Dropbox Sign creates a comprehensive transaction trail between signing parties. To provide you with a transaction history, we track and timestamp various information from the moment the document is submitted for signature to when it is completely signed and secured, such as IP address.
To ensure any tampering of your transaction log is detectable, we process the transactions log with hashing technology. Should you ever need to rely on a transaction log, we are right by your side to assist you.
The audit trail that is appended to all executed signature requests includes an identifier that we can use to lookup the corresponding transaction log in our database. You can so that it comes back to you as its own file instead of being appended to the signed document.
These records include a hash of the PDF document which we can compare to the hash of a questionable PDF document to determine whether or not it has been modified or tampered with.
Note: Self signed documents, documents signed using the "Just Me" signing option, don't include an audit trail since you are the only signer on the document.