CONRAD ONYANGO BIRD, STORY AGENCY GHANA has become the latest African country to begin testing the viability of its central bank-backed digital currency, the eCedi, heating up the race to roll out e-cash on the continent. South Africa and Ghana are now the only African countries at the pilot stage of the process after Nigeria launched the eNaira in October 2021. Ghana is testing an offline version of the eCedi in Sefwi Asafo, a small town in the country's Western North Region, using a contactless smart card. eCedi is a retail Central Bank digital currency that can be used for…