Socialization and Implementation of the North Sumatra Coffee Traceability System based on GPS and Blockchain in Mandailing Natal Regency, Research Team of State Polytechnic (Dr. Arfanda Anugrah Siregar, S.T, MT. Dr. Ismael, S.Kom, M.Kom, Dina Arfianti Siregar, S.E, M.Si, Marlya Fatira AK, S.E. M.Si, and Eli Safrida, S.E. M.Si) and Wilmar Indonesia Polytechnic (Amelia Haris Nasution, S.P, M.Si), the socialization was attended by the Head of the Madina Agriculture Office, PPL (Field Agricultural Extension Workers) and coffee farmers in Madina Regency, this activity was held on Wednesday, August 13, 2025 at the Madina Agriculture Office