56 coders. 48 hours. A bunch of sleeping bags. And one challenge. This is the formula of the EIB Blockchain Challenge, an innovative event that the European Investment Bank hosted on 13-15 June 2018. At the event, the first of this kind ever organised at the EIB, coders from all over the world competed for two days (and two nights!) to find a blockchain solution to revolutionise financial transactions processing.