Choose the Writing Provenance PDF the writer sent you. Your browser checks its dates and recalculates its figures. The PDF stays on your device.
or drop it here
What is a Time Stamp Authority?
A Time Stamp Authority signs a receipt for a digital fingerprint and the time it received it. OpusWriter sends FreeTSA the fingerprint of each recorded version. Its signed receipt gives that version a date from a clock outside the writer’s computer.
Your browser uses FreeTSA’s published certificate to check the signature. It then traces each shared figure or passage back to the fingerprint on the receipt. OpenTimestamps provides a separate date once a proof reaches a confirmed Bitcoin block.