Learn
Understand the proof before you need it.
Plain-language guides to fingerprints, timestamps, file integrity and practical digital proof.
Start here
Two ideas explain most of ProofStamp.
Start with the fingerprint itself, then see how it becomes useful as evidence over time.
Basics
What is a hash function? SHA-256 explained
Understand the digital fingerprint behind file verification and why changing even one byte produces a different result.
Practical guide
How to prove a photo or document existed before a specific date
See the workflow from creating a local fingerprint to preserving evidence that can be checked later.
All guides
Go deeper.
Practical examples and explanations of what verifiable evidence can show, where it helps, and where its limits are.
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They Told Me They Would Refund Me
Read guide →: They Told Me They Would Refund MeThey told me they would refund me. Suppose you’ve already made the call. You explained the charge, waited while someone checked your account, and got an answer: the money would be returned.…
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When Neither Side Should Control the Record
Read guide →: When Neither Side Should Control the RecordMost digital records do not need anything special. An email confirmation is usually enough. So is a shared folder, a company database, or a PDF saved by both sides. The interesting cases…
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Which ProofStamp Should You Use?
Read guide →: Which ProofStamp Should You Use?ProofStamp can preserve the fingerprint of a file in several different ways. The basic idea stays the same: Your file → SHA-256 fingerprint → evidence Your original file stays with you. What…
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How to Keep Verifiable Evidence of an AI Conversation
Read guide →: How to Keep Verifiable Evidence of an AI ConversationAI is becoming part of ordinary professional work. People use ChatGPT, Claude and other AI tools to research questions, analyze documents, investigate problems and prepare advice. Sometimes the conversation itself matters. If…
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Your Logs Are Fine. The Process Around Them Is Changing.
Read guide →: Your Logs Are Fine. The Process Around Them Is Changing.Why AI-assisted infrastructure work may need durable, independently verifiable traces An infrastructure professional recently told me: “In infrastructure we don’t really have a task to prove timestamps on pieces of information. Everyone…
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Before You Leave the Job, ProofStamp the Photo
Read guide →: Before You Leave the Job, ProofStamp the PhotoA 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…
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How to Prove a Photo or Document Existed Before a Specific Date
Read guide →: How to Prove a Photo or Document Existed Before a Specific DateProofStamp 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…
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Adding Verifiable Proof to Semiconductor Assurance
Read guide →: Adding Verifiable Proof to Semiconductor AssuranceTwo 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…
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AI in Legal Work: What to Record and What a ProofStamp Can Prove
Read guide →: AI in Legal Work: What to Record and What a ProofStamp Can ProveAI is becoming part of ordinary legal work. A lawyer may use it to research a question, summarize documents, test an argument, organize information, or prepare a first draft. Most AI conversations…
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What Is a Hash Function? SHA-256 Explained.
Read guide →: 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…
Ready to make a record verifiable?
Choose the ProofStamp method that fits what you want to preserve.