Before revision:  As the Coronavirus Pandemic of 2019/2020 unfolds, a COVID-19 'Immunity Passport' has been mooted as a way to enable individuals , especially those in healthcare and other key industries, to return safely back to work at 'the right moment'. Despite a number of ethical, social, legal, and biological dilemmas (e.g. 'COVID-19 antibody testing ' is itself unproven), verifiable test results could well become highly desirable, at least in certain key sectors. But a 'paper certificate' has a number of dilemmas of its own, including weak tamper-proofness and rather arcane and clumsy verifiability. To address many of the underlying issues involved in certification, and as a proof of concept for future pandemics, we have developed a prototype mobile phone app  that facilitates instant verification of tamper-proof test results.
After revision:  As the Coronavirus Pandemic of 2019/2020 unfolds, a COVID-19 'Immunity Passport' has been mooted as a way to enable individuals , especially those in healthcare and other key industries, to return safely back to work or be admitted to current off-limits locations. While the quality of antibody testing and the likelihood of even attaining COVID-19 immunity continue to be researched, we address the issues involved in certification, and as a proof of concept for future pandemics, we have developed a prototype mobile phone app that facilitates instant verification of tamper-proof test results.