I do not think digital currencies can not replace paper money, the future of paper money will remain safe and will not be threatened because paper money is very easy to use in the transaction process by any circle, flexible and paper money can be used anywhere. and whenever we do not need to find a special outlet to use it. so until whenever the paper money will not be replaced. But there is still the possibility of paper money can be replaced with digital currency if all circles of society have been using increasingly sophisticated technology