§1. After an ordination has taken place, the names of those ordained and of the ordaining minister and the place and date of the ordination are to be noted in a special register to be kept carefully in the curia of the place of ordination; all the documents of individual ordinations are to be preserved carefully.
§2. The ordaining bishop is to give to each of the ordained an authentic testimonial of the reception of ordination; if a bishop other than their own promoted them with dimissorial letters, they are to show the testimonial to their own ordinary for notation of the ordination in a special register to be kept in the archive.
Source: Code of Canon Law (Vatican.va)