# ProofStamp

> Proof, Stamp. Trust.


## Posts

- [Before You Leave the Job, ProofStamp the Photo](https://proofstamp.org/before-you-leave-the-job-proofstamp-the-photo/): A contractor once described a simple dispute. He removed a concrete slab. The next morning, a neighbour claimed the work had caused a crack in another slab. Fortunately, the contractor had a photo taken before the job started. The crack was already visible. That photo changed the conversation. The lesson is simple: keep evidence before it becomes important. Take photos before and after the job If you are a contractor, installer, cleaner, mover, mechanic, landscaper, or anyone working on someone else’s property, take a few photos before you start. Then take photos again when the job is finished. A simple routine: […]
- [How to Prove a Photo or Document Existed Before a Specific Date](https://proofstamp.org/how-to-prove-a-photo-or-document-existed-before-a-specific-date/): ProofStamp Email Receipt lets you create a SHA-256 fingerprint of a photo or document in your browser and send it to yourself by email without uploading the original file. It provides a simple way to verify later that a file is unchanged, making it useful for property photos, signed documents, and other important records.
- [Adding Verifiable Proof to Semiconductor Assurance](https://proofstamp.org/adding-verifiable-proof-to-semiconductor-assurance/): Two chip-release manifests carry the same product number. Both look authentic. One was approved before manufacturing. The other appeared later. Which one should a buyer trust? Contracts, certificates, portal records and PDFs can describe what a manufacturer approved, tested and delivered. But those records usually remain inside systems the manufacturer controls. If two copies differ during an audit or dispute, the buyer lacks a neutral reference for the version that existed at the relevant time. In one sentence ProofStamp creates a public, time-bound commitment to the hash of selected evidence, while the evidence itself stays private. Private file. Public proof. At […]
- [AI in Legal Work: What to Record and What a Hash Can Prove](https://proofstamp.org/ai-in-legal-work-what-to-record-and-what-a-hash-can-prove/): If AI-assisted legal work is challenged, the useful question is not simply whether AI was used. It is what the tool did, what information it received, what a lawyer checked, and which exact file was approved. A hash and timestamp can help identify that file and show when its cryptographic fingerprint was recorded. They cannot prove that the work was correct. That limit is what makes proof stamping useful rather than promotional. Why legal AI needs a review record Lawyers now use generative AI to summarize documents, organize issues, test arguments, and draft early versions. Courts are not treating every use […]
- [What Is a Hash Function? SHA-256 Explained.](https://proofstamp.org/what-is-a-hash-function-sha-256-explained/): Learn what a hash function is and how SHA-256 turns any file, message, photo, or video into a fixed-length digital fingerprint. This guide explains how hashes verify data integrity, why SHA-256 is widely used, where hashes appear in everyday tech, and what a matching hash can and cannot prove.
- [Trust Is the Invisible Infrastructure of Civilization](https://proofstamp.org/trust-is-the-invisible-infrastructure-of-civilization/): Trust begins where certainty ends. We trust that the person we are speaking with is who they claim to be. We trust that a document has not been quietly altered. We trust that a photograph represents something that happened. We trust that a company will deliver, a bank will protect our money, and an institution will keep an accurate record. Without trust, even simple cooperation becomes slow and expensive. Every agreement would require an investigation. Every purchase would require an audit. Every message would need independent confirmation. Trust allows people to act before they possess complete information. That is why trust […]

## Pages

- [Learn](https://proofstamp.org/learn/)
- [Contact Us](https://proofstamp.org/contact-us/): We make digital claims easier to verify. ProofStamp.org is a movement for practical, privacy-first proofs. We help people and businesses prove when digital information existed and that it has not changed – without exposing the original file. Private data. Public proof. Independent verification. Contact Us
- [Digital proofs, Simplified.](https://proofstamp.org/): Private file. Verifiable proof. Stamp privately.Prove publicly when needed. Create a SHA-256 fingerprint on your device. Keep it in a dated email for everyday evidence, or anchor it with nStamp when you need a public, independently checkable timestamp. ⌑ Hashing happens locally ○ No account for email proof ✓ Verification is repeatable ▤ Your file Fingerprinted on your device ◎SHA-256 ✉ Email receipt Dated supporting evidence ◇ Blockchain anchor Public timestamp Choose your record Two simple ways to keep your proof. ✉ Email ProofStamp Everyday evidence Get an email receipt → ◎ nStamp Stronger public timestamp Anchor on-chain → How it […]

## Optional

- [Agent (MCP protocol)](websites-agents.hostinger.com/proofstamp.org/mcp)

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