Notarize any document in blockchain for free

Your documents will NOT leave your computer. Only the hash of the file will be calculated in YOUR browser and then sent to us.

The file will NOT be uploaded to our server.

List of your uploads

Nothing here

Proofs can be independently checked via


The service enables you to prove that you were the originator of an information at a certain time. It uses BlockReceipt protocol to anchor data in the blockchain. Notarized files are impossible to be recovered via brute force attacks even if the attacking party has receipts for them. In addition, BlockReceipt is blockchain friendly protocol, so many files can be notirized by one transaction.

Alternatives: EternityWall, ProofOfExistence, OriginStamp

For api requests please contact me via mail