As you are aware that to secure the certificates/documents attested/certified by practicing Chartered Accountants and for tracing forged/wrong documents prepared by any third person misrepresenting himself as a Chartered Accountant, ICAI had implemented an innovative concept of UDIN i.e. Unique Document Identification Number. 

We wish to inform that for this prestigious project of UDIN, ICAI has engaged Tata Consultancy Services (TCS) who is also automating and will maintain the life cycle of CA Members and Students making them largely online on a digital platform. 

To enable TCS do the huge data migration and data audit which will require around 30 days before the UDIN Platform becomes mandatory, Central Council of ICAI has decided to mandate UDIN w.e.f 1st Feb., 2019 in a phased manner as against the earlier announced date of 1st Jan., 2019 . 

Professional Development Committee

Source: https://icai.org/new_post.html?post_id=15314&c_id=240