The system mostly relies on the central server staying online. Technically, though, users make payments by copy/pasting webcash to each other, which can still h

The system mostly relies on the central server staying online. Technically, though, users make payments by copy/pasting webcash to each other, which can still happen even if the server is offline. When the server is offline they won't be able to check for double spending and they won't be able to tell the server to refresh any secrets.