Since the Taliban returned in August, Afghanistan's economy has virtually collapsed and the country is in the grip of a crisis caused by the seizure of billions of dollars of assets held abroad. But digital currencies and their decentralised architecture, impervious to international sanctions, are allowing a handful of young Afghans to avoid the worst of the crisis. A hundred students in Herat are receiving around $200 a month in cryptocurrency since September thanks to an American NGO Code To Inspire. IMAGES AND SOUNDBITES