A sign indicating digital yuan, also referred to as e-CNY, is pictured at a shopping mall in Shanghai, China April 21, 2021. REUTERS/Aly Song/File Photo Purchase Licensing Rights, opens new tabLONDON, Jan 16 (Reuters) - Transactions on a new China-led digital currency platform have surged to over $55 billion, a new report shows, the latest sign that efforts to build alternatives to dollar-dependent global payment systems are ​gaining traction.Data crunched by the Washington-based Atlantic Counci...