Legal evidence is key when it comes to electronic signatures. You need to have evidence that can't expire or be cancelled, and that requires a method of verification that's independent of the e-signature vendor. If you depend on a vendor, then your e-signature is valid only as long as the vendor is in business — or as long as you keep paying.
Every SIGNiX electronic signature is completely independent. You can prove that it is valid without contacting SIGNiX or even having an Internet connection.