I’m sure this is happening in the US, although I haven’t heard of anything.
The CDC vaccine “proof” is a .pdf you can download and print and fill out yourself.
One presecution of a doctor for selling fake vaxx cards in Cali... about a week ago.
“I’m sure this is happening in the US, although I haven’t heard of anything.”
If it isn’t it will. There will be no lack of buyers.
I laughed when I received my COVID card. There’s nothing secure about it. It’s just a bit of cardboard with your name and date/type of vaccination. There’s no micro-dots, no barcode, no identifying technology - it is a piece of thick paper.
I’ve no idea if this is different elsewhere.