This does a witness
After the bride and groom sign first, the witnesses called in turn or per 2 by the Babs.
In the marriage certificate, both the left and right sheets must be signed. The reason for this is because one copy is kept in the vault of the municipality where the certificate was made. The other part is stored in a secret repository. This is also done with birth and death certificates.
After the wedding certificate is signed, the Babs indicates whether you can stay with the bride and groom or sit back on your chair. Your job (for now) is done !