Utomo, A.D. , Jeffry and Ahmad Irfandi 2025. Blockchain Model for Tracking Plastic Waste Using Smart Contracts to Reduce Emissions . Sinkron : jurnal dan penelitian teknik informatika. 9, 4 (Oct. 2025), 1839-1849. DOI:https://doi.org/10.33395/sinkron.v9i4.15245.