GSign is a free digital signature application for Android devices developed by the General Authority for State Registration. It aims to provide Mongolian citizens with an easy and secure way to obtain and use digital signature certificates to sign and verify signatures for online services.

The app is designed to comply with the "Law on Digital Signatures" of Mongolia, which states that only citizens of Mongolia who are 16 years of age or older can use it. With GSign, users can obtain their digital signature certificates without any charge and use them to sign documents, contracts, and other online transactions.

Overall, GSign is a useful tool for Mongolian citizens who need to sign and verify signatures for online services. It is easy to use and provides a secure way to conduct online transactions with confidence.