Saputra, Heru, Bebby Ilham Aresta, Tri A Sundara, Ilfa Stephane, and Lakry Maltaf. 2021. “Blockchain-Based Diploma Information System Development”. INVOTEK: Jurnal Inovasi Vokasional Dan Teknologi 21 (1):37-44. https://doi.org/10.24036/invotek.v21i1.833.