RT @carmelatroncoso@twitter.com

Open letter: open, transparent and private-by-design COVID-19 contact tracing systems are needed. Centralization must be avoided to limit surveillance and repurposing. Signatories: 300+ scientists from 25+ countries

https://drive.google.com/open?id=1OQg2dxPu-x-RZzETlpV3lFa259Nrpk1J

🐦🔗: https://twitter.com/carmelatroncoso/status/1252206438988087298