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How to Timestamp a Document and Prove It Existed Before a Certain Date

Learn how to create cryptographic proof a document existed at a specific moment — without relying on metadata or third parties.

How to Timestamp a PDF for Legal Proof

Need to prove a PDF existed at a specific moment? Learn how to create a verifiable, legally defensible timestamp without storing the file.

What Is Proof of Existence for a Document?

Proof of existence creates a verifiable record that a document existed at a specific moment — without revealing its contents.

How to Protect Your Intellectual Property Before Sharing It

Before you share a design, code, or creative work, protect yourself with a cryptographic timestamp. Takes under two minutes.

How to Prove You Sent a File on a Specific Date

Email receipts can be faked and cloud timestamps disputed. Here's how to create an irrefutable record proving you sent a specific file at a specific moment.

What Is SHA-256 and How Does It Prove File Integrity?

SHA-256 creates a unique fingerprint of any file. Learn how it works and why it's the gold standard for proving a document hasn't been tampered with.

How to Timestamp a Document Online for Free

Timestamp any document in seconds — no account, no file upload. Create a cryptographic proof that your document existed at a specific date and time.

How to Prove a Document's Date Without Trusting Anyone

File metadata can be changed, email timestamps spoofed. Learn how to create proof that holds up — without relying on any third party.

SHA-256 File Verification: How to Check If a File Has Been Tampered With

If even a single byte changes, the SHA-256 hash changes completely. Learn how to use file verification to detect tampering instantly.