I think your question is a little too vague. In general case DCnets provide perfect sender privacy (among participants, of course). If there are multiple mess

I think your question is a little too vague. In general case DCnets provide perfect sender privacy (among participants, of course). If there are multiple messages their senders will be completely unlinkable. Specific implementations might use schemes for collision resolution that break privacy, though there is no requirement that collisions (absent malicious participants) even be possible at all-- with fancy enough technology applied.