The person verifying the certificate can read the data from a machine-readable QR code with the verification application. The data content of the QR code has been signed with a digital ECDSA signature for ensuring the integrity of the data.
What data does a machine-readable code include?
The machine-readable QR code of the EU COVID-19 certificates includes
- personal data
- content data of the certificate
With personal data, the certificate can be linked to the person presenting it. The content data of the certificate is data related to certificate of COVID-19 vaccination, the test certificate or the certificate of recovery. The metadata is for the purpose of implementing the verification process of the data content and the technical identification of the certificate.
More detailed information about the use and data contents of COVID-19 certificates is available through the links of the European Union and THL and from the technical specification documents maintained by the European Commission.
Technical specification for verifying the data of the EU COVID-19 certificate
The EU has implemented the specifications for the EU COVID-19 certificates in cooperation with the member countries. The specification documentation is available on the website of the EU Commission. The documents specify the data contents of the COVID certificates, the data verification processes and the technical specifications for creating and reading the data.
The specification documentation is in English.
In addition to the specifications, the GitHub service also includes example implementations of applications needed for issuing and verifying the COVID-19 certificates.
- EU digital green certificates (gifthub.com)
- European eHealth network ‒ digital COVID certificate coordination (gifthub.com)
The previously used national COVID-19 vaccination certificate is not compatible with the verification process of the COVID-19 certificate in accordance with the EU specifications. You can update your own national COVID-19 vaccination certificate to the EU COVID-19 certificate in My Kanta Pages.
The specifications related to the processing of COVID-19 vaccination certificates in the patient data systems are available on the kanta.fi website: