http://7xx2gr6z4xypbg3625lrhjaa7cyzhmz3ezzhe4el3x23p5h2ftyntwyd.onion
Each issuing body (e.g. a hospital, a test centre, a health authority) has its own digital signature key. All of these are stored in a secure database in each country. 4. The European Commission has built a gateway through which all certificate signatures can be verified across the EU.