OB3 Proof
Proof of Existence

Verify a Proof

Enter an OB3-PRF code to verify a document's existence timestamp and integrity

Verification is always free. No account required.

What verification confirms
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Document existed at a specific time
The blockchain timestamp proves when the hash was anchored
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File has not been altered
Drop your original file to confirm its hash matches the anchored record
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Author attribution
Confirms who created and registered the proof
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Permanent and immutable
Record lives on Polygon mainnet forever

Need to create a proof?

Anchor any document on blockchain from $4.95. File stays private -- only the hash is recorded.

Create a Proof -- from $4.95

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