Implementasi Teknologi Blockchain Dengan Protokol Ethereum Pada Sistem E-Vote

Conventional electronic voting systems are vulnerable to manipulation and lack transparency, prompting this research to design and build a decentralized application (dApp) e-voting prototype to enhance election integrity using blockchain technology. This prototype was implemented using a hybrid architecture, combining a Solidity-based smart contract on the Ethereum network for voting logic (on-chain) with a PostgreSQL database for voter identity data (off-chain). The frontend application and backend API were built with Next.js, Ethers.js, and Knex.js, then deployed in a Google Cloud Platform environment. The test results demonstrated a fully functional dApp with distinct workflows for admins and voters, where the system successfully prevents double voting, enforces voter authorization, and maintains pseudo anonymity of data on the blockchain. The discussion concludes that the hybrid architecture is effective in balancing transparency and privacy, despite facing key challenges in state synchronization between on-chain and off-chain components and interoperability with external ecosystems, which were overcome through robust API design and meticulous deployment configuration.