Proovik
person
Simple Process

How It Works

Prove that your document already existed at a specific date and time. Four steps, without uploading the file.

1

Select your document

Drag or select any file. Your document never leaves your device.

picture_as_pdf PDF description DOCX image JPG/PNG folder_zip ZIP
2

We generate the hash

We calculate the SHA-256 of your file locally. It's like a unique "fingerprint".

SHA256: e3b0c44298fc1c149afbf4c8996fb924...
3

Register on Kaspa

The hash is inscribed in a Kaspa blockchain transaction with timestamp.

bolt Kaspa → ~1 second
4

PDF Certificate

Download your certificate with hash, TX ID, timestamp and verification data.

What does the certificate contain?

fingerprint
SHA-256 hash of the document

SHA-256

tag
Kaspa transaction ID

Kaspa TX ID

schedule
Exact timestamp

UTC Timestamp

account_tree
Merkle Proof for verification

Merkle Tree

Anyone can check it, without asking us

The certificate contains everything needed to repeat the check with standard tools: recompute the document's SHA-256, follow the Merkle path and find the transaction on the public Kaspa network. No account, no API of ours, and no need for Proovik to still exist.

verified How to verify a proof

Ready to certify your first document?

It's free, instant and requires no registration.

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