Yes. An append-only log for the life of the account, with every release recording who released the contact and when.
RelationLens keeps an append-only log of every action for the life of the account. Entries are never edited after they are written.
Every delivered contact carries who released it and when, so a data subject request has an answer.
Every export can be re-downloaded for 24 months, so you can always show exactly what was sent. See RelationLens.