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Is this document ours?

Drop the sealed PDF here, or paste the checksum from its certificate. We answer from the checksum alone — which is why the answer outlives the 90 days.

The document (PDF)

Choose a fileor drop it here

The file never leaves your machine: your browser computes the checksum and sends only that.

Or its SHA-256

The 64-character checksum printed on the certificate page.

We keep the checksums of every document we seal, also after the document itself is deleted, so this answer outlives the file.