Developer Certificates of Origin don't solve the problem of copyright termination after the death of the author. See (https://www.law.cornell.edu/uscode/text/17/203). You can attest the origin but your estate retains the right to terminate the usage rights after your death.
Does this apply even even when it's an otherwise irrevocable license?
I don't think that would matter; you'd have to ask a software licensing lawyer for a definitive answer.