Privacy preserving electronic document signature service

A system of providing a secure electronic document signature service comprising:

• at least one processor;
• and
• at least one non-transitory computer readable storage medium storing instructions thereon that, when executed by the at least one processor, cause the system to:
• receive by at least one server device and from a client device corresponding to an originating user, a protected electronic document and a user identity of a participant user, wherein the content of the protected electronic document is inaccessible by the at least one server device;
• perform, by the at least one server device, a hash function on the protected electronic document to generate a server-generated ID element;
• provide the server-generated ID element to the originating user for verification that the server-generated ID element matches a client-generated ID element generated at the client device;
• provide the protected electronic document to a client device corresponding to the participant user;
• receive an electronic signature from the participant user;
• and
• generate an event log associated with the protected electronic document, the event log comprising information associated with the received electronic signature.

A method of providing a secure electronic document signature service, comprising:

• receiving, by at least one server device, a protected electronic document from a client device corresponding to an originating user, wherein the contents of the protected electronic document are inaccessible by the at least one server device;
• determining, by the at least one server device, a server-generated ID element for the protected electronic document;
• providing, to the client device, a verification request that includes the server-generated ID element;
• receiving, from the client device, a verification response indicating that the server-generated ID element matches a client-generated ID element generated by the client device for the protected electronic document;
• and
• recording the verification response in an event log associated with the protected electronic document.