A (non-specialist) idea of architecture : - If you are more than X minutes at less than 2 meters of someone, you get a unique address from this person (like fo

A (non-specialist) idea of architecture : - If you are more than X minutes at less than 2 meters of someone, you get a unique address from this person (like for any blockchain transaction), stored in your smartphone. - If your are infected (after validation by a doctor?), you just send the info (like a normal transaction) to all the relevant "unique addresses" stored in your phone - Using existing blockchain (and a modified version of their open source wallet) to do these simple transaction, with existing coin (eg. using OP-RETURN) or by creating a specific token. Monero would be interesting (obscures sender and recipient) for the privacy side. Less private, but I like Komodo too... Nothing stored in the blockchain. No smart contract, no gas cost, nothing complex, using existing tech and open source code...