In this early draft, we provide an overview on similarities and differences in the implementation of a paper card-based vaccine credential system and an app-based vaccine credential system. A vaccine credential's primary goal is to regulate entry and ensure safety of individuals within densely packed public locations and workspaces. This is critical for containing the rapid spread of Covid-19 in densely packed public locations since a single individual can infect a large majority of people in a crowd. A vaccine credential can also provide information such as an individual's Covid-19 vaccination history and adverse symptom reaction history to judge their potential impact on the overall health of individuals within densely packed public locations and workspaces. After completing the comparisons, we believe a card-based implementation will benefit regions with less socioeconomic mobility, limited resources, and stagnant administrations. An app-based implementation on the other hand will benefit regions with equitable internet access and lower technological divide. We also believe an interoperable system of both credential systems will work best for regions with enormous working-class populations and dense housing clusters.

翻译：在这份早期草案中,我们概述了基于纸牌的疫苗证书制度和基于证据的疫苗证书制度实施过程中的异同之处。疫苗证书制度的主要目标是管理在拥挤的公共场所和工作空间内入境和确保个人安全。这对于遏制Covid-19在拥挤的公共场所的迅速蔓延至关重要,因为一个人可以感染人群中的绝大多数人。疫苗证书制度还可以提供个人Covid-19接种史和不良症状反应史等信息,以判断其对人口稠密的公共地点和工作空间内个人整体健康的潜在影响。在完成比较之后,我们认为,基于卡的执行将有利于社会经济流动性较低、资源有限和行政管理停滞的地区。另一方面,基于程序的执行将有利于互联网接入公平、技术差距较小的地区。我们还认为,两种证书制度的互操作系统对工作阶层人口众多和住房密集的地区最有效。