A blockchain is a decentralized database. It is distributed on a network of thousands of servers.
A new entry has to be verified by the majority of them. After this, all servers of the network update their version of the database. When one block is complete, the next one is generated. Due to the chronological storage of data in the individual blocks of the chain, these cannot be changed subsequently without damaging the entire system. The data on the blockchain is encrypted and manipulation is largely restricted. You can see that a transaction took place, but no private information is published. The blockchain is accessible to everyone worldwide. It became well-known as the technology behind the digital currency Bitcoin.
We look at some of the lesser-known realities of migration. Including Haitians being sent home from Chile — if they promise not to return for nine years — the surprising role of blockchain in a refugee camp in Jordan and the dark side of working in Italy's produce fields. Plus, just how well have migrants in Germany integrated?
The Zataari camp in northern Jordan currently houses almost 80,000 Syrian refugees. In many ways it has become a permanent settlement. But residents now have the option to shop using a cashless blockchain payment system — instead of handing over cash, a machine scans their iris to check their identity. The refugees are welcoming the system – especially because it’s hard to cheat.