It can be verified whether the company is in Peppole?
Short answer
Yes, but three things need to be distinguished: Public search (Peppol Directory), TechnicalublIccurate in the network (looster/discovery) and the ability to accept a specific type of document you want to send to it. For the Slovak entity, the participant is the key identifier in the scheme 0245:tax identification number. The result should also be compared with its own master data (name, company registration number, tax identification number, VAT identification number, contracted entity) to sit on a particular business partner, not just on a technically found record.
A Public, Humanly Readable Search
Helps to find participants according to published data if they are publgood for first orientation, not final decision.
Technical verification in the network
Checks whether the participant's identifier is actually publforged and routable (OpenPeppol operates a separate Loopup Service).
Can he accept this kind of document?
Not every participant has to accept every type of document. It is not enough to find a company by the name of Þ to verify that it can accept the specific document you are sending it.
Check against reality
The result must sit on the right company registration number, tax identification number, VAT identification number and the business identity of the partner, not on a random similar record.
Conclusion
Not legal advice. Machine-translated answer, not yet manually reviewed. For the exact wording, see the Slovak original.