Immutable Document Signatures on the Blockchain
Instantly connect HelloSign with the Casper Blockchain to ensure the integrity of your documents and make them publicly verifiable.
How it works
Document secrecy
We use the SHA 256 algorithm to compute a hash of your files. This is done in your browser so the contents of your files remain confidential.
No chance of tampering
We store the SHA 256 hash of your email, the SHA 256 hash of your file and a timestamp on the Casper Blockchain.
Verification Tool
Upload a signed document and easily verify its authenticity. We’ll detect if the document has been modified after it was signed.