[ChrisCinelli]

I suppose there is a need of a trusted 3rd entity that runs the service.

Otherwise anybody could run the service and pretend that anybody else signed any documents they want at any time they wanted.

I am not familiar with DocuSign internal but it looks like people are identified by their email. So only if you can click the link received in their email, it can be them.

I guess a problem with DocuSign is still that anybody can sign up for a new email and pretend to be anybody they want.