Absolutely!
If you would like the client to have full access, can make changes and requests to the proof directly, then you can go ahead and share the proof link. The proof itself is not labeled so the client will not know it's from us.
Or if you would like the client to only see the proof and not have full access you can provide them with a PDF. To download a PDF of the proof, simply move over the icons to the left hand side of the proof and you will find a download link to the PDF.