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@jwz ("j͕̠̦̪͕̓͛̊̾̄ͅw̧̧̳̪̘͊̋͗̾͢͠z̢̘̞͈̺̞̩̓̽̐̋͗̆̋̚͟͜") replied to a tweet by @bradfitz:
@bradfitz If that's a SMART Health QR code, it reveals your birth date, and the date, location, and brand of the shots administered. I think that's all.