Have you received an electronically signed document, but you are not sure whether the electronic signature is valid and equivalent to a handwritten signature? Check with the validator tool:

The service of validating qualified electronic signatures can only be provided by a provider of qualified trust services, who confirms the validity of the signature or stamp by the procedure of validating such electronic signature. Validator is a qualified trust service for validating electronic signatures and stamps for PDF and XML content. Verification is performed on the validation portal, in or via the API interface. The result of the verification is an electronically signed and time-stamped report on the verification result, which you receive in your secure electronic mailbox.