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The EU vaccination certificate (which is shown as a QR code in e.g. restaurants or public events) is twice longer than your example (572 characters for me), but
by PeterisP 5y ago
The EU vaccination certificate (which is shown as a QR code in e.g. restaurants or public events) is twice longer than your example (572 characters for me), but it includes all the data and a digital signature to allow offline verification of whether that certificate is valid.