A Swedish company has developed a microchip that can be implanted under the skin and act as a vaccine passport that can be read by cellphones.
But conspiracy theorists can settle down - the company says it's totally reversible if you change your mind.
"Implants are a very versatile technology that can be used for many different things," spokesperson Hannes Sjöblad said in a video posted by South China Morning Post earlier this week.
"Right now it's very convenient to have a COVID passport always accessible on your implant."
Vaccine passports have been rolled out by a number of countries around the globe, to encourage people to get vaccinated against COVID-19 and stop the spread the virus by limiting movement of those most likely to carry it - the unvaccinated.
Epicenter reportedly has implanted chips in some of its staff members so they don't have to use swipe cards around the office, for example.
The first person to have a microchip implanted was British scientist Kevin Warwick. In the past two decades they've become a common theme in conspiracy theories, often falsely linked to Microsoft founder and philanthropist Bill Gates and 5G cellphone networks.
"I can hear my grandma now 'mark of the beast'," one person tweeted in response to the Post's report. Many people urged Sweden to "read the room".
Chips are common in household pets, and for some - such as dogs - compulsory in New Zealand.