# google/exposure-notifications-server

Exposure Notification Reference Server | Covid-19 Exposure Notifications

Repository: https://github.com/google/exposure-notifications-server
Canonical: https://ross.abutalabs.com/products/exposure-notifications-server
Homepage: https://www.google.com/covid19/exposurenotifications/
Language: Go
License: Apache-2.0
License Family: permissive
Topics: covid, exposure-notifications
Archived: true
Last push: 2023-06-29T15:31:55+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2317, "days_push": 1161, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2587, forks 313 (observed 2026-08-28T04:07:02.744688+00:00)

## What it is
Google's open-source reference implementation of the COVID-19 Exposure Notifications key server, written in Go. It accepts, validates, stores, and distributes temporary exposure keys to mobile devices for privacy-preserving contact tracing. The project was archived on July 1, 2023.

## Use cases
- deploy an exposure notification key server for a public health authority
- implement the COVID-19 exposure notifications API
- store and distribute temporary exposure keys to mobile devices
- digitally sign exposure key export files
- study a privacy-preserving contact tracing server implementation

## When to choose
- you are a health authority needing a reference implementation of the Exposure Notifications API
- you want to study how exposure key validation, storage, and distribution work
- you need a self-hostable key server deployable on any cloud or infrastructure

## When to avoid
- you need an actively maintained project - it was archived in July 2023
- you are not building an exposure notification system
- you need a general-purpose key server unrelated to contact tracing

## Facets
- artifact type: service
- maturity: abandoned
- function: http-server, api-framework, cryptography, security, database
- domain: healthcare, privacy, backend, apis
- platform: go, cloud, self-hosted
- tags: covid-19, exposure-notifications, contact-tracing, key-server, google, archived, docker, linux

## Member repositories
- google/exposure-notifications-server (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:02.744688+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:22:25.058471+00:00, confidence not recorded.
  - readme: https://github.com/google/exposure-notifications-server (fetched 2026-08-28T04:07:02.744688+00:00, sha 5915542a596f)
- Data as of 2026-08-30T08:39:29.467469+00:00.