Abstract: Open and secure electronic signature system comprising a business application (10), said business application having a programming interface (42) configured to request a signature of a document (20) with a signature manager (40) for a user (30), the system is characterized in that said business application (10) is able to define a content to be signed, to identify criteria and to select a signatory user (30), to define the use of a type of digital identity, to collect signature properties, and to require a signature format. The signature manager (40) is able to coordinate said signature request by performing the following steps: —verification of the identity and the authorization of the business application (10), —verification of the identity of the user signatory (30), —recovery of the document (20) to be signed, —preparation of the signature request with fingerprint calculations of the data to be signed, —sending a notification of the signature request to signature services (60) of the user (30).