Utomo, Andri Dwi, Jeffry, and Ahmad Irfandi. “Blockchain Model for Tracking Plastic Waste Using Smart Contracts to Reduce Emissions ”. Sinkron : jurnal dan penelitian teknik informatika 9, no. 4 (October 2, 2025): 1839-1849. Accessed May 19, 2026. https://jurnal.polgan.ac.id/index.php/sinkron/article/view/15245.