The digital Covid vaccination certification, or "passport," is a mobile app that instantaneously affirms the vaccinated status, Covid test results, birth date, gender, and/or other identifiers of its holder. The information is usually mosaicked in a QR code, read by a proprietary scanner, and linked to a government registry. Led by New York, California, and Louisiana, as many as 30 states are rolling them out. The Biden administration announced last spring that it would wrangle them under national standards but so far it hasn't. Internationally, the EU and a growing number of countries are adopting them, from repressive regimes like Bahrain to democracies like Denmark. Twenty U.S. states have banned the passes, and hashtags like #NoVaccinePassports are proliferating on both sides of the Atlantic. "Spoiler alert," tweeted British DJ ... Lange. "They are not planning on removing vax passports once introduced. This is just the first step to get you conditioned to accepting government restrictions in your daily life via your mobile phone. This digital ID is going to expand to all aspects of your life." Evidence supports the detractors' suspicions. Every government introducing a vaccine certification vows that their use is voluntary and no personal information will be held beyond its necessity. But governments are far from unanimous even on such basics as ... how long and by whom our intimate information will be held, owned, or overseen. New York, for one, is not expecting to mothball the technology when Covid wanes.