Bill Gates announced digital vaccine passports during a March 2020 TED Talk interview,

eventually what we’ll have to have is certificates of who’s a recovered person, who’s a vaccinated person” and “so eventually there will be this digital immunity proof that will help facilitate the global reopening up.”

This sentence on "digital immunity proof" was edited out by the TED Talk producers, but the sentence remained in a full audio version of the interview.

Such ‘vaccine passports’ are a key component of the biometric ID2020 project run by the “Digital Identity Alliance”, which was founded by Bill Gates – via Microsoft and GAVI – and the Rockefeller Foundation, which is itself linked to the ‘Known Traveler’ program initiated by the World Economic Forum.

The idea of using a pandemic to impose tighter top-down control, modeled after the Chinese ‘social credit’ system, was first described in a 2010 Rockefeller Foundation report (the so-called ‘lock step’ scenario).
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BILL GATES' FOUNDATION HELPED THE CHINESE GOVERNMENT IN VARIOUS WAYS, ACCORDING TO NEWLY-RELEASED BATCH OF NIAID EMAILS UNDER FAUCI
The newly-released emails include a September 5, 2017, report from Dr. Ping Chen, the NIAID representative in China.

Chen noted that the Gates Foundation "is working with the Chinese government" on medical outreach to other countries, specifically in Africa. She mentioned that the Gates Foundation has provided funding for China's National Medical Products Administration (formerly known as China's FDA), in order to place experienced Chinese-Americans who had worked at the U.S. FDA for many years to work in China's equivalent agency. 

The Gates Foundation spokesperson did not respond to concerns that the foundation's work bolsters the Chinese Communist government.
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https://www.foxbusiness.com/technology/gates-foundation-helped-raise-chinas-voice-of-governance-in-africa-newly-released-emails-show.amp