Blockchain Application in the Waste Trading

Waste is a complex and severe problem with detrimental environmental impacts if not appropriately managed. The process of buying and selling waste is essential in waste management. With its smart contracts, blockchain allows transactions to be carried out automatically without involving third parties, thereby speeding up the process and increasing efficiency and security. This research applies blockchain to record waste buying and selling transactions. We selected Binance Smart Chain (BSC) as a blockchain platform and Solidity 0.8.0 to build smart contracts containing structures, events, and functions that manage transactions. Autotask connected to the relayer records transactions on the blockchain network without requiring direct intervention from the user. We set up credentials from apiKey and apiSecret to connect to OpenZeppelin Defender, then enter the contract address deployed to the BSC network. After that, we create a variable to accommodate the deployed smart contract's Application Binary Interface (ABI). System testing uses the black box and System Usability Scale (SUS). Of the ten test scenarios in the black box, everything ran smoothly. System testing using SUS resulted in a score of 76 and a Net Promoter Score (NPS) value of 70%. This score indicates that the system is deemed acceptable and included in the good category. This system can guarantee transparency in the waste buying and selling system, hoping to increase accountability and trust in the community.