AIM CODEX

Verify a document

Drag the PDF you received here. We check its fingerprint against the seal anchored in Bitcoin — and tell you whether it’s authentic or has been modified.

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Drag the PDF here or tap to choose it

A photo of the document also works on mobile

or paste the seal

Have the document’s seal (code)? Paste it:

Got an .ots proof? Upload it, whoever made it:

Works for any OpenTimestamps proof, not just ours. We tell you what fingerprint it anchors and in which Bitcoin block.

Have an approval receipt (JSON)? Paste or drop it:

🔒Your file never leaves your device. The fingerprint is computed here, in your browser; only that code travels to the server, never the document.

Verification with no account and trusting no one · what is CODEX