This action handles owner-specific update abilities for every entry. Namely, owners can transfer ownership of their entry or set it to resolve to another singleton. To do so, the owner singleton must create a puzzle-puzzle announcement with the contents of (sha256tree (c handle_hash (c new_owner_launcher_id new_resolved_data))).
This puzzle does not create a puzzle announcement, as the owner can be assured the update happens only if the message sent to the singleton is consumed.