A German Blood Certificate is a document that is used as proof of having specific German heritage. It is used to prove that a person has ancestors from Germany, or that a person is eligible to become a German citizen. The document includes information about the family’s history, such as the names and dates of birth of each family member, going back several generations. It also includes information about where in Germany each ancestor initially came from. A German Blood Certificate must be certified by a local or state government office in Germany.