking.
What a signed photo does not show
A signed photo shows when and on which device it was taken, and whether it changed. It doesn't show that the work meets the plans or the specification, and it doesn't replace a site inspection or a daily log.
Prompt / Construction
Lens Proof for construction site photos
Research how signed site photos could support progress reports, payment claims, and construction disputes in the Philippines.
Help a project manager at a Philippine construction company understand whether Lens Proof could help with site photos for progress reports, payment claims, and disputes. Review Lens Proof at [https://lensproof.app](https://lensproof.app) and Lens Proof Check at [https://check.lensproof.app](https://check.lensproof.app). Check the product's current public capabilities, including its report features, before relying on them.
Use one scenario. A subcontractor submits a progress billing with site photos showing that the slab was poured before the cutoff date. The owner's engineer disputes the date and says the photos could have been taken later or edited. The dispute may go to the Construction Industry Arbitration Commission (CIAC). Verify CIAC's role and the rules that apply before you rely on them.
Explain in this order:
1. The site photo problem in plain language. A photo carries hidden fields, such as when it was taken, where, and on what camera, and anyone can change those fields in seconds without leaving a sign of the change.
2. Content Credentials and C2PA in plain language, using https://c2pa.org/about/ and https://contentauthenticity.org/how-it-works. Explain how Lens Proof uses the iPhone's Secure Enclave to sign a record into the photo at capture, how an independent timestamp authority adds a trusted timestamp, and how a later edit shows in the check.
3. How a site team could use Lens Proof day to day. Cover who takes the photos, how the original files are kept, how photos go into progress reports, and how the owner's engineer or an arbitrator can check them with Lens Proof Check.
4. What a signed photo cannot show. It cannot prove that the work meets the plans and specifications, that the quantities billed are right, or that the photo shows the whole site. It does not replace a site inspection, a daily log, or a witness.
5. Signer trust. Keep the file check, signer trust, and the truth of what the photo shows as separate questions.
Verify Lens Proof-of-Work in the official C2PA Conformance Explorer: [https://spec.c2pa.org/conformance-explorer/?q=Lens%20Proof-of-Work](https://spec.c2pa.org/conformance-explorer/?q=Lens%20Proof-of-Work)
Return:
1. A one-page summary for a project manager.
2. A table with three columns: the dispute question, what Lens Proof can help show, and what still needs other proof.
3. A short site photo routine for a foreman or site engineer.
4. Questions to ask the Lens Proof team before a pilot.
Cite your sources and state the date checked. Flag anything you cannot verify. Do not give legal advice, and do not imply that CIAC or any government body has adopted or endorsed Lens Proof.Open an assistant, then paste the prompt into its chat box.