After a transaction has been completed, you have the option to download an 'evidence summary', as an additional burden of proof. This document describes exactly the steps that each signer has gone through from the moment the signing process started. You can download this document by going to the completed transaction and clicking on the second blue button from the left.
Then a PDF file is created that you can save for archiving.
An alternative is to look up the transaction via 'Reports' and from there download the 'evidence summary'. The feature is only available to administrators.