Guide
Protect PDFs, timestamp files or text, and check hashes
Start with what you want to do. The Guide connects every HashMyWords workflow and explains the hash, timestamp and evidence underneath it.
What do you want to do?
Choose the task that matches what you are trying to protect, timestamp or check. You can move into the deeper technical guides afterwards.
Harden and timestamp a reference copy before uploading it to ChatGPT, Claude, Gemini, Copilot, Perplexity or another AI tool.
Read the workflow → TimestampTimestamp a fileLearn how file hashing and timestamping work, what stays on your device, what SHA-256 is public, and how to check the exact file later.
Read the file guide → TimestampTimestamp textUnderstand Public and Private text timestamping, then create a hash of the exact words and record it on Hedera.
Read the text guide → CheckCheck a file or secret codeLearn how Check a secret code and Check a file work before checking a saved HashMyWords record.
Read the checking guide →Understand what the hash and timestamp mean
These articles explain the cryptography and evidence model without requiring blockchain expertise.
What a cryptographic timestamp can demonstrate — and what it cannot.
Read article → HashingCalculate a SHA-256 hashHow digital fingerprints work, why exact bytes matter, and where to generate a hash.
Read article → HederaHedera timestampingHow HashMyWords records SHA-256 hashes on an independently verifiable Hedera timeline.
Read article → EvidencePreserve a stronger evidence trailCombine the timestamp with the original material, receipts and surrounding context.
Read article →Need a quick answer?
The FAQ covers common product, privacy and checking questions. For an issue with a specific hash, record or account, use Contact.