You can check the validity of a digital signature using for this the platform @firma.
Maximum file size supported (8 MBs)
Note: The verificable certificates must be among those accepted by the Ministerio de Industria Turismo y Comercio of Spain. Please refer to the complete list of accepted certificates
Certificates admitted by the platform @firma.
If your signature does not validate properly, because it indicates certified no supported, but his certificate if it finds between the collected
Web page of Ministerio de Industria, Turismo y Comercio
we advise you to get in touch with the support helpdesk.