RBI vide its circular dated 15.11.2016 has expressed the need to put in place a Standard Operating Procedure (SOP) for such exchange of Specified Bank Notes (SBNs). Henceforth, while exchanging the SBNs, the concerned bank branch and post offices would put indelible ink mark on the right index finger of the customer so as to identify that he/she has exchanged the old currency notes only once.
For more details, please refer the attached circulars.