https://techcrunch.com/2020/04/27/germany-ditches-centralized-approach-to-app-for-covid-19-contacts-tracing/

Germany has U-turned on building a centralized COVID-19 contacts tracing app — and will instead adopt a decentralized architecture, Reuters reported Sunday, citing a joint statement by chancellery minister Helge Braun and health minister Jens Spahn.

In Europe in recent weeks, a battle has raged between different groups backing centralized vs decentralized infrastructure for apps being fast-tracked by governments which will use Bluetooth-based smartphone proximity as a proxy for infection risk — in the hopes of supporting the public health response to the coronavirus by automating some contacts tracing.