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Don't take our word for it. Verify it yourself.

For an evidence product, trust isn't claimed — it's verified. We notarized a public witness document on the Arweave blockchain. Here is its proof, and how to check it end to end, without us.

Public witness proof

Here are the three reference values of our witness document. Run the audit in the app and compare what you get with these values: if everything matches, the file has not been modified and its author is authenticated.

Blockchain TXID
eBmnQm4r0k-I9X…FO-9WF3Dlo
Expected SHA-256 fingerprint
8a78d3ba78386f…a9a79af352
Expected Dilithium-5 public key
pub_dili5_b412…05ee6c3c90
View the encrypted data on the blockchain

How to verify it yourself, in 4 steps

  1. 1

    Download the app

    Install BlockProve on the device of your choice — mobile (iOS / Android) or computer (macOS / Windows) — and open the “Universal Verifier”. No account is needed to verify.

  2. 2

    Enter the TXID

    Paste the TXID above into the field provided. Optionally, you can also enter the expected SHA-256 fingerprint and public key provided here, for an automatic comparison.

  3. 3

    Run the audit and compare

    The app downloads the archive from the blockchain, recomputes the SHA-256 fingerprint and validates the post-quantum Dilithium-5 signature. Compare the fingerprint and public key you obtain with those provided above: if they match, the file is intact (unmodified) and its author is authenticated.

  4. 4

    Decrypt and retrieve the file

    The archive is AES-256-GCM encrypted. With the password (held by the author or an authorized recipient), decrypt the archive directly in the app and save the original file to your device. Without the password, the proof remains verifiable, but the content stays confidential.

    Decryption password (public witness) provided on request at contact@blockprove.me

Why this is the ultimate proof

Even this public document was encrypted locally before any upload. Its integrity and date can be verified without ever accessing the content: that's the principle of zero-access encryption. For your own deposits, no one — not even BlockProve — can decrypt your files without your password.

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