In this article we present hygiea, an end-to-end blockchain-based solution for the Covid-19 pandemic. hygiea has two main objectives. The first is to allow governments to issue Covid-19 related certificates to citizens that can be verified by designated verifiers to ensure safer workplaces. The second is to provide the necessary tools to experts and decision makers to better understand the impact of the pandemic through statistical models built on top of the data collected by the platform. This work covers all steps of the certificate issuance, verification and revocation cycles with well-defined roles for all stakeholders. We also propose a governance model that is implemented via smart contracts ensuring security, transparency and auditability. Finally, we propose techniques for deriving statistical models that can be used by decision makers.

翻译：在本文中,我们介绍Covid-19大流行的基于端到端的链条解决办法Hygia。Hygia有两个主要目标:一是允许政府向公民发放Covid-19相关证书,这些证书可以由指定的核查员核查,以确保工作场所的安全;二是向专家和决策者提供必要的工具,以便通过在平台收集的数据之上建立统计模型,更好地了解该流行病的影响;这项工作涵盖证书发放、核查和撤销周期的所有步骤,并明确界定所有利益攸关方的作用;我们还提出了一个治理模式,通过确保安全、透明和可审计的智能合同加以实施;最后,我们提出了决策者可以使用的生成统计模型的技术。