Zilient - Reuteur (21.07.2017) Thousands of Syrian refugees in Jordan's Azraq camp don't pay for their food with cash but by a scan of their eyes. Purchases are then recorded on a computing platform based on blockchain - the technology behind bitcoin. The U.N. agency launched the futuristic system in May as a one-month pilot involving 10,000 of Azraq's more than 50,000 inhabitants in a bid to explore blockchain's potential to cut costs and bottlenecks.