Russian Steel Declaration - types of signatures allowed

Morning,
I work in import/export department and our company has incoming shipment to GB from US. Some of the items are under 73- commodity code meaning they require a declaration from the seller/supplier that the materials are not of Russian origin.
The declaration we received from supplier is written and signed(typed) in Microsoft Word. Is that type of signature allowed? Would a digital signature like DocuSign be allowed in this situation? What my company has to obtain from the supplier to assure import compliance on our part?
Kind regards,

Hi WLWalczak
You may need to contact national clearance hub to seek advice on this query. 
National Clearance Hub
Thank you