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This paper describes techniques to help with COVID-19 automated contacttracing, and with the restoration efforts. We describe a decentralized protocolfor ``proof-of-contact'' in zero knowledge where a person can publish a shortcryptographic proof attesting to the fact that they have been infected and thatthey have come in contact with a set of people without revealing anyinformation about any of the people involved. More importantly, we describe howto compose these proofs to support broader functionality such as proofs of$n$th-order exposure which can further speed up automated contact tracing. Thecryptographic proofs are publicly verifiable, and places the burden on theperson proving contact and not on third parties or healthcare providersrendering the system more decentralized, and accordingly more scalable.

SNARKs to the rescue: proof-of-contact in zero knowledge