BENGALURU (Reuters) -There are some disagreements over restructuring debt for distressed economies, the chief of the International Monetary Fund said on Saturday on the sidelines of a G20 meeting, adding that banning private cryptocurrencies should be an option. India's G20 presidency comes at a time when its South Asian neighbours Sri Lanka, Bangladesh and Pakistan are seeking urgent IMF funds due to an economic slowdown caused by the COVID-19 pandemic and the Russia-Ukraine war. China, the world's largest bilateral creditor, urged G20 nations on Friday to conduct a fair, objective and in-depth analysis of the causes of global debt issues as clamour grows for lenders to take a large haircut, or accept losses, on loans.