Are digitally signed affidavits valid in most jurisdictions?

I act as an intermediary in the PPE trade and I always make any suppliers wanting to connect with buyers via my organisation sign an affidavit digitally stating who they are and that they have the capacity to supply what any prospective buyers are looking for. As mentioned, this is signed digitally and I use SignRequest or DocuSign to get this done. The question is: are these affidavits valid? If not, how do I legitimise them as cheaply as possible?