Solutions should allow Member States’ servers to communicate and receive relevant keys between themselves using a trusted and secure mechanism.

Roaming users should upload their relevant proximity encounter information to the home country backend. The other Member State(s) should be informed about possible infected or exposed users*.

*For roaming users, the question of to which servers the relevant proximity contacts details should be sent will be further explored during technical discussions. Interoperability questions will also be explored in relation to how a users’ app should behave after confirmed as COVID-19 positive and the possible need for a confirmation of infection free.

Conversely, the 19 academics behind the proposal for interoperability of different decentralized contact-tracing protocols do include a section at the end of

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