Europeans will be furnished with digital certificates that will be readable across the bloc sometime in June. The European Union ultimately wants to bridge its own certificates with those issued by the national authorities in partner countries such as the United States, but that goal could be far off.

For visitors from outside the European Union, the draft document of the rules says, “Member states should be able to accept third country certificates containing at least the minimum data set based on national law, taking into account the ability to verify the authenticity, validity and integrity of the certificate and whether it contains all relevant data.”

That, too, would give border authorities in each E.U. country leeway to accept or reject a vaccination certificate based on whether it looks authentic and contains the information needed.

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