Signatures bound to a specific version
A signature request is raised against one version of one document. When it completes, the signed output is filed as a new version with the request history attached, so the question "what exactly did they sign" has a single answer rather than an inference from timestamps.
This is the failure mode that print-sign-scan produces and that a document management system should eliminate: a signed PDF sitting in an inbox with no verifiable relationship to the draft that was circulated for approval.
