I don't understand how the advantage of the DCO is that the receiving organization does not have to track it: it's a declaration of authenticity that can be use

I don't understand how the advantage of the DCO is that the receiving organization does not have to track it: it's a declaration of authenticity that can be used to pursue remedies in court in the even of fraud. Contributors would need to sign and submit and organizations would need to track it for each separate contribution. A DCO is a CLA as far as I can see except on a per-contribution basis instead of on a per-contributor basis.