![]() Because digital fingerprinting is a one way function. The digital fingerprint is computed client side by the browser, and the original content cannot be recovered from it. Various open source tools exist like and Woleet ProofDesk.Ĭreating a proof of existence or signature for an email or attachment doesn’t modify nor leak the content to the email or attachment. Generated proofs can be verified with no intermediary, not even Woleet (since the Bitcoin blockchain is a public ledger). So signing can be performed using a regular Bitcoin hardware wallet like the Ledger Nano S. Signatures are created using the Bitcoin signature scheme. This link allows to prove that the signature (and the signed data) existed at the time of the transaction. It links the digital fingerprint of the signature of the data to a Bitcoin transaction. It allows to prove that the data existed at the time of the transaction.Ī proof of signature is similar: it is proposed by Woleet as an improvement of the Chainpoint format. This proof links the digital fingerprint of the data to a Bitcoin transaction. Verify when and who signed an email or attachment (number of signatures is not limited)Ī proof of existence is a self contained cryptographic proof (available as a JSON file compliant with the Chainpoint format).Sign an email or attachment using a highly secured Ledger Nano S hardware Bitcoin wallet.Verify the timestamps of an email or attachment (whoever timestamped it). ![]() Sign and prove email more easily than ever. By Communication Team Woleet has released an Outlook add-in allowing to create and verify proofs of existence and proofs of signature for emails and attachments.
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